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See Notes to Condensed Consolidated Financial Statements

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The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles in the United States for complete annual financial statements. In the opinion of management, all adjustments consisting of normal recurring accruals considered necessary for a fair presentation have been included. Operating results for the three and nine-month periods ended September 30, 2004 are not necessarily indicative of the results that may be expected for the year ending December 31, 2004. The condensed consolidated balance sheet as of December 31, 2003, has been extracted from the audited financial statements included in S&T's 2003 Annual Report to Shareholders. For further information, refer to the consolidated financial statements and footnotes thereto included in the annual report on Form 10-K for the year ended December 31, 2003.

Basic earnings per share is calculated by dividing income available to common shareholders by the weighted average number of common shares outstanding during the period. Options, warrants and other potentially dilutive securities are excluded from the basic calculation, but are included in computing diluted earnings per share.

NOTE B - STOCK-BASED COMPENSATION

S&T accounts for stock options using the intrinsic value method. The following proforma information regarding net income and earnings per share assumes stock options had been accounted for under the fair value method and the estimated fair value of the options was amortized to expense over the vesting period. Compensation expense, net of related tax, of $248,000 and $81,000 for the three months ended, and $743,000 and $243,000 for the nine months ended September 30, 2004 and 2003, is included in the proforma net income as reported below.

The fair value was estimated at the grant dates using a Black-Scholes option pricing model with the following assumptions at September 30, 2004 and September 30, 2003, respectively: risk-free interest rates of 3.27% and 3.03%; a dividend yield of 3.30% and 3.60%; volatility of the expected market price of S&T's common stock of .266 and .275; and a weighted-average expected life of five years.

The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options that have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. S&T's employee stock options have characteristics significantly different from those of traded options, and changes in the subjective input assumptions can materially affect the fair value estimate.

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NOTE C - RECENT ACCOUNTING PRONOUNCEMENTS

On October 13, 2004, the Financial Accounting Standards Board (FASB) concluded that Statement No. 123R, "Share Based Payment", which will require all companies to measure compensation costs for all share-based payments (including employee stock options) at fair value, would be effective for interim or annual periods beginning after June 15, 2005. Retroactive application of the requirements of Statement No. 123 (not Statement No. 123R) to the beginning of the fiscal year that includes the effective date would be permitted, but not required. Early adoption of Statement No. 123R is encouraged. S&T will be required to apply Statement No. 123R beginning July 1, 2005 in its consolidated financial statements for the quarter ending September 30, 2005. S&T is currently assessing the impact of this pending guidance, but it does not expect the adoption to have a material effect on S&T's consolidated financial statements, based on the current level of stock options granted.

In March 2004, the Emerging Issues Task Force (EITF), revised EITF No. 03-1, "The Meaning of Other than Temporary Impairment and its Application to Certain Investments." In the revised guidance, the EITF reached a consensus regarding the model to be used in determining whether an investment is other-than-temporarily impaired, and the required disclosures about unrealized losses on available-for-sale debt and equity securities. The other-than-temporary impairment evaluation guidance was effective for S&T on July 1, 2004. The additional annual disclosures prescribed by this guidance are required for S&T beginning with the year ending December 31, 2004.

In September 2004, the Financial Accounting Standards Board (FASB) issued two draft Financial Statement Positions (FSPs), one deferring the effective date for a portion of EITF 03-1, (The Meaning of Other Than Temporary Impairment,) and the other providing implementation guidance. Both draft FSPs only relate to debt securities under paragraph 16 of EITF 03-1with impairments that are solely due to interest rate changes, including changes in interest rates due to increases in sector credit spreads. Paragraph 16 is applicable to debt that cannot be contractually prepaid or otherwise settled such that the investor would not recover substantially all of its cost.

NOTE D - GOODWILL AND OTHER INTANGIBLES

S&T's balance sheet includes both tangible assets (such as loans, buildings, and investments) and intangible assets (such as goodwill and core deposit intangibles). Goodwill is periodically reviewed for impairment. Other intangibles are comprised of core deposit intangibles and other mortgage servicing assets, which are also reviewed for impairment on a periodic basis.

NOTE E - EMPLOYEE BENEFITS

The following table summarizes the components of net periodic pension expense for S&T's defined benefit plan:

S&T previously disclosed in its financial statements for the year ended December 31, 2003, that it expected to contribute $3.0 million to its pension plan in 2004. As of September 30, 2004, $3.0 million of contributions have been made. No further contributions are expected to be made during 2004.

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S&T BANCORP INC. AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
NOTE F - SECURITIES - continued

The amortized cost and estimated market value of debt securities at September 30, 2004, by contractual maturity, are as set forth below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been allocated over maturity groupings based upon the current estimated prepayment rates. The mortgage-backed securities may mature earlier or later than their weighted-average estimated maturities because of principal prepayments.

At September 30, 2004 and December 31, 2003, investment securities with a principal amount of $336,695,000 and $389,922,000, respectively, were pledged to secure repurchase agreements, public funds and trust fund deposits.

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S&T BANCORP INC. AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
NOTE G - LOANS AND ALLOWANCE FOR LOAN LOSSES - continued

The following table represents S&T's investment in loans considered to be impaired and related information on those impaired loans as of September 30, 2004 and December 31, 2003.

S&T, in the normal course of business, commits to extend credit and issue standby letters of credit. The obligations are not recorded in S&T's financial statements. Loan commitments and standby letters of credit are subject to S&T's normal credit underwriting policies and procedures and generally require collateral based upon management's evaluation of each customer's financial condition and ability to satisfy completely the terms of the agreement. S&T's exposure to credit loss in the event the customer does not satisfy the terms of the agreement equals the notional amount of the obligation less the value of any collateral. Unfunded commercial loan commitments totaled $530,093,000, unfunded other loan commitments totaled $133,373,000 and obligations under standby letters of credit totaled $185,237,000 at September 30, 2004.

NOTE I - LITIGATION

S&T, in the normal course of business, is subject to various legal proceedings in which claims for monetary damages are asserted. Management does not believe that the outcome of any current proceedings will have a material adverse effect on the consolidated financial position of S&T.

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The following discussion and analysis is presented so that shareholders may review in further detail the financial condition and results of operations of S&T Bancorp, Inc. and subsidiaries ("S&T"). This discussion and analysis should be read in conjunction with the condensed consolidated financial statements and the financial data presented elsewhere in this report.

Business Summary

S&T is a financial holding company with its headquarters located in Indiana, Pennsylvania with assets of $3.0 billion at September 30, 2004. S&T provides a full range of financial services through a branch network of 49 offices located in Allegheny, Armstrong, Blair, Butler, Cambria, Clarion, Clearfield, Indiana, Jefferson and Westmoreland counties of Pennsylvania. S&T provides full service retail and commercial banking products as well as cash management services; insurance; estate planning and administration; employee benefit investment management and administration; corporate trust services and other fiduciary services.

Financial Condition

Total assets averaged $3.0 billion in the first nine months of 2004. Average loans increased $170.5 million and average securities and federal funds decreased $60.3 million in the first nine months of 2004 compared to the 2003 full year average. Average deposits increased $70.0 million and average borrowings increased $29.8 million during the nine months ended September 30, 2004 as compared to the 2003 full year average.

Lending Activity

Average loans increased $170.5 million to $2.2 billion during the nine months ended September 30, 2004 from the 2003 full year average. Changes in the composition of the average loan portfolio during the first nine months of 2004 included increases of $60.7 million of commercial loans and $146.9 million of commercial real estate loans, offset by decreases of $24.5 million of residential mortgages and $12.6 million of installment loans.

Real estate construction and commercial loans, including mortgage and industrial, comprised 75% of the average loan portfolio as of September 30, 2004. Although commercial loans can be an area of higher risk, management believes these risks are mitigated by limiting concentrations and a rigorous underwriting review by loan administration.

Residential mortgage loans comprised 22% of the average loan portfolio as of September 30, 2004. Residential mortgage lending continued to be a strategic focus for the third quarter of 2004 through our centralized mortgage origination department, product redesign, secondary market activities and the utilization of commission compensated originators. Management believes that S&T is fairly well insulated from the impact of potential future declines in its local real estate market due to its conservative mortgage lending policies. These policies generally require, for portfolio loans, a maximum term of twenty years for fixed rate mortgages and private mortgage insurance for loans with less than a 20% down payment. At September 30, 2004, 13% of the residential mortgage portfolio consisted of adjustable rate mortgages.

S&T periodically sells longer-term, lower-yielding 1-4 family mortgages to Fannie Mae. The rationale for these sales is to mitigate interest rate risk associated with holding long-term residential mortgages in the loan portfolio, to generate fee revenue from servicing, and still maintain the primary customer relationship. During the first nine months of 2004, S&T sold $33.7 million of 1-4 family mortgages to Fannie Mae compared to $64.6 million during the first nine months of 2003. S&T will continue to sell longer-term loans to Fannie Mae in the future on a selective basis, especially during periods of lower interest rates.

Consumer installment loans comprised 3% of the average loan portfolio as of September 30, 2004. Direct auto loans decreased $5.6 million for the nine months ended September 30, 2004 as compared to the 2003 full year average.

Loan underwriting standards for S&T are established by a formal policy administered by the S&T Bank Credit Administration Department and are subject to the periodic review and approval of the S&T Bank Board of Directors. Rates and terms for commercial real estate and equipment loans normally are negotiated, subject to such variables as economic conditions, marketability of collateral, credit history of the borrower and future cash flows. The loan to value policy guideline for commercial real estate loans is generally 75-80%.

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The loan to value policy guideline is 80% for residential first lien mortgages. Higher loan to value loans may be approved with the appropriate private mortgage insurance coverage. Second lien positions are sometimes incurred with home equity loans, but normally only to the extent that the combined credit exposure for both the first and second liens does not exceed 100% of loan to value. S&T offers a variety of unsecured and secured installment loan and credit card products. However, the majority of the consumer loan portfolio is automobile loans. Loan to value guidelines for direct loans are 90%-100% of invoice for new automobiles and 80%-90% of National Automobile Dealer Association (NADA) value for used automobiles.

Management intends to continue to pursue quality loans in a variety of lending categories within our market area in order to enhance shareholder value. S&T's loan portfolio primarily represents loans to businesses and consumers in our market area of western Pennsylvania rather than to borrowers in other areas of the country. S&T has not concentrated its lending activities in any industry or group of industries. During the past several years, management has concentrated on building an effective credit and loan administration staff, which assists management in evaluating loans before they are made and in identifying problem loans early.

Security Activity

Average securities decreased by $60.5 million in the first nine months of 2004 compared to the 2003 full year average to partially provide funding for the commercial loan growth. The average decrease was comprised of $27.8 million in U.S. government agency securities, $26.3 million of mortgage-backed securities and $12.5 million of other corporate securities. Offsetting these decreases were average increases of $12.0 million of states and political subdivisions and $1.7 million of Federal Home Loan Bank (FHLB) stock. The equity securities portfolio is primarily comprised of bank holding companies to take advantage of the dividends received deduction for corporations. At September 30, 2004, the equity portfolio had net unrealized gains of $24.8 million. The equity securities portfolio consists of securities traded on the various stock markets and are subject to changes in market value. The FHLB capital stock is a membership and borrowing requirement and is acquired and sold at stated value.

S&T's policy for security classification includes U.S. treasuries, U.S. government agencies, mortgage-backed securities, collateralized mortgage obligations, municipal securities, corporate securities and marketable equity securities as available for sale. One municipal security is classified as held to maturity. On a quarterly basis, management evaluates the security portfolios for other than temporary declines in fair value. At September 30, 2004 unrealized gains, net of unrealized losses, for securities classified as available for sale were $30.7 million.

The balance in the allowance for loan losses was $32.1 million or 1.40% of total loans at September 30, 2004 as compared to $31.5 million or 1.50% of total loans at December 31, 2003. The adequacy of the allowance for loan losses is determined by management through evaluation of the loss potential on individual nonperforming, delinquent and high-dollar loans; review of economic conditions and business trends; historical loss experience; and growth and composition of the loan portfolio, as well as other relevant factors.

A quantitative and qualitative analysis is utilized to support the adequacy of the allowance for loan losses. This analysis includes review of the high and average historical loss rates by loan categories, fluctuations and trends in the amount of impaired and classified loans and economic factors. Economic factors consider the level of S&T's historical losses that have occurred within the credits' economic life cycle, as well as inherent imprecision in the evaluation process.

Significant to this analysis is the shift in the loan portfolio composition to an increased mix of commercial loans. These loans are generally larger in size and, due to our continuing growth, many are new loan relationships. Management relies on its risk rating process to monitor trends, which may be occurring relative to commercial loans to assess potential weaknesses within specific credits. Current economic factors and trends in risk ratings are considered in the determination of the allowance for loan losses. At September 30, 2004, S&T's risk rating analysis of the portfolio remains relatively stable compared to December 31, 2003.

Net loan charge-offs totaled $4.3 million in the first nine months of 2004 compared to $4.2 million in the first nine months of 2003. The balance of nonperforming loans, which included nonaccrual loans past due 90 days or more, at September 30, 2004, was $15.9 million or 0.69% of total loans. This compares to nonperforming loans of $9.1 million or 0.43% of total loans at December 31, 2003. The majority of the increase in nonperforming loans relates to a $7.7 million credit for a hotel. The borrower has experienced reduced cash flows associated with the declines in hotel occupancy and is within an industry that has suffered from pricing pressures, over-capacity and declining performance in recent years. The credit is secured by real estate

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and a personal guarantee of the principal, and the collateral is scheduled for auction in the fourth quarter of 2004. S&T's previous and continued exposure related to this relationship had been appropriately considered in determining the adequacy of the allowance for loan losses in prior periods. S&T recorded a $2.5 million charge-off in the third quarter of 2004 related to this credit and the remaining nonperforming balance was $5.2 million at September 30, 2004 The other significant component of nonperforming assets is another hotel that bears an 80 percent United States Department of Agriculture guarantee. The property has been sold, with no expected remaining exposure to S&T. In the fourth quarter of 2004, S&T expects to resolve this $2.5 million nonperforming asset.

Maintaining asset quality is a major corporate objective at S&T, and management believes that the allowance for loan losses is adequate to absorb probable loan losses. Nonperforming assets totaled $18.7 million or 0.62% of total assets at September 30, 2004, as compared to $14.0 million or 0.47% at June 30, 2004, and $11.5 million or 0.40% at December 31, 2003. The majority of the increase in nonperforming assets relates to a $7.7 million credit for a hotel, as discussed above.

Average total deposits increased by $70.0 million, or 4%, during the nine months ended September 30, 2004 as compared to the 2003 full year average. Changes in the average deposit mix included increases of $38.5 million in demand accounts, $6.0 million in savings accounts and $51.2 million in time deposits. Partially offsetting these increases is a decrease of $25.7 million in money market and NOW accounts. The change is attributable to strategic initiatives through new products, promotions and cash management services to commercial customers to increase transaction related deposits and a shift from money market accounts to time deposits and savings as increased interest rates became more attractive to depositors.

Management believes that the S&T deposit base is stable and that S&T has the ability to attract new deposits, mitigating a funding dependency on other more volatile sources. Time deposits of $100,000 and over were 9% of total deposits at September 30, 2004 and 8% at December 31, 2003, respectively, and primarily represent deposit relationships with local customers in our market area. In addition, S&T believes it has the ability to access both public and private capital markets to raise long-term funding if necessary. Periodically, S&T enters into brokered certificates of deposits with outside brokerage firms. There were $37.3 million of brokered retail certificates of deposits outstanding at September 30, 2004 and $8.8 million at December 31, 2003. The increase in brokered certificates of deposits was to partially provide funding for the commercial loan growth.

Borrowings

Average borrowings increased $29.8 million for the first nine months ended September 30, 2004 compared to the 2003 full year average and were comprised of retail repurchase agreements (REPOs), wholesale REPOs, federal funds purchased, Federal Home Loan Bank (FHLB) advances and long-term borrowings. S&T defines repurchase agreements with its local retail customers as retail REPOs; short-term wholesale REPOs are those transacted with other banks and brokerage firms with terms normally ranging from 1 to 365 days.

The average balance in retail REPOs increased approximately $11.5 million for the first nine months of 2004 compared to the full year 2003 average. S&T views retail REPOs as a relatively stable source of funds because most of these accounts are with local long-term customers. Average wholesale REPOs, federal funds purchased and FHLB advances increased by $137.1 million for the first nine months of 2004 compared to the full year 2003 average, in order to take advantage of low rate short-term funds and to better match commercial borrower shifts into more variable rate products.

Average long-term borrowings have decreased by $119.2 million in the first nine months of 2004 as compared to the full year 2003 average. At September 30, 2004, S&T had average long-term borrowings outstanding of $109.7 million. During the fourth quarter of 2003, S&T prepaid $89.3 million of fixed-rate borrowings, with average maturities of approximately nine months and an average cost of 6.56%. The funds were replaced with short-term borrowings having an average cost of 1.25%. The interest expense savings approximated $0.5 million in 2003 and $2.9 million in the first nine months of 2004. The reduction in higher-cost long-term debt was an asset/liability strategy intended to mitigate the asset sensitivity position of S&T's balance sheet and exposure to declining interest rates.

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Capital Resources

Shareholders' equity increased $5.9 million at September 30, 2004, compared to December 31, 2003. Net income was $39.8 million and dividends paid to shareholders were $20.9 million for the nine months ended September 30, 2004. Also affecting capital is a decrease of $6.9 million in unrealized gains on securities available for sale, stock buybacks of 542,600 shares during 2004 at an average cost of $29.43 per share and the issuance of 404,058 shares through the exercise of employee and director stock options. Authorization for repurchasing an additional 457,400 shares remains in effect for 2004.

S&T paid 53.3% of net income in dividends, equating to an projected annual dividend yield of 3% utilizing the September 30, 2004 closing market price of $35.71. The book value of S&T's common stock increased from $12.48 at December 31, 2003 to $12.77 at September 30, 2004. The market price of S&T's common stock was $35.71 per share at September 30, 2004, compared to $29.80 per share at December 31, 2003.

S&T continues to maintain a strong capital position with a leverage ratio of 9.2% as compared to the minimum regulatory guideline of 3.0%. S&T's risk-based capital Tier I and Total ratios were 10.4% and 12.1%, respectively, at September 30, 2004. These ratios place S&T above the Federal Reserve Board's risk-based capital guidelines of 4.0% and 8.0% for Tier I and Total, respectively.

RESULTS OF OPERATIONS

Net income was $39.8 million or $1.49 diluted earnings per share for the first nine months of 2004 as compared to $38.6 million or $1.45 diluted earnings per share for the same period of 2003. The increase during the first nine months of 2004 was primarily the result of increases in net interest income, higher security gains and lower loan loss provision, offset by an increase in noninterest expense.

Net Interest Income

Net interest income on a fully taxable equivalent basis increased $1.7 million or 2% for the nine months as compared to the same period of 2003. Net interest income for the first nine months of 2003 included $1.5 million of commercial loan prepayment penalties and dividends that did not recur this year. The net interest margin on a fully taxable equivalent basis was 3.97% in the first nine months of 2004 as compared to the 4.05% in the same period of 2003. Tax-exempt income on a fully-taxable equivalent basis using the statutory corporate income tax rate of 35% was $2.8 million for the nine months ended September 30, 2004 and 2003, respectively.

In the first nine months of 2004 average loans increased $179.9 million, and average securities and federal funds sold decreased $68.2 million as compared to the same period of 2003. The yields on average securities decreased by 32 basis points from the comparable period in 2003 and the yield on average loans decreased by 62 basis points.

In the first nine months of 2004 balances of average interest-bearing deposits increased by $27.3 million as compared to the same period of 2003. The cost of deposits totaled 1.84%, a decrease of 18 basis points from the comparable period in 2003 due to decreased rates paid on both core and time deposits. The cost of REPOs and other borrowed funds decreased 136 basis points to 1.70%.

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Positively affecting net interest income was a $58.0 million increase in average net free funds as compared to the nine months ended September 30, 2003. Average net free funds are the excess of demand deposits, other noninterest bearing liabilities and shareholders' equity over nonearning assets. During 2003, dividend income included the impact of special dividends and commercial loan prepayment penalties, which did not recur in 2004.

Maintaining consistent spreads between earning assets and interest-bearing liabilities is very significant to S&T's financial performance because net interest income comprised 79% of operating revenue (net interest income plus noninterest income, excluding security gains) in the first nine months of 2004. A variety of asset/liability management strategies were successfully implemented within prescribed Asset/Liability Committee risk parameters that enabled S&T to maintain a net interest margin reasonably consistent with historical levels during a volatile interest rate environment. The level and mix of funds are monitored by the Asset/Liability Committee in order to mitigate the interest rate sensitivity and liquidity risks of the balance sheet.

Provision for Loan Losses

The provision for loan losses was $4.9 million for the first nine months of 2004 and $5.8 million for the same period of 2003. The provision is the result of management's on-going assessment of economic conditions, credit quality statistics, loan administration effectiveness and other factors that would have an impact on probable losses in the loan portfolio. Also affecting the amount of provision is loan growth, portfolio composition and trends within risk ratings.

Credit quality indicators are important factors in determining the amount of the provision. Net charged-off loans were $4.3 million and $4.2 million for the first nine months of 2004 and 2003, respectively. Nonperforming loans to total loans was 0.69% at September 30, 2004 compared to 0.47% at September 30, 2003. The majority of the increase in nonperforming loans relates to a $7.7 million credit for a hotel. The borrower has experienced reduced cash flows associated with the declines in hotel occupancy and is within an industry that has suffered from pricing pressures, over-capacity and declining performance in recent years. The credit is secured by real estate and a personal guarantee of the principal, and the collateral is scheduled for auction in the fourth quarter of 2004. S&T's previous and continued exposure related to this relationship had been appropriately considered in determining the adequacy of the allowance for loan losses in prior periods. S&T recorded a $2.5 million charge-off in the third quarter of 2004 related to this credit and the remaining nonperforming balance was $5.2 million at September 30, 2004. Also affecting the amount of provision expense are the amount and types of loan growth, portfolio composition and specifically assigned reserve in prior periods for troubled credits. Loan growth in the first nine months of 2004 compared to 2003 is attributable to larger-sized commercial loans, which present an inherently higher risk than other types of loans in the portfolio.

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Noninterest income, excluding investment security gains, was relatively flat at $21.2 million for the nine-month period ended September 30, 2004, as compared to the year ago period. The primary reason for this performance was a $0.7 million decline in mortgage banking revenues primarily due to lower residential mortgage originations in 2004. Traditional fees from deposit services, insurance and wealth management increased $0.8 million or 6% year-to-date 2004 compared to 2003. Wealth management activities increased $0.5 million or 11% as a result of new business and general market improvements. The increase of $0.1 million or 2% in service charges and fees and $0.3 million or 8% in insurance is a result of several strategic initiatives and product enhancements that were implemented in order to expand these sources of revenue.

S&T recognized $4.4 million of gains on available for sale equity securities in the first nine months of 2004 as compared to $3.3 million in the same period of 2003. The increase is a result of better market opportunities for the equity securities portfolio during the first nine months of 2004. Unrealized gains, net of unrealized losses, in the available for sale equity portfolio totaled $24.8 million at September 30, 2004, compared to $30.5 million at December 31, 2003.

Noninterest expense increased by $1.6 million or 4% during the nine months ended September 30, 2004 compared to the nine months ended September 30, 2003. Staff expense increased $1.4 million or 6% primarily attributable to the effects of merit increases, higher benefit plan costs and increased staffing levels. Average full-time equivalent staff was 774 at September 30, 2004 and 765 at September 30, 2003. Data processing expense increased $0.3 million or 13% and other expense decreased $0.2 million or 2%. The changes with data processing and other expense are primarily related to the reclassification of certain communication costs from other expense as well as increased organizational growth related to increased business activity, particularly in the commercial lending and credit administration areas. S&T's efficiency ratio, which measures noninterest expense as a percent of noninterest income plus net interest income on a fully taxable equivalent basis, was 43% for the nine months ended September 30, 200 4 as compared to 42% for the nine months ended September 30, 2003.

Federal Income Taxes

Federal income tax expense increased $0.9 million for the nine months ended September 30, 2004 as compared to the same period of 2003. The effective tax rate for the first nine months of 2004 and 2003 was 29%, which is below the 35% statutory rate due primarily to benefits resulting from tax-exempt interest, excludable dividend income, low income housing tax credits and the defined contribution retirement plan dividend deduction.

Net income was $13.3 million or $0.50 per diluted earnings per share in the third quarter of 2004 and in the same period of 2003.

On a fully taxable equivalent basis, net interest income increased $1.7 million or 6% in the third quarter of 2004 compared to the same period of 2003. The increase in net interest income is a result of a $118.6 million increase of average interest earning assets primarily driven by increased commercial lending activity. Also, affecting the year-to-year comparison is $0.7 million of prepayment penalties received on commercial loans in 2003 that did not recur in the same period of 2004. Net interest margin on a fully taxable equivalent basis was 3.96% for the third quarter of 2004, as compared to 3.87% for the same period of 2003.

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In the third quarter of 2004, average loans increased $220.7 million, and average securities and average federal funds sold decreased $102.1 million as compared to the third quarter of 2003. The yields on average securities increased by 5 basis points from the comparable period in 2003 and the yield on average loans decreased by 24 basis points. Positively affecting net interest income was an increase of $46.4 million in net free funds as compared to the three months ended September 30, 2004.

In the third quarter of 2004, balances of average interest-bearing deposits increased by $75.5 million as compared to the same period of 2003. The cost of deposits totaled 1.87%, an increase of 5 basis points from the comparable period in 2003 due to increased rates paid on both core and time deposits. The cost of REPOs and other borrowed funds decreased 96 basis points to 1.93%.

Noninterest Income

Noninterest income, excluding security gains, decreased $1.3 million or 16% in the third quarter of 2004 as compared to 2003. Decreases included $1.6 million in other income, offset by increases of $0.2 million in insurance and $0.1 million in wealth management fees. During the third quarter of 2004, decreases in long and intermediate term interest rates increased the prepayment speeds in the $171.5 million serviced loan portfolio, resulting in an increase to the valuation allowance for residential mortgage servicing rights of $0.3 million, as compared to a $0.6 million reduction in the valuation allowance for the third quarter of 2003. Also affecting mortgage banking revenues in 2004 is the reduction of mortgage originations as compared to a period of heavy refinancing activity in 2003. S&T recognized $1.1 million of gains on available for sale securities in the third quarter of 2004 and in the same period of 2003. Included in realized equity security gains for the third quarter of 2004 is a $0.4 mi llion charge for an other than temporary impairment on one equity investment security. The equity

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security gains were taken on available for sale securities in the third quarter of 2004 and 2003 in order to maximize returns in the portfolio by taking advantage of market opportunities when presented.

Noninterest Expense

Noninterest expense increased $0.2 million or 1% in the third quarter of 2004 as compared to the third quarter of 2003. Staff expense increased $0.3 million or 4% primarily attributable to higher benefit plan costs and increased staffing levels. Included in this increase is an additional expense of $0.4 million for employee healthcare due to the impact of adverse claim experience in S&T's self-funded plan and overall medical cost inflation. Average full-time equivalent staff was 781 for the three months ended September 30, 2004 and 773 for the same period of 2003 reflecting increased business activity, particularly in the commercial lending and credit administration areas.

Federal Income Taxes

Federal income tax expense increased $0.2 million in the third quarter of 2004 as compared to the third quarter of 2003. The effective tax rate for the third quarter of 2004 and 2003 was 29% and 28%, respectively, which is below the 35% statutory rate due primarily to benefits resulting from tax-exempt interest, excludable dividend income, low income housing tax credits and the donation of appreciated equity securities in 2003.

S&T's consolidated financial statements are prepared based upon the application of certain critical accounting policies affecting accounts such as: investment securities, allowance for loan losses and goodwill and other intangibles. Certain of these policies require numerous estimates and strategic or economic assumptions that may prove inaccurate or subject to variations and may significantly affect S&T's reported results and financial position for the period or in future periods. Changes in underlying factors, assumptions or estimates in any of these areas could have a material impact on S&T's future financial condition and results of operations. S&T's critical accounting policies are presented in Management's Discussion and Analysis of Financial Condition and Results of Operations in S&T's Annual Report on Form 10-K, filed with the SEC on March 15, 2004. There have been no material changes in S&T's critical accounting policies since December 31, 2003.

The statements in this Quarterly Report, which are not historical fact, are forward looking statements that involve risks and uncertainties, including, but not limited to, the interest rate environment, the effect of federal and state banking and tax regulations, the effect of economic conditions, the impact of competitive products and pricings, and other risks detailed in S&T's Annual Report on Form 10-K, filed with the SEC on March 15, 2004, and other filings with the SEC. The statements made in this quarterly report are made as of the date of this quarterly report, and S&T undertakes no obligation to update any of the forward looking statements made herein, whether as a result of new information, future events, changes in expectations or otherwise.

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