Exhibit 99.1

FIRST MIDWEST BANCORP, INC. ANNOUNCES 2013

FIRST QUARTER RESULTS

Significant Earnings Growth - Lower Credit Costs

Higher Total Revenues - Strong Capital

ITASCA, IL, April 24, 2013 — Today, First Midwest Bancorp, Inc. (the “Company” or “First Midwest”) (NASDAQ NGS: FMBI), the holding company of First Midwest Bank (the “Bank”), reported results of operations and financial condition for the first quarter of 2013. Net income applicable to common shares for the first quarter of 2013 was $14.4 million, or $0.20 per share. This compares to $13.0 million, or $0.18 per share, for the fourth quarter of 2012 and $7.8 million, or $0.11 per share, for the first quarter of 2012.

“Performance for the quarter benefited from significant improvement in our credit risk profile and solid line of business momentum,” said Michael L. Scudder, President and Chief Executive Officer of First Midwest Bancorp, Inc. “As expected, our wealth management and mortgage sales teams continue to drive stronger revenue growth and serve as an important offset to the revenue headwinds created by the current low interest rate environment. Loan balances remained steady, reflecting both historical seasonality and solid, disciplined growth in corporate lending.”

Mr. Scudder concluded, “As we look ahead, low interest rates and evolving regulatory expectations will continue to present performance challenges for our industry. At the same time, our strong capital base and improved earnings profile leave us well positioned to navigate these headwinds, pursue opportunities for growth, and return value to our shareholders.”

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SELECT HIGHLIGHTS

Growing Earnings

·                  Earnings per share improved to $0.20, up 82% from the first quarter of 2012 and 11% from the fourth quarter of 2012.

·                  Total loans remained stable at $5.2 billion compared to December 31, 2012 with annualized C&I growth of 7% largely offset by mortgage loan sales.

·                  Year-over-year, total loans increased 4% after adjusting for the 2012 bulk loan sales.

·                  Operating revenues increased to $26.5 million, up 11% from the first quarter of 2012, reflecting strong growth in mortgage banking income and wealth management fees.

·                  Noninterest expense totaled $63.8 million, excluding severance-related costs of $1.0 million, up 2% from the first quarter of 2012.

Improving Credit and Strengthening Capital

·                  Net loan charge-offs, excluding covered loan charge-offs, totaled $6.8 million, down from $21.1 million for the first quarter of 2012 and consistent with the fourth quarter of 2012.

·                  Non-performing assets decreased 41% to $143.5 million compared to March 31, 2012 and were stable compared to December 31, 2012.

·                  Performing potential problem loans declined to 3.9% of total loans, down 43% and 7% from March 31, 2012 and December 31, 2012, respectively.

·                  Tier 1 common capital to risk-weighted assets remained strong at 9.62% as of March 31, 2013, a 29 basis point improvement from December 31, 2012.

OPERATING PERFORMANCE

Operating Performance Highlights

(Dollar amounts in thousands)

(1)         Comprised of demand deposits and interest-bearing transactional accounts.

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Pre-Tax, Pre-Provision Operating Earnings (1)

(Dollar amounts in thousands)

(1)         The Company’s accounting and reporting policies conform to U.S. generally accepted accounting principles (“GAAP”) and general practices within the banking industry. As a supplement to GAAP, the Company provided this non-GAAP performance result, which the Company believes is useful because it assists investors in evaluating the Company’s operating performance. This non-GAAP financial measure should not be considered an alternative to GAAP.

Pre-tax, pre-provision operating earnings of $29.1 million for the first quarter of 2013 increased 2.0% and 3.1% from the first and fourth quarters of 2012, respectively. Compared to the quarter ended March 31, 2012, the increase resulted primarily from growth in mortgage banking income and wealth management fees, which more than offset the decline in net interest income.

For the quarter ended December 31, 2012, the increase in pre-tax, pre-provision operating earnings resulted from a reduction in noninterest expense, primarily from lower loan remediation costs and personnel recruitment expenses, which was offset by the decrease in net interest income and noninterest income.

Further discussion of net interest income and noninterest income and expense is presented in later sections of this release.

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Net Interest Income and Margin Analysis

(Dollar amounts in thousands)

For the first quarter of 2013, average interest-earning assets increased $104.8 million from the first quarter of 2012 and declined $40.6 million from the fourth quarter of 2012. Compared to the first quarter of 2012, growth in the loan portfolio, primarily in the commercial and industrial (“C&I”), agricultural, and 1-4 family categories, was offset by the disposal of $172.5 million of original carrying value of certain non-performing and performing potential problem loans through bulk loan sales (“the bulk loan sales”) completed during the fourth quarter of 2012. This loan growth, coupled with the rise in investment securities and other interest-earning assets, more than mitigated the decrease in covered interest-earning assets.

The decrease in average interest-earning assets from the fourth quarter of 2012 was partially driven by a reduction in loans held-for-sale and the sale of $41.9 million of mortgage loans outstanding at December 31, 2012. This decline was mitigated by the reinvestment of excess cash into the investment securities portfolio.

Average funding sources for the first quarter of 2013 were up $136.9 million from the first quarter of 2012 and were $91.0 million lower than the fourth quarter of 2012. For the first quarter of 2013 compared to the prior year period, growth in demand deposits more than offset the slight decline in interest-bearing liabilities. Compared to the fourth quarter of 2012, declines in time deposits and demand deposits primarily contributed to the variance.

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Tax-equivalent net interest margin for the current quarter was 3.77%, declining 7 basis points compared to the fourth quarter of 2012 and 11 basis points from the first quarter of 2012. These decreases were driven by the continued repricing of maturing investment securities and loans at lower interest rates, which was mitigated by a reduction in rates paid on retail time deposits.

Interest earned on covered assets is generally recognized through the accretion of the discount on expected future cash flows. The change in the yield on covered interest-earning assets from the first quarter of 2012 was driven by revised estimates of future cash flows and the impact of adjusted amortization of the FDIC indemnification asset. The decline in yield from the fourth quarter of 2012 resulted from early pay-offs, downgrades of certain covered loans to non-accrual status, and transfers to OREO during the first quarter of 2013.

Noninterest Income Analysis

(Dollar amounts in thousands)

N/M — Not meaningful.

Total noninterest income for the first quarter of 2013 increased 11.7% compared to the first quarter of 2012 and declined 14.1% compared to the fourth quarter of 2012. Excluding the $5.2 million gain on the bulk loan sales during the fourth quarter of 2012, noninterest income increased 2.4% from the prior quarter.

Compared to the first quarter of 2012, total operating revenues increased 10.7%, attributed mainly to a rise in wealth management fees, gains on the sale of $54.0 million of mortgage loans, and fee income generated from interest rate derivative transactions.

Total operating revenues for the first quarter of 2013 declined 3.7% compared to the fourth quarter of 2012, resulting from a decrease in card-based fees and seasonally lower volumes of non-sufficient funds fees, service charges on business accounts, and merchant servicing fees.

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Noninterest Expense Analysis

(Dollar amounts in thousands)

N/M — Not meaningful.

Total noninterest expense for the first quarter of 2013 increased 3.5% compared to the first quarter of 2012 and declined by 11.9% compared to the fourth quarter of 2012. Excluding severance-related costs recorded in the first quarter of 2013, noninterest expense increased 2.5% from the first quarter of 2012.

First quarter 2013 salaries and wages increased from both prior periods presented due to severance expense of $811,000, along with annual merit increases and an increase in incentive compensation, which was slightly offset by a decrease in deferred salaries.

Retirement and other employee benefits increased compared to both prior periods from higher pension expense. A rise in FICA taxes also contributed to the variance compared to December 31, 2012.

The linked-quarter increase in OREO expenses resulted primarily from losses on sales of OREO properties in the first quarter of 2013 compared to gains on sales during the fourth quarter of 2012. This increase was partially offset by a reduction in real estate tax expense for the first three months of 2013.

Fourth quarter 2012 loan remediation costs were elevated due to expenses of $2.5 million related to the bulk loan sales and higher real estate taxes paid to preserve the Company’s rights to collateral associated with problem loans. Compared to the

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first quarter of 2012, loan remediation costs decreased 23.3%. Improved credit quality driven by management’s accelerated credit remediation actions in the third and fourth quarters of 2012 resulted in lower legal expenses and appraisal costs related to performing potential problem loans. In addition, the positive variance was also impacted by lower servicing costs for our covered loan portfolio.

Other professional services decreased compared to the fourth quarter of 2012 due primarily to a reduction in personnel recruitment expenses and a decline in legal fees.

Technology and related costs for the fourth quarter of 2012 were elevated from conversion expenses related to the integration of a bank acquired during the third quarter of 2012 in an FDIC-assisted transaction.

Adjusted amortization of the FDIC indemnification asset results from changes in the timing and amount of future cash flows expected to be received from the FDIC under loss sharing agreements based on management’s periodic estimates of future cash flows on covered loans.

For the fourth quarter of 2012, other expenses were elevated from a $1.3 million valuation adjustment on a former banking office transferred to OREO. In addition, other expenses declined compared to both prior periods presented due to a $500,000 reduction in the reserve for unfunded commitments during the first quarter of 2013.

LOAN PORTFOLIO AND ASSET QUALITY

Loan Portfolio Composition

(Dollar amounts in thousands)

Total loans, excluding covered loans, of $5.2 billion remained stable compared to December 31, 2012. The Company experienced annualized growth of 7.0% in C&I loans, 9.5% in agricultural lending, and 17.7% in multi-family loans from December 31, 2012, which was offset by declines in the residential construction and other commercial real estate portfolios.

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During the first quarter of 2013, $41.9 million of mortgage loans outstanding at December 31, 2012 were sold, which contributed to the decrease in the consumer portfolio. We continue to generate solid new mortgage volume, reflecting the expansion of our mortgage lending sales force that began in the second quarter of 2012.

Compared to March 31, 2012, total loans, excluding covered loans, increased 4.1% after adjusting for the 2012 bulk loan sales. In addition to growth in C&I loans and agricultural lending, the year-over-year increase was impacted by a rise in the 1-4 family portfolio from loans acquired in an FDIC-assisted transaction during the third quarter of 2012 and from new volume due to focused origination efforts.

Compared to both prior periods presented, strong growth in the C&I, agricultural, retail, and multi-family loan categories benefitted from our targeted portfolio distribution efforts. In addition, sales personnel have been focused on expansion into specialized lending areas, such as agribusiness and asset-based lending, which contributed to the increases.

Asset Quality

(Dollar amounts in thousands)

N/M — Not meaningful.

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Non-performing assets, excluding covered loans and covered OREO, were $143.5 million at March 31, 2013, decreasing $101.0 million, or 41.3%, from March 31, 2012. Compared to March 31, 2012, the significant decline in non-performing assets and potential problem loans resulted from management’s accelerated credit remediation activities, including the bulk loan sales during the fourth quarter of 2012.

Non-accrual loans increased $10.9 million from December 31, 2012, primarily from the transfer of five credit relationships to non-accrual during the first quarter of 2013. Total potential problem loans declined 6.9% compared to December 31, 2012, with improvement across the majority of corporate loan categories.

Charge-Off Data

(Dollar amounts in thousands)

Net loan charge-offs for the first quarter of 2013 were $7.6 million, decreasing 64.8% from the first quarter of 2012 and 2.5% from the fourth quarter of 2012. The decline in charge-offs compared to the first quarter of 2012 reflected improved credit quality due to management’s accelerated credit remediation actions, including the bulk loan sales.

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CAPITAL MANAGEMENT

Capital Ratios

(Dollar amounts in thousands)

The Company’s regulatory ratios exceeded all regulatory mandated ratios for characterization as “well-capitalized” as of March 31, 2013. The Board of Directors reviews the Company’s capital plan each quarter, giving consideration to the current and expected operating environment as well as an evaluation of various capital alternatives.

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About the Company

First Midwest is the premier relationship-based banking franchise in the dynamic Chicagoland banking market. As one of the Chicago metropolitan area’s largest independent bank holding companies, First Midwest provides the full range of business and retail banking and wealth management services through approximately 95 offices located in communities in metropolitan Chicago, northwest Indiana, central and western Illinois, and eastern Iowa. First Midwest has been recognized by the Chicago Tribune as one of Chicago’s Top Workplaces for the third consecutive year by being named a National Standard Top Workplace. Additionally, Forbes has recognized First Midwest as one of America’s Most Trustworthy Companies for 2012.

Safe Harbor Statement

This press release may contain “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements are not historical facts but instead represent only the Company’s beliefs regarding future events, many of which, by their nature, are inherently uncertain and outside of the Company’s control. It is possible that actual results and the Company’s financial condition may differ, possibly materially, from the anticipated results and financial condition indicated in these forward-looking statements. For a discussion of some of the risks and important factors that could affect the Company’s future results, see “Risk Factors” in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012 and other reports filed with the Securities and Exchange Commission. Forward-looking statements represent management’s best judgment as of the date hereof based on currently available information. The Company undertakes no duty to update any forward-looking statements contained in this press release after the date hereof.

Conference Call

A conference call to discuss the Company’s results, outlook, and related matters will be held on Wednesday, April 24, 2013 at 10:00 AM (ET). Members of the public who would like to listen to the conference call should dial (888) 317-6016 (U.S. domestic) or (412) 317-6016 (international) and ask for the First Midwest Bancorp, Inc. Earnings Conference Call. The number should be dialed 10 to 15 minutes prior to the start of the conference call. There is no charge to access the call. The conference call will also be accessible as an audio webcast through the Investor Relations section of the Company’s website, www.firstmidwest.com/investorrelations. For those unable to listen to the live broadcast, a replay will be available on the Company’s website or by dialing (877) 344-7529 (U.S. domestic) or (412) 317-0088 (international) conference I.D. 10027318 beginning one hour after completion of the live call until 9:00 A.M. (ET) on May 1, 2013. Please direct any questions regarding obtaining access to the conference call to First Midwest Bancorp, Inc. Investor Relations, via e-mail, at investor.relations@firstmidwest.com.

Accompanying Financial Statements and Tables

Accompanying this press release is the following unaudited financial information:

·                  Condensed Consolidated Statements of Financial Condition