Exhibit 99.1

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The following unaudited pro forma condensed combined statement of operations and other data give effect to:

as if, in the case of the balance sheet data, the merger occurred as of March 31, 2017 and, in the case of the statement of operations data for the three months ended March 31, 2017 and the year ended December 31, 2016, the merger and the issuance of the shares of Pinnacle’s common stock in the offering occurred as of January 1, 2016.

The unaudited pro forma condensed combined statement of earnings and other data for the three months ended March 31, 2017 and the year ended December 31, 2016 combines the historical consolidated results of operations of Pinnacle with the historical consolidated results of operations of BNC for such period giving effect to the transactions described above as if those transactions had been completed as of January 1, 2016. The unaudited pro forma condensed combined balance sheet data as of March 31, 2017 combines the historical consolidated balance sheet of Pinnacle as of that date with the historical consolidated balance sheet of BNC as of that date and gives effect to the merger described above as if the merger had been completed as of that date. Pinnacle will account for the merger under the purchase method of accounting.

The pro forma financial data appearing below is presented for illustrative purposes only, is based upon a number of assumptions and estimates and is subject to uncertainties, and that data does not purport to be indicative of the actual results of operations or financial condition that would have occurred had the transactions described above in fact occurred on the dates indicated, nor does it purport to be indicative of the results of operations or financial condition that the combined company may achieve in the future.

The pro forma condensed combined financial data appearing below also does not consider any potential effects of changes in market conditions on revenues or expense efficiencies, among other factors. In addition, as explained in more detail in the accompanying notes, the preliminary allocation of the pro forma purchase price reflected in the pro forma condensed combined financial data is subject to adjustment and may vary significantly from the actual purchase price allocation that will be recorded upon completion of the merger.

The unaudited pro forma condensed combined statement of operations data appearing below does not give pro forma effect to the following for any period prior to the applicable date the transaction was consummated:

The pro forma financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Pinnacle’s historical financial statements and the notes thereto, in each case as included in Pinnacle’s Annual Report on Form 10-K for the fiscal year ended

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December 31, 2016 and Pinnacle’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the historical financial statements of BNC and the notes thereto included in BNC’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016 and BNC’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017.

As noted above, the merger will be accounted for using the purchase method of accounting. The total purchase price will be allocated to the tangible and intangible assets and liabilities acquired based on their respective fair values. The allocation of the purchase price reflected in the following pro forma financial statements is preliminary and is subject to adjustment upon receipt of, among other things, appraisals of some of the assets and liabilities of BNC.

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Note 1—Basis of presentation

The pro forma condensed combined financial information and explanatory notes have been prepared to illustrate the effects of the merger under the acquisition method of accounting with Pinnacle treated as the acquirer. The pro forma condensed combined financial information is presented for illustrative purposes only and does not necessarily indicate the financial results of the combined companies had the companies actually been combined at the beginning of the period presented, nor does it necessarily indicate the results of operations in future periods or the future financial position of the combined entities. Under the acquisition method of accounting, the assets and liabilities of BNC, as of the effective date of the merger, will be recorded by Pinnacle at their respective fair values and the excess of the merger consideration over the fair value of BNC’s net assets will be allocated to goodwill.

The merger, which was completed on June 16, 2017, provides for BNC common shareholders to receive 0.5235 shares of Pinnacle common stock (the “merger consideration”) for each share of BNC common stock they hold immediately prior to the effective time of the merger. Based on the closing sale price of shares of Pinnacle common stock on the Nasdaq Global Select Market (the “NASDAQ”) on June 15, 2017 of $67.25, the last trading day before the consummation of the merger, the value of the merger consideration per share of BNC common stock was $35.21.

The pro forma allocation of the purchase price reflected in the pro forma condensed combined financial information is subject to adjustment and may vary from the actual purchase price allocation that will be recorded at the time the merger is completed. Adjustments may include, but not be limited to, changes in (i) BNC’s balance sheet through the effective time of the merger; (ii) total merger-related expenses if consummation and/or implementation costs vary from currently estimated amounts; and (iii) the underlying values of assets and liabilities if market conditions differ from current assumptions.

The accounting policies of both Pinnacle and BNC are in the process of being reviewed in detail. Upon completion of such review, conforming adjustments or financial statement reclassification may be determined.

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Note 2—Preliminary Purchase Price Allocation

The pro forma adjustments include the estimated purchase accounting entries to record the merger. The excess of the purchase price over the fair value of net assets acquired, net of deferred taxes, is allocated to goodwill. The fair values are estimated as of March 31, 2017. Estimated fair value adjustments included in the pro forma financial statements are based upon available information and certain assumptions considered reasonable, and may be revised as additional information becomes available.

Core deposit intangible assets of $62.0 million are included in the pro forma adjustments separate from goodwill and amortized using the sum-of-the-years-digits method over ten years. Actual amortization will be recorded on an accelerated basis which reflects the anticipated life of the underlying assets. Goodwill totaling $1.2 billion is included in the pro forma adjustments and is not subject to amortization.

The preliminary purchase price allocation is as follows:

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Note 3—Pro forma adjustments

The following pro forma adjustments have been reflected in the pro forma condensed combined financial information. All taxable adjustments were calculated using a blended statutory effective tax rate of 39.23% to account for both federal and state tax obligations to arrive at deferred tax asset or liability adjustments. All adjustments are based on current assumptions and valuations, which are subject to change.

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Note 4—Merger integration costs

Merger- and integration-related costs are not included in the pro forma condensed combined financial data income since they will be recorded in the combined results of income as they are incurred prior to, or after completion of, the merger and are not indicative of what the historical results of the combined company would have been had the companies been actually combined during the periods presented. Merger- and integration-related costs expected to be incurred resulting from the merger include financial, legal and advisory fees, software termination expenses and lease termination expenses, and are estimated to be $100.1 million pretax; $63.3 million of which is estimated to be incurred at the closing of the merger by BNC. None of these estimated merger- and integration-related charges had been incurred as of March 31, 2017.

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