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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Basis of Presentation | Basis of Presentation — The accompanying unaudited consolidated financial statements have been prepared in accordance with instructions to Form 10-Q and therefore do not include all information and footnotes necessary for a fair presentation of financial position, results of operations, and cash flows in conformity with U.S. generally accepted accounting principles (U.S. GAAP). All adjustments consisting of normally recurring accruals that, in the opinion of management, are necessary for a fair presentation of the financial position and results of operations for the periods covered by the report have been included. The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes appearing in Pinnacle Financial's Annual Report on Form 10-K for the year ended December 31, 2020 (2020 10-K). These consolidated financial statements include the accounts of Pinnacle Financial and its wholly-owned subsidiaries. Certain statutory trust affiliates of Pinnacle Financial, as noted in Note 11. Other Borrowings are included in these consolidated financial statements pursuant to the equity method of accounting. Significant intercompany transactions and accounts are eliminated in consolidation.
Use of Estimates | Use of Estimates — The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term include the determination of the allowance for credit losses and determination of any impairment of goodwill or intangible assets. There have been no significant changes to Pinnacle Financial's significant accounting policies as disclosed in the 2020 10-K.
Income Per Common Share | Income Per Common Share — Basic net income per common share (EPS) is computed by dividing net income available to common shareholders by the weighted average common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted. The difference between basic and diluted weighted average common shares outstanding is attributable to common stock options, restricted share awards, and restricted share unit awards. The dilutive effect of outstanding options, restricted share awards, and restricted share unit awards is reflected in diluted EPS by application of the treasury stock method. The following is a summary of the basic and diluted net income per common share calculations for the three and nine months ended September 30, 2021 and 2020 (in thousands, except per share data):
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 | 2020 |  | 2021 | 2020
Basic net income per common share calculation: |  |  |  |  |
Numerator - Net income available to common shareholders | $ | 132,779 |  | $ | 106,847 |  |  | $ | 382,401 |  | $ | 197,647 |
Denominator - Weighted average common shares outstanding | 75,494 |  | 75,241 |  |  | 75,450 |  | 75,418 |
Basic net income per common share | $ | 1.76 |  | $ | 1.42 |  |  | $ | 5.07 |  | $ | 2.62 |
Diluted net income per common share calculation: |  |  |  |  |
Numerator – Net income available to common shareholders | $ | 132,779 |  | $ | 106,847 |  |  | $ | 382,401 |  | $ | 197,647 |
Denominator - Weighted average common shares outstanding | 75,494 |  | 75,241 |  |  | 75,450 |  | 75,418 |
Dilutive common shares contingently issuable | 342 |  | 119 |  |  | 311 |  | 127 |
Weighted average diluted common shares outstanding | 75,836 |  | 75,360 |  |  | 75,761 |  | 75,545 |
Diluted net income per common share | $ | 1.75 |  | $ | 1.42 |  |  | $ | 5.05 |  | $ | 2.62 |
Recently Adopted Accounting Pronouncements | Recently Adopted Accounting Pronouncements — In January 2020, the FASB issued Accounting Standards Update 2020-01, Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. These amendments, among other things, clarify that a company should consider observable transactions that require a company to either apply or discontinue the equity method of accounting under Topic 323, Investments-Equity Method and Joint Ventures, for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. The amendments also clarify that when determining the accounting for certain forward contracts and purchased options a company should not consider, whether upon settlement or exercise, if the underlying securities would be accounted for under the equity method or fair value option. The guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. An entity should apply ASU 2020-01 prospectively at the beginning of the interim period that includes the adoption date. The amendments became effective for Pinnacle Financial on January 1, 2021 and had no impact on Pinnacle Financial's consolidated financial statements. In December 2019, the FASB issued Accounting Standards Update 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes to simplify various aspects of the current guidance to promote consistent application of the standard among reporting entities by moving certain exceptions to the general principles. The amendments are effective for fiscal years beginning after December 15, 2020. The amendments became effective for Pinnacle Financial on January 1, 2021 and had no impact on Pinnacle Financial's consolidated financial statements. In March 2020, the FASB issued Accounting Standards Update 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, and has issued subsequent amendments thereto, which provides temporary optional guidance to ease the potential burden in accounting for reference rate reform. The ASU provides optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. It is intended to help stakeholders during the global market-wide reference rate transition period. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. Pinnacle Financial is implementing a transition plan to identify and modify its loans and other financial instruments, including certain indebtedness, with attributes that are either directly or indirectly influenced by LIBOR. Pinnacle Financial is assessing ASU 2020-04 and its impact on the transition away from LIBOR for its loans and other financial instruments.
Newly Issued Not Yet Effective Accounting Standards | Newly Issued Not Yet Effective Accounting Standards — Other than those pronouncements discussed above which have been recently adopted, Pinnacle Financial does not believe there were any other recently issued accounting pronouncements that are expected to materially impact its consolidated financial statements.
Reclassifications | Reclassifications — Some items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or stockholder's equity.
Subsequent Events | Subsequent Events — ASC Topic 855, Subsequent Events, establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued. Pinnacle Financial evaluated all events or transactions that occurred after September 30, 2021 through the date of the issued financial statements.

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