Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements of the Corporation have been prepared in conformity with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as revenues and expenses during the period. Actual results could differ from those estimates. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2020. Operating results for the three and six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Corporation evaluates subsequent events through the date of filing of this Form 10-Q with the SEC. CECL Adoption On January 1, 2020, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. The Corporation recorded an increase of $58.3 million to the ACL on January 1, 2020 as a result of the adoption of CECL. Retained earnings decreased $43.8 million and deferred tax assets increased by $12.4 million. Included in the $58.3 million increase to the ACL was $2.1 million for certain OBS credit exposures that was previously recognized in other liabilities before the adoption of CECL. CARES Act and Consolidated Appropriations Act - 2021 On March 27, 2020 the CARES Act was signed into law. The CARES Act includes an option for financial institutions to suspend the requirements of GAAP for certain loan modifications that would otherwise be categorized as a TDR. Certain conditions must be met with respect to the loan modification including that the modification is related to COVID-19 and the modified loan was not more than 30 days past due on December 31, 2019. On December 27, 2020, the 2021 Consolidated Appropriations Act was signed into law and this Act extended the relief for TDR treatment that was set to expire on December 31, 2020 to the earlier of 60 days after the national emergency termination date or January 1, 2022. The Corporation is applying the option under the CARES act for all loan modifications that qualify. Recently Adopted Accounting Standards On January 1, 2021, the Corporation adopted ASC Update 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The Corporation adopted this standards update effective with its March 31, 2021 quarterly report on Form 10-Q and it did not have a material impact on the consolidated financial statements. On January 1, 2021, the Corporation adopted ASC Update 2021-01 Reference Rate Reform (Topic 848). This update permits entities to apply optional expedients in Topic 848 to derivative instruments modified because of LIBOR transition affected by changes to the interest rates used for discounting, margining or contract price alignment due to reference rate reform. This update was effective upon issuance and entities may elect to apply the guidance to modifications either retrospectively, as of any date from the beginning of any interim period that includes or is subsequent to March 12, 2020, or prospectively to new modifications from any date in an interim period that includes or is subsequent to January 7, 2021. The Corporation adopted this standards update retrospectively effective with its March 31, 2021 quarterly report on Form 10-Q and the adoption did not have a material impact on the consolidated financial statements. Reclassifications Certain amounts in the 2020 consolidated financial statements and notes have been reclassified to conform to the 2021 presentation.