General (Policies)	6 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recent Accounting Changes Adopted in 2021 and New Accounting Pronouncements Not Yet Adopted	Recent Accounting Changes Adopted In 2021 The Corporation continually monitors potential accounting pronouncements and the following pronouncements have been deemed to have the most applicability to the Corporation's financial statements: FASB Accounting Standards Updates No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Summary - The FASB issued Accounting Standards Update (ASU) No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This new guidance replaces the previous "incurred loss" model for measuring credit losses with an "expected life of loan loss" model, referred to as the CECL model. Under the CECL model, certain financial assets carried at amortized cost, such as loans held for investment and held-to-maturity debt securities, are required to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement takes place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the “incurred loss” model, which delayed recognition until it is probable a loss had been incurred. The Corporation developed models that satisfy the requirements of the new standard which are governed by a system of internal controls and a cross-functional working group consisting of accounting, finance, and credit administration personnel. The loan portfolio was pooled into ten loan segments with similar risk characteristics for which the probability of default/loss given default methodology was applied. The Corporation utilized a one-year economic forecast period then reverted to historical macroeconomic levels for the remaining life of the portfolio. A baseline macroeconomic scenario, along with other scenarios, were used to develop a range of estimated credit losses for which to determine the best estimate within. The ASU was effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Pursuant to the CARES Act and the related joint statement of federal banking regulators (which also became effective as of March 27, 2020), and consistent with guidance from the SEC and FASB, the Corporation elected to delay implementation of ASU No. 2016-13, which was set to expire on December 31, 2020. However, the CAA (as discussed above) extended the temporary relief from CECL compliance to the earlier of the first day of the fiscal year that begins after the date on which the national emergency concerning COVID-19 terminates, or January 1, 2022. The Corporation elected to delay implementation of CECL following the approval of the CARES Act and, with the enactment of the CAA, the Corporation elected to adopt CECL on January 1, 2021. This allows the Corporation to utilize the CECL standard for the entire year of 2021, while its 2020 financial statements were prepared under the incurred loss model. As of the adoption and day one measurement date of January 1, 2021, the Corporation recorded a one-time cumulative-effect adjustment to retained earnings, net of income taxes, on the consolidated balance sheet of $68.0 million. The allowance increased 57 percent from December 31, 2020, or $74.1 million, because it covered expected credit losses over the life of the loan portfolio, which approximates four years, and it included an allowance on all purchased loans that were previously excluded from the allowance for loan losses calculation. CECL also requires the establishment of a reserve for potential losses from unfunded commitments that is recorded in other liabilities, separate from allowance for credit losses, which was approximately $20.5 million. An allowance for credit losses of $245,000 was recorded on the state and municipal securities classified as held to maturity based on applying the long-term historical credit loss rate, as published by Moody’s, for similarly rated securities. FASB Accounting Standards Updates No. 2019-11 - Codification Improvements to (Topic 326): Financial Instruments - Credit Losses Summary - The FASB issued ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses in order to address issues raised by stakeholders during the implementation of ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments. Among other narrow-scope improvements, the new ASU clarifies guidance around how to report expected recoveries. “Expected recoveries” describes a situation in which an organization recognizes a full or partial write-off of the amortized cost basis of a financial asset, but then later determines that the amount written off, or a portion of that amount, will in fact be recovered. While applying the credit losses standard, stakeholders questioned whether expected recoveries were permitted on assets that had already shown credit deterioration at the time of purchase (also known as PCD assets). In response to this question, the ASU permits organizations to record expected recoveries on PCD assets. In addition to other narrow technical improvements, the ASU also reinforces existing guidance that prohibits organizations from recording negative allowances for available-for-sale debt securities. The ASU includes effective dates and transition requirements that vary depending on whether or not an entity has already adopted ASU No. 2016-13. As discussed above, pursuant to the CARES Act, the Corporation elected to defer the adoption of CECL. Additionally, the 2021 Consolidated Appropriations Act ("CAA"), signed into law on December 27, 2020, amended the CARES Act by extending the temporary relief from CECL compliance to the earlier of the first day of the fiscal year that begins after the date on which the national emergency concerning COVID-19 terminates, or January 1, 2022. The Corporation elected to delay implementation of CECL following the approval of the CARES Act and, with the enactment of the CAA, the Corporation elected to adopt CECL on January 1, 2021. The adoption of this standard did not have a significant effect on the Corporation’s consolidated financial statements or disclosures. FASB Accounting Standards Update No. 2019-12 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes Summary - The FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is expected to reduce cost and complexity related to the accounting for income taxes. The ASU removes specific exceptions to the general principles in Topic 740 in Generally Accepted Accounting Principles (GAAP). It eliminates the need for an organization to analyze whether the following apply in a given period: • Exception to the incremental approach for intraperiod tax allocation; • Exceptions to accounting for basis differences when there are ownership changes in foreign investments; and • Exception in interim period income tax accounting for year-to-date losses that exceed anticipated losses. The ASU also improves financial statement preparers’ application of income tax-related guidance and simplifies GAAP for: • Franchise taxes that are partially based on income; • Transactions with a government that result in a step up in the tax basis of goodwill • Separate financial statements of legal entities that are not subject to tax; and • Enacted changes in tax laws in interim periods. The ASU is part of the FASB’s simplification initiative to make narrow-scope simplifications and improvements to accounting standards through a series of short-term projects. For public business entities, the ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the ASU was permitted. The Corporation adopted this standard on January 1, 2021 and adoption of this standard did not have a significant effect on the Corporation's consolidated financial statements or disclosures. New Accounting Pronouncements Not Yet Adopted FASB Accounting Standards Updates - No. 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Summary - The FASB issued ASU No. 2020-04 to provide temporary optional guidance to ease the potential burden in accounting for reference rate reform. LIBOR and other interbank offered rates are widely used benchmarks or reference rates in the United States and globally. Trillions of dollars in loans, derivatives, and other financial contracts reference LIBOR, the benchmark interest rate banks use to make short-term loans to each other. With global capital markets expected to move away from LIBOR and other interbank offered rates and move toward rates that are more observable or transaction based and less susceptible to manipulation, the FASB launched a broad project in late 2018 to address potential accounting challenges expected to arise from the transition. The new guidance 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. The ASU is intended to help stakeholders during the global market-wide reference rate transition period. Entities may apply this ASU as of the beginning of an interim period that includes the March 12, 2020 issuance date of the ASU, through December 31, 2022. The Corporation expects to adopt the practical expedients included in the ASU prior to December 31, 2022. The Corporation is implementing a transition plan to identify and modify its loans and other financial instruments with attributes that are either directly or indirectly influenced by LIBOR. The Corporation is assessing ASU 2020-04 and its impact on the Corporation's transition away from LIBOR for its loans and other financial instruments. FASB Accounting Standards Updates - Accounting Standards Update No. 2021-01 - Reference Rate Reform (Topic 848): Scope Summary - The FASB has published ASU 2021-01, Reference Rate Reform. ASU 2021-01 clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The ASU also amends the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. An entity may elect to apply the amendments in this Update on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, up to the date that financial statements are available to be issued. If an entity elects to apply any of the amendments in this Update for an eligible hedging relationship, any adjustments as a result of those elections must be reflected as of the date the entity applies the election. The amendments in this Update do not apply to contract modifications made after December 31, 2022, new hedging relationships entered into after December 31, 2022, and existing hedging relationships evaluated for effectiveness in periods after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that apply certain optional expedients in which the accounting effects are recorded through the end of the hedging relationship (including periods after December 31, 2022). The Corporation is assessing ASU 2021-01 and its impact on the Corporation's transition away from LIBOR for its loans and other financial instruments.

Summary - The FASB issued Accounting Standards Update (ASU) No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This new guidance replaces the previous "incurred loss" model for measuring credit losses with an "expected life of loan loss" model, referred to as the CECL model.

Under the CECL model, certain financial assets carried at amortized cost, such as loans held for investment and held-to-maturity debt securities, are required to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement takes place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the “incurred loss” model, which delayed recognition until it is probable a loss had been incurred.

The Corporation developed models that satisfy the requirements of the new standard which are governed by a system of internal controls and a cross-functional working group consisting of accounting, finance, and credit administration personnel. The loan portfolio was pooled into ten loan segments with similar risk characteristics for which the probability of default/loss given default methodology was applied. The Corporation utilized a one-year economic forecast period then reverted to historical macroeconomic levels for the remaining life of the portfolio. A baseline macroeconomic scenario, along with other scenarios, were used to develop a range of estimated credit losses for which to determine the best estimate within.

The ASU was effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Pursuant to the CARES Act and the related joint statement of federal banking regulators (which also became effective as of March 27, 2020), and consistent with guidance from the SEC and FASB, the Corporation elected to delay implementation of ASU No. 2016-13, which was set to expire on December 31, 2020. However, the CAA (as discussed above) extended the temporary relief from CECL compliance to the earlier of the first day of the fiscal year that begins after the date on which the national emergency concerning COVID-19 terminates, or January 1, 2022. The Corporation elected to delay implementation of CECL following the approval of the CARES Act and, with the enactment of the CAA, the Corporation elected to adopt CECL on January 1, 2021. This allows the Corporation to utilize the CECL standard for the entire year of 2021, while its 2020 financial statements were prepared under the incurred loss model.

As of the adoption and day one measurement date of January 1, 2021, the Corporation recorded a one-time cumulative-effect adjustment to retained earnings, net of income taxes, on the consolidated balance sheet of $68.0 million. The allowance increased 57 percent from December 31, 2020, or $74.1 million, because it covered expected credit losses over the life of the loan portfolio, which approximates four years, and it included an allowance on all purchased loans that were previously excluded from the allowance for loan losses calculation. CECL also requires the establishment of a reserve for potential losses from unfunded commitments that is recorded in other liabilities, separate from allowance for credit losses, which was approximately $20.5 million. An allowance for credit losses of $245,000 was recorded on the state and municipal securities classified as held to maturity based on applying the long-term historical credit loss rate, as published by Moody’s, for similarly rated securities.

Summary - The FASB issued ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses in order to address issues raised by stakeholders during the implementation of ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments.

Among other narrow-scope improvements, the new ASU clarifies guidance around how to report expected recoveries. “Expected recoveries” describes a situation in which an organization recognizes a full or partial write-off of the amortized cost basis of a financial asset, but then later determines that the amount written off, or a portion of that amount, will in fact be recovered. While applying the credit losses standard, stakeholders questioned whether expected recoveries were permitted on assets that had already shown credit deterioration at the time of purchase (also known as PCD assets). In response to this question, the ASU permits organizations to record expected recoveries on PCD assets. In addition to other narrow technical improvements, the ASU also reinforces existing guidance that prohibits organizations from recording negative allowances for available-for-sale debt securities.

The ASU includes effective dates and transition requirements that vary depending on whether or not an entity has already adopted ASU No. 2016-13. As discussed above, pursuant to the CARES Act, the Corporation elected to defer the adoption of CECL. Additionally, the 2021 Consolidated Appropriations Act ("CAA"), signed into law on December 27, 2020, amended the CARES Act by extending the temporary relief from CECL compliance to the earlier of the first day of the fiscal year that begins after the date on which the national emergency concerning COVID-19 terminates, or January 1, 2022. The Corporation elected to delay implementation of CECL following the approval of the CARES Act and, with the enactment of the CAA, the Corporation elected to adopt CECL on January 1, 2021. The adoption of this standard did not have a significant effect on the Corporation’s consolidated financial statements or disclosures.

The ASU is part of the FASB’s simplification initiative to make narrow-scope simplifications and improvements to accounting standards through a series of short-term projects. For public business entities, the ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the ASU was permitted. The Corporation adopted this standard on January 1, 2021 and adoption of this standard did not have a significant effect on the Corporation's consolidated financial statements or disclosures.

Summary - The FASB issued ASU No. 2020-04 to provide temporary optional guidance to ease the potential burden in accounting for reference rate reform. LIBOR and other interbank offered rates are widely used benchmarks or reference rates in the United States and globally. Trillions of dollars in loans, derivatives, and other financial contracts reference LIBOR, the benchmark interest rate banks use to make short-term loans to each other. With global capital markets expected to move away from LIBOR and other interbank offered rates and move toward rates that are more observable or transaction based and less susceptible to manipulation, the FASB launched a broad project in late 2018 to address potential accounting challenges expected to arise from the transition. The new guidance 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. The ASU is intended to help stakeholders during the global market-wide reference rate transition period.

Entities may apply this ASU as of the beginning of an interim period that includes the March 12, 2020 issuance date of the ASU, through December 31, 2022. The Corporation expects to adopt the practical expedients included in the ASU prior to December 31, 2022. The Corporation is implementing a transition plan to identify and modify its loans and other financial instruments with attributes that are either directly or indirectly influenced by LIBOR. The Corporation is assessing ASU 2020-04 and its impact on the Corporation's transition away from LIBOR for its loans and other financial instruments.

Summary - The FASB has published ASU 2021-01, Reference Rate Reform. ASU 2021-01 clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The ASU also amends the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition.

An entity may elect to apply the amendments in this Update on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, up to the date that financial statements are available to be issued.

The amendments in this Update do not apply to contract modifications made after December 31, 2022, new hedging relationships entered into after December 31, 2022, and existing hedging relationships evaluated for effectiveness in periods after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that apply certain optional expedients in which the accounting effects are recorded through the end of the hedging relationship (including periods after December 31, 2022). The Corporation is assessing ASU 2021-01 and its impact on the Corporation's transition away from LIBOR for its loans and other financial instruments.