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Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | $ 1,402,127 | $ 1,455,429
Equity securities at fair value | 2,128 | 2,253
U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 430,277 | 295,770
State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 279,226 | 334,203
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 601,568 | 730,809
Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 91,056 | 94,647
Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 2,128 | 2,253
Mortgage servicing rights | 8,220 | 6,774
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 430,277 | 295,770
Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 279,226 | 334,203
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 601,568 | 730,809
Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 91,056 | 94,647
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 0 | 0
Mortgage servicing rights | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 386,192 | 242,214
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 0 | 0
Mortgage servicing rights | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 44,085 | 53,556
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 279,226 | 334,203
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 601,568 | 730,809
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 91,056 | 94,647
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 2,128 | 2,253
Mortgage servicing rights | 8,220 | 6,774
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | $ 0 | $ 0

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