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Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | $ 1,135,878 | $ 1,256,226
Equity securities at fair value | 2,900 | 2,166
U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 351,339 | 381,932
State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 244,478 | 265,102
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 452,298 | 520,085
Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 87,763 | 89,107
Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 2,900 | 2,166
Mortgage servicing rights | 8,289 | 8,468
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 351,339 | 381,932
Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 244,478 | 265,102
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 452,298 | 520,085
Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 87,763 | 89,107
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 | 331,200 | 346,265
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 | 20,139 | 35,667
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | State and Political Subdivisions [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 244,478 | 265,102
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 | 452,298 | 520,085
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Asset-backed Securities [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Debt securities available-for-sale | 87,763 | 89,107
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] |  |
Assets measured - recurring basis [Abstract] |  |
Equity securities at fair value | 2,900 | 2,166
Mortgage servicing rights | 8,289 | 8,468
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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