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