Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	$ 1,037,965	$ 1,055,728
Equity securities at fair value	3,961	3,781
Liabilities measured - recurring basis [Abstract]
Liabilities	0	0
U.S. Treasury and Government Agencies [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	234,613	341,495
State and Political Subdivisions [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	263,729	253,557
Asset-backed Securities [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	30,524	50,967
Recurring [Member]
Assets measured - recurring basis [Abstract]
Equity securities at fair value	3,961	3,781
Mortgage servicing rights	6,874	7,357
Recurring [Member] \| U.S. Treasury and Government Agencies [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	234,613	341,495
Recurring [Member] \| State and Political Subdivisions [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	263,729	253,557
Recurring [Member] \| Agency Mortgage-Backed Securities [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	509,099	409,709
Recurring [Member] \| Asset-backed Securities [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	30,524	50,967
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	0	328,569
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] \| 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	234,613	12,926
Significant Other Observable Inputs (Level 2) [Member] \| Recurring [Member] \| State and Political Subdivisions [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	263,729	253,557
Significant Other Observable Inputs (Level 2) [Member] \| Recurring [Member] \| Agency Mortgage-Backed Securities [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	509,099	409,709
Significant Other Observable Inputs (Level 2) [Member] \| Recurring [Member] \| Asset-backed Securities [Member]
Assets measured - recurring basis [Abstract]
Debt securities available-for-sale	30,524	50,967
Significant Unobservable Inputs (Level 3) [Member] \| Recurring [Member]
Assets measured - recurring basis [Abstract]
Equity securities at fair value	3,961	3,781
Mortgage servicing rights	6,874	7,357
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] \| 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