Fair Value of Financial Assets and Liabilities - Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Fair Value of Financial Assets and Liabilities [Abstract]
Equity securities at fair value	$ 3,666	$ 4,154
Mortgage servicing rights	6,728	6,751
U.S. Treasury and Government Agencies [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	160,469	235,759
State and Political Subdivisions [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	263,881	266,891
Agency Mortgage-Backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	641,461	588,262
Asset-backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	22,394	29,807
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Treasury and Government Agencies [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| State and Political Subdivisions [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Agency Mortgage-Backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Asset-backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Treasury and Government Agencies [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	160,469	235,759
Significant Other Observable Inputs (Level 2) [Member] \| State and Political Subdivisions [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	263,881	266,891
Significant Other Observable Inputs (Level 2) [Member] \| Agency Mortgage-Backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	641,461	588,262
Significant Other Observable Inputs (Level 2) [Member] \| Asset-backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	22,394	29,807
Significant Unobservable Inputs (Level 3) [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Equity securities at fair value	3,666	4,154
Mortgage servicing rights	6,728	6,751
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Treasury and Government Agencies [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] \| State and Political Subdivisions [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Agency Mortgage-Backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Asset-backed Securities [Member]
Fair Value of Financial Assets and Liabilities [Abstract]
Debt securities available-for-sale	$ 0	$ 0

Fair Value of Financial Assets and Liabilities - Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Recurring Basis (Details) - Recurring [Member] - USD ($)
$ in Thousands