| Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
| Available-for-Sale | | 2025 | |
| | | | | | | Gross | | | Gross | | | Estimated | |
| | | Amortized | | | Unrealized | | | Unrealized | | | Fair | |
| | | Cost | | | Gains | | | Losses | | | Value | |
| Debt securities: | | | | | | | | | | | | | | | | |
| U.S. Government-sponsored agencies collateralized by mortgage obligations-residential | | $ | 257,520,000 | | | $ | 2,709,000 | | | $ | (7,064,000 | ) | | $ | 253,165,000 | |
| U.S. Government agencies collateralized by mortgage obligations-commercial | | | 141,861,000 | | | | 1,245,000 | | | | (8,342,000 | ) | | | 134,764,000 | |
| Obligations of states and political subdivisions | | | 92,109,000 | | | | 1,038,000 | | | | (4,481,000 | ) | | | 88,666,000 | |
| | | $ | 491,490,000 | | | $ | 4,992,000 | | | $ | (19,887,000 | ) | | $ | 476,595,000 | |
| Available-for-Sale | | 2024 | |
| | | | | | | Gross | | | Gross | | | Estimated | |
| | | Amortized | | | Unrealized | | | Unrealized | | | Fair | |
| | | Cost | | | Gains | | | Losses | | | Value | |
| Debt securities: | | | | | | | | | | | | | | | | |
| U.S. Government-sponsored agencies collateralized by mortgage obligations-residential | | | 243,709,000 | | | | 138,000 | | | | (15,456,000 | ) | | | 228,391,000 | |
| U.S. Government agencies collateralized by mortgage obligations-commercial | | | 133,749,000 | | | | 77,000 | | | | (11,956,000 | ) | | | 121,870,000 | |
| Obligations of states and political subdivisions | | | 95,975,000 | | | | 315,000 | | | | (8,816,000 | ) | | | 87,474,000 | |
| | | $ | 473,433,000 | | | $ | 530,000 | | | $ | (36,228,000 | ) | | $ | 437,735,000 | |
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| December 31, 2025 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| Debt securities: | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Government-sponsored agencies collateralized by mortgage obligations-residential | | $ | 16,496,000 | | | $ | 109,000 | | | $ | 63,328,000 | | | $ | 6,955,000 | | | $ | 79,824,000 | | | $ | 7,064,000 | |
| U.S. Government agencies collateralized by mortgage obligations-commercial | | | 6,941,000 | | | | 35,000 | | | | 51,781,000 | | | | 8,307,000 | | | | 58,722,000 | | | | 8,342,000 | |
| Obligations of states and political subdivisions | | | 2,783,000 | | | | 7,000 | | | | 35,480,000 | | | | 4,474,000 | | | | 38,263,000 | | | | 4,481,000 | |
| | | $ | 26,220,000 | | | $ | 151,000 | | | $ | 150,589,000 | | | $ | 19,736,000 | | | $ | 176,809,000 | | | $ | 19,887,000 | |
| December 31, 2024 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| Debt securities: | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Government-sponsored agencies collateralized by mortgage obligations-residential | | $ | 107,328,000 | | | $ | 1,917,000 | | | $ | 94,506,000 | | | $ | 13,539,000 | | | $ | 201,834,000 | | | $ | 15,456,000 | |
| U.S. Government agencies collateralized by mortgage obligations-commercial | | | 55,921,000 | | | | 926,000 | | | | 57,735,000 | | | | 11,030,000 | | | | 113,656,000 | | | | 11,956,000 | |
| Obligations of states and political subdivisions | | | 18,938,000 | | | | 250,000 | | | | 48,460,000 | | | | 8,566,000 | | | | 67,398,000 | | | | 8,816,000 | |
| | | $ | 182,187,000 | | | $ | 3,093,000 | | | $ | 200,701,000 | | | $ | 33,135,000 | | | $ | 382,888,000 | | | $ | 36,228,000 | |
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | Amortized | | | Estimated Fair | |
| | | Cost | | | Value | |
| Under one year | | $ | 790,000 | | | $ | 789,000 | |
| After one year through five years | | | 6,524,000 | | | | 6,624,000 | |
| After five years through ten years | | | 17,201,000 | | | | 17,470,000 | |
| After ten years | | | 67,594,000 | | | | 63,783,000 | |
| Investment securities not due at a single maturity date: | | | | | | | | |
| U.S. Government-sponsored agencies collateralized by mortgage obligations-residential | | | 257,520,000 | | | | 253,165,000 | |
| U.S. Government agencies collateralized by mortgage obligations-commercial | | | 141,861,000 | | | | 134,764,000 | |
| | | $ | 491,490,000 | | | $ | 476,595,000 | |
|