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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities available for sale, Cost Basis | $ 180,571,000 |  | $ 172,857,000 |  |  |
Investment securities available for sale, Gross Unrealized Gains | 1,042,000 |  | 186,000 |  |  |
Investment securities available for sale, Gross Unrealized Losses | (12,052,000) |  | (17,063,000) |  |  |
Investment securities available for sale, Allowance for credit losses | 0 | $ (1,000,000) | (360,000) | $ (360,000) | $ (360,000) | $ (926,000)
Available for sale, Fair Value | 169,561,000 |  | 155,620,000 |  |  |
Investment securities - HTM, Cost Basis | 67,273,000 |  | 63,926,000 |  |  |
Investment securities held to maturity, Allowance for credit losses | (94,000) | (85,000) | (89,000) | (88,000) | (100,000) | (37,000)
Investment securities - HTM, Carrying Value | 67,179,000 |  | 63,837,000 |  |  |
Investment securities held to maturity, Gross Unrealized Gains | 161,000 |  | 28,000 |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (3,848,000) |  | (5,394,000) |  |  |
Investment securities - HTM, Fair Value | 63,492,000 |  | 58,471,000 |  |  |
U.S. Agency |  |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities available for sale, Cost Basis | 5,207,000 |  | 5,345,000 |  |  |
Investment securities available for sale, Gross Unrealized Losses | (416,000) |  | (679,000) |  |  |
Available for sale, Fair Value | 4,791,000 |  | 4,666,000 |  |  |
Investment securities - HTM, Cost Basis | 2,500,000 |  | 2,500,000 |  |  |
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |  |  |
Investment securities - HTM, Carrying Value | 2,500,000 |  | 2,500,000 |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (246,000) |  | (365,000) |  |  |
Investment securities - HTM, Fair Value | 2,254,000 |  | 2,135,000 |  |  |
U.S. Agency mortgage-backed securities |  |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities available for sale, Cost Basis | 115,335,000 |  | 104,227,000 |  |  |
Investment securities available for sale, Gross Unrealized Gains | 590,000 |  | 90,000 |  |  |
Investment securities available for sale, Gross Unrealized Losses | (9,748,000) |  | (12,783,000) |  |  |
Available for sale, Fair Value | 106,177,000 |  | 91,534,000 |  |  |
Investment securities - HTM, Cost Basis | 33,769,000 |  | 26,966,000 |  |  |
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |  |  |
Investment securities - HTM, Carrying Value | 33,769,000 |  | 26,966,000 |  |  |
Investment securities held to maturity, Gross Unrealized Gains | 157,000 |  | 28,000 |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (1,885,000) |  | (2,403,000) |  |  |
Investment securities - HTM, Fair Value | 32,041,000 |  | 24,591,000 |  |  |
Municipal |  |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities available for sale, Cost Basis | 11,261,000 |  | 9,031,000 |  |  |
Investment securities available for sale, Gross Unrealized Gains | 94,000 |  | 2,000 |  |  |
Investment securities available for sale, Gross Unrealized Losses | (417,000) |  | (670,000) |  |  |
Available for sale, Fair Value | 10,938,000 |  | 8,363,000 |  |  |
Investment securities - HTM, Cost Basis | 28,505,000 |  | 30,961,000 |  |  |
Investment securities held to maturity, Allowance for credit losses | (1,000) | (2,000) | (2,000) | (2,000) | (2,000) | (2,000)
Investment securities - HTM, Carrying Value | 28,504,000 |  | 30,959,000 |  |  |
Investment securities held to maturity, Gross Unrealized Gains | 4,000 |  |  |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (1,588,000) |  | (2,553,000) |  |  |
Investment securities - HTM, Fair Value | 26,920,000 |  | 28,406,000 |  |  |
Corporate bonds |  |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities available for sale, Cost Basis | 48,768,000 |  | 54,254,000 |  |  |
Investment securities available for sale, Gross Unrealized Gains | 358,000 |  | 94,000 |  |  |
Investment securities available for sale, Gross Unrealized Losses | (1,471,000) |  | (2,931,000) |  |  |
Investment securities available for sale, Allowance for credit losses |  | (1,000,000) | (360,000) | (360,000) | (360,000) | (926,000)
Available for sale, Fair Value | 47,655,000 |  | 51,057,000 |  |  |
Corporate bonds and other securities |  |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |  |
Investment securities - HTM, Cost Basis | 2,499,000 |  | 3,499,000 |  |  |
Investment securities held to maturity, Allowance for credit losses | (93,000) | $ (83,000) | (87,000) | $ (86,000) | $ (98,000) | $ (35,000)
Investment securities - HTM, Carrying Value | 2,406,000 |  | 3,412,000 |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (129,000) |  | (73,000) |  |  |
Investment securities - HTM, Fair Value | $ 2,277,000 |  | $ 3,339,000 |  |  |

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