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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023
--- | --- | --- | --- | --- | ---
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities available for sale, Cost Basis | $ 177,767,000 |  | $ 184,018,000 |  |
Investment securities available for sale, Gross Unrealized Gains | 444,000 |  | 226,000 |  |
Investment securities available for sale, Gross Unrealized Losses | (13,260,000) |  | (17,607,000) |  |
Investment securities available for sale, Allowance for credit losses | (360,000) | $ (360,000) | (926,000) | $ (926,000) | $ (926,000)
Available for Sale, Fair Value | 164,591,000 |  | 165,711,000 |  |
Investment securities held to maturity, Cost Basis | 65,451,000 |  | 63,979,000 |  |
Investment securities held to maturity, Gross Unrealized Gains | 201,000 |  | 49,000 |  |
Investment securities held to maturity, Gross Unrealized Losses | (3,762,000) |  | (5,407,000) |  |
Investment securities held to maturity, Fair value | 61,890,000 |  | 58,621,000 |  |
Investment securities held to maturity, Allowance for credit losses | (88,000) | (100,000) | (37,000) | (32,000) | (109,000)
U.S. Agency |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities available for sale, Cost Basis | 5,404,000 |  | 6,035,000 |  |
Investment securities available for sale, Gross Unrealized Losses | (547,000) |  | (696,000) |  |
Available for Sale, Fair Value | 4,857,000 |  | 5,339,000 |  |
Investment securities held to maturity, Cost Basis | 2,500,000 |  | 2,500,000 |  |
Investment securities held to maturity, Gross Unrealized Losses | (284,000) |  | (379,000) |  |
Investment securities held to maturity, Fair value | 2,216,000 |  | 2,121,000 |  |
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |  |
U.S. Agency mortgage-backed securities |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities available for sale, Cost Basis | 103,083,000 |  | 104,820,000 |  |
Investment securities available for sale, Gross Unrealized Gains | 307,000 |  | 179,000 |  |
Investment securities available for sale, Gross Unrealized Losses | (9,779,000) |  | (11,924,000) |  |
Available for Sale, Fair Value | 93,611,000 |  | 93,075,000 |  |
Investment securities held to maturity, Cost Basis | 27,015,000 |  | 24,222,000 |  |
Investment securities held to maturity, Gross Unrealized Gains | 187,000 |  | 49,000 |  |
Investment securities held to maturity, Gross Unrealized Losses | (1,649,000) |  | (2,058,000) |  |
Investment securities held to maturity, Fair value | 25,553,000 |  | 22,213,000 |  |
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |  |
Municipal |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities available for sale, Cost Basis | 9,163,000 |  | 11,159,000 |  |
Investment securities available for sale, Gross Unrealized Gains | 4,000 |  | 1,000 |  |
Investment securities available for sale, Gross Unrealized Losses | (493,000) |  | (800,000) |  |
Available for Sale, Fair Value | 8,674,000 |  | 10,360,000 |  |
Investment securities held to maturity, Cost Basis | 32,521,000 |  | 32,787,000 |  |
Investment securities held to maturity, Gross Unrealized Gains | 14,000 |  |  |  |
Investment securities held to maturity, Gross Unrealized Losses | (1,752,000) |  | (2,797,000) |  |
Investment securities held to maturity, Fair value | 30,783,000 |  | 29,990,000 |  |
Investment securities held to maturity, Allowance for credit losses | (2,000) | (2,000) | (2,000) | (2,000) | (2,000)
Corporate bonds |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities available for sale, Cost Basis | 60,117,000 |  | 62,004,000 |  |
Investment securities available for sale, Gross Unrealized Gains | 133,000 |  | 46,000 |  |
Investment securities available for sale, Gross Unrealized Losses | (2,441,000) |  | (4,187,000) |  |
Investment securities available for sale, Allowance for credit losses | (360,000) | (360,000) | (926,000) | (926,000) | (926,000)
Available for Sale, Fair Value | 57,449,000 |  | 56,937,000 |  |
Corporate bonds and other securities |  |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |  |
Investment securities held to maturity, Cost Basis | 3,415,000 |  | 4,470,000 |  |
Investment securities held to maturity, Gross Unrealized Losses | (77,000) |  | (173,000) |  |
Investment securities held to maturity, Fair value | 3,338,000 |  | 4,297,000 |  |
Investment securities held to maturity, Allowance for credit losses | $ (86,000) | $ (98,000) | $ (35,000) | $ (30,000) | $ (107,000)

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