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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
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Information concerning investments with unrealized gains and losses |  |  |
Investment securities available for sale, Cost Basis | $ 183,254,000 | $ 184,018,000 |
Investment securities available for sale, Gross Unrealized Gains | 159,000 | 226,000 |
Investment securities available for sale, Gross Unrealized Losses | (17,845,000) | (17,607,000) |
Investment securities available for sale, Allowance for credit losses | (116,000) | (926,000) | $ (926,000)
Available for Sale, Fair Value | 165,452,000 | 165,711,000 |
Investment securities held to maturity, Cost Basis | 64,967,000 | 63,979,000 |
Investment securities held to maturity, Gross Unrealized Gains | 24,000 | 49,000 |
Investment securities held to maturity, Gross Unrealized Losses | (5,811,000) | (5,407,000) |
Investment securities held to maturity, Fair value | 59,180,000 | 58,621,000 |
Investment securities held to maturity, Allowance for credit losses | (90,000) | (37,000) | (83,000)
U.S. Agency |  |  |
Information concerning investments with unrealized gains and losses |  |  |
Investment securities available for sale, Cost Basis | 6,001,000 | 6,035,000 |
Investment securities available for sale, Gross Unrealized Losses | (735,000) | (696,000) |
Available for Sale, Fair Value | 5,266,000 | 5,339,000 |
Investment securities held to maturity, Cost Basis | 2,500,000 | 2,500,000 |
Investment securities held to maturity, Gross Unrealized Losses | (391,000) | (379,000) |
Investment securities held to maturity, Fair value | 2,109,000 | 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 | 105,820,000 | 104,820,000 |
Investment securities available for sale, Gross Unrealized Gains | 101,000 | 179,000 |
Investment securities available for sale, Gross Unrealized Losses | (12,827,000) | (11,924,000) |
Available for Sale, Fair Value | 93,094,000 | 93,075,000 |
Investment securities held to maturity, Cost Basis | 25,273,000 | 24,222,000 |
Investment securities held to maturity, Gross Unrealized Gains | 24,000 | 49,000 |
Investment securities held to maturity, Gross Unrealized Losses | (2,355,000) | (2,058,000) |
Investment securities held to maturity, Fair value | 22,942,000 | 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 | 10,840,000 | 11,159,000 |
Investment securities available for sale, Gross Unrealized Gains | 1,000 | 1,000 |
Investment securities available for sale, Gross Unrealized Losses | (813,000) | (800,000) |
Available for Sale, Fair Value | 10,028,000 | 10,360,000 |
Investment securities held to maturity, Cost Basis | 32,779,000 | 32,787,000 |
Investment securities held to maturity, Gross Unrealized Losses | (2,909,000) | (2,797,000) |
Investment securities held to maturity, Fair value | 29,870,000 | 29,990,000 |
Investment securities held to maturity, Allowance for credit losses | (2,000) | (2,000) | (3,000)
Corporate bonds |  |  |
Information concerning investments with unrealized gains and losses |  |  |
Investment securities available for sale, Cost Basis | 60,593,000 | 62,004,000 |
Investment securities available for sale, Gross Unrealized Gains | 57,000 | 46,000 |
Investment securities available for sale, Gross Unrealized Losses | (3,470,000) | (4,187,000) |
Investment securities available for sale, Allowance for credit losses | (116,000) | (926,000) | (926,000)
Available for Sale, Fair Value | 57,064,000 | 56,937,000 |
Corporate bonds and other securities |  |  |
Information concerning investments with unrealized gains and losses |  |  |
Investment securities held to maturity, Cost Basis | 4,415,000 | 4,470,000 |
Investment securities held to maturity, Gross Unrealized Losses | (156,000) | (173,000) |
Investment securities held to maturity, Fair value | 4,259,000 | 4,297,000 |
Investment securities held to maturity, Allowance for credit losses | $ (88,000) | $ (35,000) | $ (80,000)

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