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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) | Sep. 30, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities available for sale, Cost Basis | $ 194,978,000 |  |  | $ 198,417,000
Investment securities available for sale, Gross Unrealized Gains | 6,000 |  |  | 95,000
Investment securities available for sale, Gross Unrealized Losses | (25,006,000) |  |  | (19,004,000)
Investment securities available for sale, Allowance for credit losses | (926,000) |  |  |
Available for Sale, Fair Value | 169,052,000 |  |  | 179,508,000
Investment securities held to maturity, Cost Basis | 60,283,000 |  |  | 61,878,000
Investment securities held to maturity, Gross Unrealized Gains |  |  |  | 10,000
Investment securities held to maturity, Gross Unrealized Losses | (7,892,000) |  |  | (6,696,000)
Investment securities held to maturity, Allowance for credit losses | 32,000 | $ 109,000 | $ 114,000 |
Investment securities held to maturity, Fair value | 52,391,000 |  |  | 55,192,000
U.S. Agency |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities available for sale, Cost Basis | 11,575,000 |  |  | 11,797,000
Investment securities available for sale, Gross Unrealized Gains |  |  |  | 1,000
Investment securities available for sale, Gross Unrealized Losses | (1,380,000) |  |  | (1,265,000)
Available for Sale, Fair Value | 10,195,000 |  |  | 10,533,000
Investment securities held to maturity, Cost Basis | 2,500,000 |  |  | 2,500,000
Investment securities held to maturity, Gross Unrealized Losses | (513,000) |  |  | (432,000)
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |
Investment securities held to maturity, Fair value | 1,987,000 |  |  | 2,068,000
U.S. Agency mortgage-backed securities |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities available for sale, Cost Basis | 102,655,000 |  |  | 102,631,000
Investment securities available for sale, Gross Unrealized Gains | 6,000 |  |  | 64,000
Investment securities available for sale, Gross Unrealized Losses | (16,674,000) |  |  | (12,710,000)
Available for Sale, Fair Value | 85,987,000 |  |  | 89,985,000
Investment securities held to maturity, Cost Basis | 19,582,000 |  |  | 18,877,000
Investment securities held to maturity, Gross Unrealized Gains |  |  |  | 8,000
Investment securities held to maturity, Gross Unrealized Losses | (3,023,000) |  |  | (2,212,000)
Investment securities held to maturity, Allowance for credit losses | 0 |  |  |
Investment securities held to maturity, Fair value | 16,559,000 |  |  | 16,673,000
Municipal |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities available for sale, Cost Basis | 20,160,000 |  |  | 20,837,000
Investment securities available for sale, Gross Unrealized Losses | (1,801,000) |  |  | (1,799,000)
Available for Sale, Fair Value | 18,359,000 |  |  | 19,038,000
Investment securities held to maturity, Cost Basis | 33,724,000 |  |  | 33,993,000
Investment securities held to maturity, Gross Unrealized Gains |  |  |  | 2,000
Investment securities held to maturity, Gross Unrealized Losses | (4,119,000) |  |  | (3,880,000)
Investment securities held to maturity, Allowance for credit losses | 2,000 | 2,000 | 3,000 |
Investment securities held to maturity, Fair value | 29,605,000 |  |  | 30,115,000
Corporate bonds. |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities available for sale, Cost Basis | 60,588,000 |  |  | 63,152,000
Investment securities available for sale, Gross Unrealized Gains |  |  |  | 30,000
Investment securities available for sale, Gross Unrealized Losses | (5,151,000) |  |  | (3,230,000)
Investment securities available for sale, Allowance for credit losses | (926,000) |  |  |
Available for Sale, Fair Value | 54,511,000 |  |  | 59,952,000
Investment securities held to maturity, Allowance for credit losses |  |  | $ 111,000 |
Corporate bonds and other securities |  |  |  |
Information concerning investments with unrealized gains and losses |  |  |  |
Investment securities held to maturity, Cost Basis | 4,477,000 |  |  | 6,508,000
Investment securities held to maturity, Gross Unrealized Losses | (237,000) |  |  | (172,000)
Investment securities held to maturity, Allowance for credit losses | 30,000 | $ 107,000 |  |
Investment securities held to maturity, Fair value | $ 4,240,000 |  |  | $ 6,336,000

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