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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | $ 137,272 | $ 139,577
Investment securities available for sale, Gross Unrealized Gains | 4,846 | 2,564
Investment securities available for sale, Gross Unrealized Losses | (402) | (392)
Available for Sale, Fair Value, Total | 141,716 | 141,749
Investment securities held to maturity, Cost Basis | 42,636 | 39,936
Investment securities held to maturity, Gross Unrealized Gains | 2,727 | 1,250
Investment securities held to maturity, Gross Unrealized Losses | (55) | (104)
Held to Maturity, Fair Value, Total | 45,308 | 41,082
U.S. Agency |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 3,079 | 5,084
Investment securities available for sale, Gross Unrealized Gains | 197 | 32
Available for Sale, Fair Value, Total | 3,276 | 5,116
U.S. Agency mortgage-backed securities |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 66,198 | 80,046
Investment securities available for sale, Gross Unrealized Gains | 2,850 | 1,681
Investment securities available for sale, Gross Unrealized Losses | (6) | (94)
Available for Sale, Fair Value, Total | 69,042 | 81,633
Investment securities held to maturity, Cost Basis | 7,719 | 9,466
Investment securities held to maturity, Gross Unrealized Gains | 394 | 251
Investment securities held to maturity, Gross Unrealized Losses |  | (4)
Held to Maturity, Fair Value, Total | 8,113 | 9,713
Municipal |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 17,409 | 14,678
Investment securities available for sale, Gross Unrealized Gains | 1,242 | 509
Investment securities available for sale, Gross Unrealized Losses |  | (17)
Available for Sale, Fair Value, Total | 18,651 | 15,170
Investment securities held to maturity, Cost Basis | 28,889 | 24,438
Investment securities held to maturity, Gross Unrealized Gains | 2,225 | 941
Investment securities held to maturity, Gross Unrealized Losses | (51) | (53)
Held to Maturity, Fair Value, Total | 31,063 | 25,326
Corporate bonds |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 50,586 | 39,769
Investment securities available for sale, Gross Unrealized Gains | 557 | 342
Investment securities available for sale, Gross Unrealized Losses | (396) | (281)
Available for Sale, Fair Value, Total | 50,747 | 39,830
Corporate bonds and other securities |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities held to maturity, Cost Basis | 6,028 | 6,032
Investment securities held to maturity, Gross Unrealized Gains | 108 | 58
Investment securities held to maturity, Gross Unrealized Losses | (4) | (47)
Held to Maturity, Fair Value, Total | $ 6,132 | $ 6,043

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