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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | $ 139,375 | $ 139,577
Investment securities available for sale, Gross Unrealized Gains | 4,719 | 2,564
Investment securities available for sale, Gross Unrealized Losses | (1,378) | (392)
Available for Sale, Fair Value, Total | 142,716 | 141,749
Investment securities held to maturity, Cost Basis | 42,068 | 39,936
Investment securities held to maturity, Gross Unrealized Gains | 2,224 | 1,250
Investment securities held to maturity, Gross Unrealized Losses | (56) | (104)
Held to Maturity, Fair Value, Total | 44,236 | 41,082
U.S. Agency |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 3,895 | 5,084
Investment securities available for sale, Gross Unrealized Gains | 72 | 32
Available for Sale, Fair Value, Total | 3,967 | 5,116
Municipal |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 14,925 | 14,678
Investment securities available for sale, Gross Unrealized Gains | 899 | 509
Investment securities available for sale, Gross Unrealized Losses | 0 | (17)
Available for Sale, Fair Value, Total | 15,824 | 15,170
Investment securities held to maturity, Cost Basis | 25,527 | 24,438
Investment securities held to maturity, Gross Unrealized Gains | 1,674 | 941
Investment securities held to maturity, Gross Unrealized Losses | (50) | (53)
Held to Maturity, Fair Value, Total | 27,151 | 25,326
Corporate bonds [Member] |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 41,693 | 39,769
Investment securities available for sale, Gross Unrealized Gains | 470 | 342
Investment securities available for sale, Gross Unrealized Losses | (1,322) | (281)
Available for Sale, Fair Value, Total | 40,841 | 39,830
U.S. Agency mortgage-backed securities |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 78,862 | 80,046
Investment securities available for sale, Gross Unrealized Gains | 3,278 | 1,681
Investment securities available for sale, Gross Unrealized Losses | (56) | (94)
Available for Sale, Fair Value, Total | 82,084 | 81,633
Investment securities held to maturity, Cost Basis | 10,510 | 9,466
Investment securities held to maturity, Gross Unrealized Gains | 508 | 251
Investment securities held to maturity, Gross Unrealized Losses | 0 | (4)
Held to Maturity, Fair Value, Total | 11,018 | 9,713
Corporate bonds and other securities [Member] |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities held to maturity, Cost Basis | 6,031 | 6,032
Investment securities held to maturity, Gross Unrealized Gains | 42 | 58
Investment securities held to maturity, Gross Unrealized Losses | (6) | (47)
Held to Maturity, Fair Value, Total | $ 6,067 | $ 6,043

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