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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | $ 153,443 | $ 139,684
Investment securities available for sale, Gross Unrealized Gains | 4,154 | 4,728
Investment securities available for sale, Gross Unrealized Losses | (1,181) | (247)
Available for Sale, Fair Value, Total | 156,416 | 144,165
Investment securities held to maturity, Cost Basis | 47,777 | 44,222
Investment securities held to maturity, Gross Unrealized Gains | 2,187 | 2,937
Investment securities held to maturity, Gross Unrealized Losses | (381) | (53)
Held to Maturity, Fair Value, Total | 49,583 | 47,106
U.S. Agency |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 6,786 | 2,971
Investment securities available for sale, Gross Unrealized Gains | 135 | 181
Investment securities available for sale, Gross Unrealized Losses | (33) |
Available for Sale, Fair Value, Total | 6,888 | 3,152
Investment securities held to maturity, Cost Basis | 1,500 |
Held to Maturity, Fair Value, Total | 1,500 |
U.S. Agency mortgage-backed securities |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 75,758 | 65,398
Investment securities available for sale, Gross Unrealized Gains | 2,016 | 2,533
Investment securities available for sale, Gross Unrealized Losses | (899) | (18)
Available for Sale, Fair Value, Total | 76,875 | 67,913
Investment securities held to maturity, Cost Basis | 9,317 | 8,119
Investment securities held to maturity, Gross Unrealized Gains | 311 | 369
Investment securities held to maturity, Gross Unrealized Losses | (91) |
Held to Maturity, Fair Value, Total | 9,537 | 8,488
Municipal |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 19,859 | 19,000
Investment securities available for sale, Gross Unrealized Gains | 1,001 | 1,348
Investment securities available for sale, Gross Unrealized Losses | (83) |
Available for Sale, Fair Value, Total | 20,777 | 20,348
Investment securities held to maturity, Cost Basis | 30,935 | 30,076
Investment securities held to maturity, Gross Unrealized Gains | 1,797 | 2,455
Investment securities held to maturity, Gross Unrealized Losses | (261) | (49)
Held to Maturity, Fair Value, Total | 32,471 | 32,482
Corporate bonds |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities available for sale, Cost Basis | 51,040 | 52,315
Investment securities available for sale, Gross Unrealized Gains | 1,002 | 666
Investment securities available for sale, Gross Unrealized Losses | (166) | (229)
Available for Sale, Fair Value, Total | 51,876 | 52,752
Corporate bonds and other securities |  |
Information concerning investments with unrealized gains and losses |  |
Investment securities held to maturity, Cost Basis | 6,025 | 6,027
Investment securities held to maturity, Gross Unrealized Gains | 79 | 113
Investment securities held to maturity, Gross Unrealized Losses | (29) | (4)
Held to Maturity, Fair Value, Total | $ 6,075 | $ 6,136

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