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Investment Securities - cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | $ 141,110 | $ 148,514
Investment securities available for sale, Gross Unrealized Gains | 2,790 | 765
Investment securities available for sale, Gross Unrealized Losses | (500) | (2,548)
Available for Sale, Fair Value, Total | 143,400 | 146,731
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017) | 39,299 | 40,760
Investment securities held to maturity, Gross Unrealized Gains | 1,598 | 222
Investment securities held to maturity, Gross Unrealized Losses | (84) | (658)
Held to Maturity, Fair Value, Total | 40,813 | 40,324
U.S. Agency |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 6,209 | 7,685
Investment securities available for sale, Gross Unrealized Gains | 71 | 4
Investment securities available for sale, Gross Unrealized Losses | 0 | (160)
Available for Sale, Fair Value, Total | 6,280 | 7,529
U.S. Agency mortgage-backed securities |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 83,830 | 90,169
Investment securities available for sale, Gross Unrealized Gains | 1,760 | 516
Investment securities available for sale, Gross Unrealized Losses | (100) | (1,158)
Available for Sale, Fair Value, Total | 85,490 | 89,527
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017) | 9,061 | 9,983
Investment securities held to maturity, Gross Unrealized Gains | 277 | 78
Investment securities held to maturity, Gross Unrealized Losses | (6) | (132)
Held to Maturity, Fair Value, Total | 9,332 | 9,929
Corporate bonds [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 37,290 | 37,359
Investment securities available for sale, Gross Unrealized Gains | 317 | 131
Investment securities available for sale, Gross Unrealized Losses | (392) | (996)
Available for Sale, Fair Value, Total | 37,215 | 36,494
Corporate bonds and other securities [Member] |  |
Information concerning investments with unrealized losses |  |
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017) | 6,033 | 6,037
Investment securities held to maturity, Gross Unrealized Gains | 62 | 13
Investment securities held to maturity, Gross Unrealized Losses | (36) | (122)
Held to Maturity, Fair Value, Total | 6,059 | 5,928
Municipal [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 13,781 | 13,301
Investment securities available for sale, Gross Unrealized Gains | 642 | 114
Investment securities available for sale, Gross Unrealized Losses | (8) | (234)
Available for Sale, Fair Value, Total | 14,415 | 13,181
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017) | 24,205 | 24,740
Investment securities held to maturity, Gross Unrealized Gains | 1,259 | 131
Investment securities held to maturity, Gross Unrealized Losses | (42) | (404)
Held to Maturity, Fair Value, Total | $ 25,422 | $ 24,467

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