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INVESTMENT SECURITIES - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | $ 139,577 | $ 148,514
Investment securities available for sale, Gross Unrealized Gains | 2,564 | 765
Investment securities available for sale, Gross Unrealized Losses | (392) | (2,548)
Available for Sale, Fair Value, Total | 141,749 | 146,731
Investment securities held to maturity, Cost Basis | 39,936 | 40,760
Investment securities held to maturity, Gross Unrealized Gains | 1,250 | 222
Investment securities held to maturity, Gross Unrealized Losses | (104) | (658)
Held to Maturity, Fair Value, Total | 41,082 | 40,324
U.S. Agency |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 5,084 | 7,685
Investment securities available for sale, Gross Unrealized Gains | 32 | 4
Investment securities available for sale, Gross Unrealized Losses |  | (160)
Available for Sale, Fair Value, Total | 5,116 | 7,529
Municipal |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 14,678 | 13,301
Investment securities available for sale, Gross Unrealized Gains | 509 | 114
Investment securities available for sale, Gross Unrealized Losses | (17) | (234)
Available for Sale, Fair Value, Total | 15,170 | 13,181
Investment securities held to maturity, Cost Basis | 24,438 | 24,740
Investment securities held to maturity, Gross Unrealized Gains | 941 | 131
Investment securities held to maturity, Gross Unrealized Losses | (53) | (404)
Held to Maturity, Fair Value, Total | 25,326 | 24,467
Corporate bonds [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 39,769 | 37,359
Investment securities available for sale, Gross Unrealized Gains | 342 | 131
Investment securities available for sale, Gross Unrealized Losses | (281) | (996)
Available for Sale, Fair Value, Total | 39,830 | 36,494
U.S. Agency mortgage-backed securities |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Cost Basis | 80,046 | 90,169
Investment securities available for sale, Gross Unrealized Gains | 1,681 | 516
Investment securities available for sale, Gross Unrealized Losses | (94) | (1,158)
Available for Sale, Fair Value, Total | 81,633 | 89,527
Investment securities held to maturity, Cost Basis | 9,466 | 9,983
Investment securities held to maturity, Gross Unrealized Gains | 251 | 78
Investment securities held to maturity, Gross Unrealized Losses | (4) | (132)
Held to Maturity, Fair Value, Total | 9,713 | 9,929
Corporate bonds and other securities [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities held to maturity, Cost Basis | 6,032 | 6,037
Investment securities held to maturity, Gross Unrealized Gains | 58 | 13
Investment securities held to maturity, Gross Unrealized Losses | (47) | (122)
Held to Maturity, Fair Value, Total | $ 6,043 | $ 5,928

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