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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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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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