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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 137,272	$ 139,577
Investment securities available for sale, Gross Unrealized Gains	4,846	2,564
Investment securities available for sale, Gross Unrealized Losses	(402)	(392)
Available for Sale, Fair Value, Total	141,716	141,749
Investment securities held to maturity, Cost Basis	42,636	39,936
Investment securities held to maturity, Gross Unrealized Gains	2,727	1,250
Investment securities held to maturity, Gross Unrealized Losses	(55)	(104)
Held to Maturity, Fair Value, Total	45,308	41,082
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	3,079	5,084
Investment securities available for sale, Gross Unrealized Gains	197	32
Available for Sale, Fair Value, Total	3,276	5,116
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	66,198	80,046
Investment securities available for sale, Gross Unrealized Gains	2,850	1,681
Investment securities available for sale, Gross Unrealized Losses	(6)	(94)
Available for Sale, Fair Value, Total	69,042	81,633
Investment securities held to maturity, Cost Basis	7,719	9,466
Investment securities held to maturity, Gross Unrealized Gains	394	251
Investment securities held to maturity, Gross Unrealized Losses		(4)
Held to Maturity, Fair Value, Total	8,113	9,713
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	17,409	14,678
Investment securities available for sale, Gross Unrealized Gains	1,242	509
Investment securities available for sale, Gross Unrealized Losses		(17)
Available for Sale, Fair Value, Total	18,651	15,170
Investment securities held to maturity, Cost Basis	28,889	24,438
Investment securities held to maturity, Gross Unrealized Gains	2,225	941
Investment securities held to maturity, Gross Unrealized Losses	(51)	(53)
Held to Maturity, Fair Value, Total	31,063	25,326
Corporate bonds
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	50,586	39,769
Investment securities available for sale, Gross Unrealized Gains	557	342
Investment securities available for sale, Gross Unrealized Losses	(396)	(281)
Available for Sale, Fair Value, Total	50,747	39,830
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	6,028	6,032
Investment securities held to maturity, Gross Unrealized Gains	108	58
Investment securities held to maturity, Gross Unrealized Losses	(4)	(47)
Held to Maturity, Fair Value, Total	$ 6,132	$ 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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