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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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