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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 157,318	$ 139,684
Investment securities available for sale, Gross Unrealized Gains	3,996	4,728
Investment securities available for sale, Gross Unrealized Losses	(961)	(247)
Available for Sale, Fair Value, Total	160,353	144,165
Investment securities held to maturity, Cost Basis	53,942	44,222
Investment securities held to maturity, Gross Unrealized Gains	2,325	2,937
Investment securities held to maturity, Gross Unrealized Losses	(197)	(53)
Held to Maturity, Fair Value, Total	56,070	47,106
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	7,536	2,971
Investment securities available for sale, Gross Unrealized Gains	127	181
Investment securities available for sale, Gross Unrealized Losses	(28)
Available for Sale, Fair Value, Total	7,635	3,152
Investment securities held to maturity, Cost Basis	2,500
Held to Maturity, Fair Value, Total	2,500
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	77,963	65,398
Investment securities available for sale, Gross Unrealized Gains	1,610	2,533
Investment securities available for sale, Gross Unrealized Losses	(813)	(18)
Available for Sale, Fair Value, Total	78,760	67,913
Investment securities held to maturity, Cost Basis	11,078	8,119
Investment securities held to maturity, Gross Unrealized Gains	272	369
Investment securities held to maturity, Gross Unrealized Losses	(101)
Held to Maturity, Fair Value, Total	11,249	8,488
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	19,258	19,000
Investment securities available for sale, Gross Unrealized Gains	1,062	1,348
Investment securities available for sale, Gross Unrealized Losses	(18)
Available for Sale, Fair Value, Total	20,302	20,348
Investment securities held to maturity, Cost Basis	32,856	30,076
Investment securities held to maturity, Gross Unrealized Gains	1,973	2,455
Investment securities held to maturity, Gross Unrealized Losses	(95)	(49)
Held to Maturity, Fair Value, Total	34,734	32,482
Corporate bonds
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	52,561	52,315
Investment securities available for sale, Gross Unrealized Gains	1,197	666
Investment securities available for sale, Gross Unrealized Losses	(102)	(229)
Available for Sale, Fair Value, Total	53,656	52,752
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	7,508	6,027
Investment securities held to maturity, Gross Unrealized Gains	80	113
Investment securities held to maturity, Gross Unrealized Losses	(1)	(4)
Held to Maturity, Fair Value, Total	$ 7,587	$ 6,136

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