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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 170,530	$ 161,416
Investment securities available for sale, Gross Unrealized Gains	790	3,167
Investment securities available for sale, Gross Unrealized Losses	(6,453)	(1,412)
Available for Sale, Fair Value, Total	164,867	163,171
Investment securities held to maturity, Cost Basis	58,419	53,751
Investment securities held to maturity, Gross Unrealized Gains	491	2,001
Investment securities held to maturity, Gross Unrealized Losses	(1,789)	(236)
Held to Maturity, Fair Value, Total	57,121	55,516
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	9,674	7,371
Investment securities available for sale, Gross Unrealized Gains		86
Investment securities available for sale, Gross Unrealized Losses	(459)	(70)
Available for Sale, Fair Value, Total	9,215	7,387
Investment securities held to maturity, Cost Basis	2,500	2,500
Investment securities held to maturity, Gross Unrealized Losses	(165)	(11)
Held to Maturity, Fair Value, Total	2,335	2,489
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	85,978	80,136
Investment securities available for sale, Gross Unrealized Gains	227	1,202
Investment securities available for sale, Gross Unrealized Losses	(4,820)	(1,171)
Available for Sale, Fair Value, Total	81,385	80,167
Investment securities held to maturity, Cost Basis	14,117	10,556
Investment securities held to maturity, Gross Unrealized Gains	43	203
Investment securities held to maturity, Gross Unrealized Losses	(707)	(115)
Held to Maturity, Fair Value, Total	13,453	10,644
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	21,543	20,066
Investment securities available for sale, Gross Unrealized Gains	153	851
Investment securities available for sale, Gross Unrealized Losses	(488)	(25)
Available for Sale, Fair Value, Total	21,208	20,892
Investment securities held to maturity, Cost Basis	34,295	33,188
Investment securities held to maturity, Gross Unrealized Gains	438	1,734
Investment securities held to maturity, Gross Unrealized Losses	(877)	(103)
Held to Maturity, Fair Value, Total	33,856	34,819
Corporate bonds.
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	53,335	53,843
Investment securities available for sale, Gross Unrealized Gains	410	1,028
Investment securities available for sale, Gross Unrealized Losses	(686)	(146)
Available for Sale, Fair Value, Total	53,059	54,725
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	7,507	7,507
Investment securities held to maturity, Gross Unrealized Gains	10	64
Investment securities held to maturity, Gross Unrealized Losses	(40)	(7)
Held to Maturity, Fair Value, Total	$ 7,477	$ 7,564

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