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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 139,056	$ 139,577
Investment securities available for sale, Gross Unrealized Gains	4,949	2,564
Investment securities available for sale, Gross Unrealized Losses	(646)	(392)
Available for Sale, Fair Value, Total	143,359	141,749
Investment securities held to maturity, Cost Basis	41,549	39,936
Investment securities held to maturity, Gross Unrealized Gains	2,497	1,250
Investment securities held to maturity, Gross Unrealized Losses	(57)	(104)
Held to Maturity, Fair Value, Total	43,989	41,082
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	3,175	5,084
Investment securities available for sale, Gross Unrealized Gains	182	32
Investment securities available for sale, Gross Unrealized Losses	0	0
Available for Sale, Fair Value, Total	3,357	5,116
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	72,802	80,046
Investment securities available for sale, Gross Unrealized Gains	3,238	1,681
Investment securities available for sale, Gross Unrealized Losses	(2)	(94)
Available for Sale, Fair Value, Total	76,038	81,633
Investment securities held to maturity, Cost Basis	9,852	9,466
Investment securities held to maturity, Gross Unrealized Gains	472	251
Investment securities held to maturity, Gross Unrealized Losses	0	(4)
Held to Maturity, Fair Value, Total	10,324	9,713
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	15,222	14,678
Investment securities available for sale, Gross Unrealized Gains	1,086	509
Investment securities available for sale, Gross Unrealized Losses	0	(17)
Available for Sale, Fair Value, Total	16,308	15,170
Investment securities held to maturity, Cost Basis	25,668	24,438
Investment securities held to maturity, Gross Unrealized Gains	1,918	941
Investment securities held to maturity, Gross Unrealized Losses	(51)	(53)
Held to Maturity, Fair Value, Total	27,535	25,326
Corporate bonds
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	47,857	39,769
Investment securities available for sale, Gross Unrealized Gains	443	342
Investment securities available for sale, Gross Unrealized Losses	(644)	(281)
Available for Sale, Fair Value, Total	47,656	39,830
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	6,029	6,032
Investment securities held to maturity, Gross Unrealized Gains	107	58
Investment securities held to maturity, Gross Unrealized Losses	(6)	(47)
Held to Maturity, Fair Value, Total	$ 6,130	$ 6,043

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