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Investment Securities - cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	$ 141,110	$ 148,514
Investment securities available for sale, Gross Unrealized Gains	2,790	765
Investment securities available for sale, Gross Unrealized Losses	(500)	(2,548)
Available for Sale, Fair Value, Total	143,400	146,731
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017)	39,299	40,760
Investment securities held to maturity, Gross Unrealized Gains	1,598	222
Investment securities held to maturity, Gross Unrealized Losses	(84)	(658)
Held to Maturity, Fair Value, Total	40,813	40,324
U.S. Agency
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	6,209	7,685
Investment securities available for sale, Gross Unrealized Gains	71	4
Investment securities available for sale, Gross Unrealized Losses	0	(160)
Available for Sale, Fair Value, Total	6,280	7,529
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	83,830	90,169
Investment securities available for sale, Gross Unrealized Gains	1,760	516
Investment securities available for sale, Gross Unrealized Losses	(100)	(1,158)
Available for Sale, Fair Value, Total	85,490	89,527
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017)	9,061	9,983
Investment securities held to maturity, Gross Unrealized Gains	277	78
Investment securities held to maturity, Gross Unrealized Losses	(6)	(132)
Held to Maturity, Fair Value, Total	9,332	9,929
Corporate bonds [Member]
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	37,290	37,359
Investment securities available for sale, Gross Unrealized Gains	317	131
Investment securities available for sale, Gross Unrealized Losses	(392)	(996)
Available for Sale, Fair Value, Total	37,215	36,494
Corporate bonds and other securities [Member]
Information concerning investments with unrealized losses
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017)	6,033	6,037
Investment securities held to maturity, Gross Unrealized Gains	62	13
Investment securities held to maturity, Gross Unrealized Losses	(36)	(122)
Held to Maturity, Fair Value, Total	6,059	5,928
Municipal [Member]
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	13,781	13,301
Investment securities available for sale, Gross Unrealized Gains	642	114
Investment securities available for sale, Gross Unrealized Losses	(8)	(234)
Available for Sale, Fair Value, Total	14,415	13,181
Held to maturity (fair value $37,345 on September 30, 2018 and $38,811 on December 31, 2017)	24,205	24,740
Investment securities held to maturity, Gross Unrealized Gains	1,259	131
Investment securities held to maturity, Gross Unrealized Losses	(42)	(404)
Held to Maturity, Fair Value, Total	$ 25,422	$ 24,467

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