Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Quarterly Results of Operations (Unaudited)
Interest income	$ 3,844	$ 3,862	$ 3,543	$ 3,444	$ 3,466	$ 3,434	$ 3,383	$ 3,324	$ 14,693	$ 13,607
Interest expense	599	560	490	452	460	499	487	491	2,102	1,937
Net interest income	3,245	3,302	3,053	2,992	3,006	2,935	2,896	2,833	12,591	11,670
Provision for credit losses	255	246	(5)	360	93	78	(30)	195	856	336
Net securities gains							1			1
Income before income taxes	365	631	433	283	565	512	401	346	1,713	1,824
Net income	$ 307	$ 542	$ 478	$ 255	$ (152)	$ 411	$ 338	$ 316	$ 1,583	$ 911
Net income per share (basic and diluted)	$ 0.11	$ 0.19	$ 0.17	$ 0.09	$ (0.05)	$ 0.15	$ 0.12	$ 0.11	$ 0.56	$ 0.33

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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