Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Quarterly Results of Operations (Unaudited)
Interest income	$ 3,641	$ 3,590	$ 3,574	$ 3,709	$ 3,844	$ 3,862	$ 3,543	$ 3,444	$ 14,514	$ 14,693
Interest expense	461	446	450	570	599	560	490	452	1,927	2,102
Net interest income	3,180	3,144	3,124	3,139	3,245	3,302	3,053	2,992	12,587	12,591
Provision for credit losses	(179)	(139)	30	173	255	246	(5)	360	(115)	856
Net securities gains				3					3
Income before income taxes	676	818	386	171	365	528	433	283	2,051	1,713
Net income	$ 539	$ 606	$ 319	$ 135	$ 307	$ 439	$ 478	$ 255	$ 1,599	$ 1,583
Net income per share (basic and diluted)	$ 0.19	$ 0.21	$ 0.11	$ 0.05	$ 0.11	$ 0.16	$ 0.17	$ 0.09	$ 0.57	$ 0.56

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

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