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Quarterly Financial Data (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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 6,450	$ 6,212	$ 6,141	$ 5,722	$ 5,831	$ 5,624	$ 5,425	$ 5,161	$ 24,525	$ 22,041	$ 20,312
Net interest income	5,617	5,522	5,595	5,330	5,393	5,238	5,077	4,855	22,064	20,563	19,343
Net income	$ 1,828	$ 2,014	$ 1,833	$ 1,658	$ 1,367	$ 1,720	$ 1,635	$ 1,446	$ 7,333	$ 6,168	$ 6,090
Basic earnings per common share	$ 0.51	$ 0.55	$ 0.51	$ 0.46	$ 0.37	$ 0.48	$ 0.45	$ 0.40	$ 2.03	$ 1.70	$ 1.68
Fully diluted earnings per common share	$ 0.50	$ 0.55	$ 0.51	$ 0.46	$ 0.37	$ 0.48	$ 0.45	$ 0.40	$ 2.02	$ 1.70	$ 1.68

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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