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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 5,186	$ 5,168	$ 5,037	$ 4,921	$ 4,904	$ 4,870	$ 4,832	$ 4,746	$ 20,312	$ 19,352	$ 19,014
Net interest income	4,943	4,931	4,789	4,680	4,670	4,624	4,578	4,490	19,343	18,362	17,863
Net income	$ 1,688	$ 1,683	$ 1,445	$ 1,274	$ 1,222	$ 1,449	$ 1,430	$ 1,642	$ 6,090	$ 5,743	$ 5,695
Basic earnings per common share	$ 0.51	$ 0.52	$ 0.43	$ 0.39	$ 0.37	$ 0.44	$ 0.44	$ 0.50	$ 1.85	$ 1.75	$ 1.73
Fully diluted earnings per common share	$ 0.51	$ 0.52	$ 0.43	$ 0.39	$ 0.37	$ 0.44	$ 0.43	$ 0.50	$ 1.85	$ 1.74	$ 1.72

X

- Definition

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

+ References

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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