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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per common share
Net income	$ 4,037	$ 2,584	$ 1,886	$ 3,397	$ 3,968	$ 2,665	$ 3,723	$ 4,553	$ 11,905	$ 14,909	$ 16,514
less: earnings allocated to participating securities									162	219	273
Basic earnings allocated to common shareholders									$ 11,743	$ 14,690	$ 16,241
Weighted-average common shares outstanding, excluding participating securities									8,612,770	8,573,722	8,549,176
Basic earnings per common share	$ 0.46	$ 0.30	$ 0.22	$ 0.39	$ 0.46	$ 0.31	$ 0.43	$ 0.52	$ 1.36	$ 1.71	$ 1.90
Diluted earnings per common share
Diluted earnings allocated to common shareholders									$ 11,743	$ 14,690	$ 16,241
Weighted-average common shares outstanding, excluding participating securities									8,612,770	8,573,722	8,549,176
Dilutive effect of share-based awards									0	0	1,146
Weighted-average diluted common shares outstanding, excluding participating securities									8,612,770	8,573,722	8,550,322
Diluted earnings per common share	$ 0.46	$ 0.30	$ 0.22	$ 0.39	$ 0.46	$ 0.31	$ 0.43	$ 0.52	$ 1.36	$ 1.71	$ 1.90

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- Definition

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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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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