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Earnings Per Common Share (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
Basic earnings per common share
Net income	$ 3,968	$ 2,665	$ 3,723	$ 4,553	$ 4,083	$ 4,381	$ 3,858	$ 4,192	$ 14,909	$ 16,514	$ 14,139
less: earnings allocated to participating securities									219	273	294
Earnings allocated to common shareholders									$ 14,690	$ 16,241	$ 13,845
Weighted-average common shares outstanding, excluding participating securities									8,573,722	8,549,176	7,869,956
Basic earnings per common share	$ 0.46	$ 0.31	$ 0.43	$ 0.52	$ 0.47	$ 0.50	$ 0.45	$ 0.48	$ 1.71	$ 1.90	$ 1.76
Diluted earnings per common share
Earnings allocated to common shareholders									$ 14,690	$ 16,241	$ 13,845
Reallocation of undistributed earnings									0	0	1
Diluted earnings allocated to common shareholders									$ 14,690	$ 16,241	$ 13,846
Weighted-average common shares outstanding, excluding participating securities									8,573,722	8,549,176	7,869,956
Dilutive effect of share-based awards									0	1,146	36,811
Weighted-average diluted common shares outstanding, excluding participating securities									8,573,722	8,550,322	7,906,767
Diluted earnings per common share	$ 0.46	$ 0.31	$ 0.43	$ 0.52	$ 0.47	$ 0.50	$ 0.45	$ 0.48	$ 1.71	$ 1.90	$ 1.75

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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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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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