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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic earnings per common share
Net income	$ 4,083	$ 4,381	$ 3,858	$ 4,192	$ 3,744	$ 3,553	$ 3,505	$ 3,337	$ 16,514	$ 14,139	$ 13,746
less: earnings allocated to participating securities									273	294	331
Earnings allocated to common shareholders									$ 16,241	$ 13,845	$ 13,415
Weighted-average common shares outstanding, excluding participating securities									8,549,176	7,869,956	7,664,620
Basic earnings per common share	$ 0.47	$ 0.50	$ 0.45	$ 0.48	$ 0.44	$ 0.45	$ 0.44	$ 0.43	$ 1.90	$ 1.76	$ 1.75
Diluted earnings per common share
Earnings allocated to common shareholders									$ 16,241	$ 13,845	$ 13,415
Reallocation of undistributed earnings									0	1	2
Diluted earnings allocated to common shareholders									$ 16,241	$ 13,846	$ 13,417
Weighted-average common shares outstanding, excluding participating securities									8,549,176	7,869,956	7,664,620
Dilutive effect of share-based awards									1,146	36,811	30,168
Weighted-average diluted common shares outstanding, excluding participating securities									8,550,322	7,906,767	7,694,788
Diluted earnings per common share	$ 0.47	$ 0.50	$ 0.45	$ 0.48	$ 0.44	$ 0.45	$ 0.44	$ 0.42	$ 1.90	$ 1.75	$ 1.74

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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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