Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income	$ 17,704	$ 17,407	$ 21,030
Earnings allocated to participating securities	(279)	(258)	(253)
Numerator for earnings per common share	$ 17,425	$ 17,149	$ 20,777
Denominator:
Denominator for basic earnings per common share	18,660,951	18,975,450	19,417,486
Effect of dilutive securities:
Stock compensation	205,916	148,059	142,877
Denominator for diluted earnings per common share	18,866,867	19,123,509	19,560,363
Earnings per common share:
Basic	$ 0.93	$ 0.90	$ 1.07
Diluted	$ 0.92	$ 0.90	$ 1.06
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,573	38,145	0