Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Earnings Per Share [Abstract]
Net income	$ 5,941	$ 5,426	$ 5,272	$ 5,103	$ 5,838	$ 5,063	$ 4,739	$ 4,400	$ 21,742	$ 20,040	$ 16,891
Weighted Average Number of Shares Outstanding, Basic									16,050	16,004	16,582
Weighted Average Number of Shares, Restricted Stock									46	38	47
Weighted Average Number of Shares Outstanding, Diluted									16,096	16,042	16,629
Basic earnings per common share	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 0.36	$ 0.32	$ 0.30	$ 0.28	$ 1.35	$ 1.25	$ 1.02
Diluted earnings per common share	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 0.36	$ 0.32	$ 0.30	$ 0.27	$ 1.35	$ 1.25	$ 1.02
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									139,500	0	0