Earnings Per Share ("EPS") (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
Calculation of both basic and diluted earnings (loss) per common share
Net income	$ 4,550	$ 4,183	$ 4,215	$ 3,985	$ 3,478	$ 4,002	$ 3,800	$ 4,069	$ 16,933	$ 15,349	$ 8,965
Less: dividends and accretion on preferred stock							$ (70)			(70)	(168)
Less: net income allocated to participating securities									(90)	(83)	(63)
Net income allocated to common shareholders									$ 16,843	$ 15,196	$ 8,734
Weighted average shares outstanding									34,051,171	34,129,930	32,567,137
Basic earnings per common share (in dollars per share)	$ 0.13	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.12	$ 0.11	$ 0.12	$ 0.49	$ 0.45	$ 0.27
Dilutive effect of share-based compensation awards (in shares)									136,350	144,972	145,846
Weighted average diluted shares outstanding									34,187,521	34,274,902	32,712,983
Diluted earnings per common share (in dollars per share)	$ 0.13	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.12	$ 0.11	$ 0.12	$ 0.49	$ 0.44	$ 0.27
Stock options
Shares excluded from the calculation of diluted earnings per share
Shares excluded from the calculation of diluted earnings per share									62,000	120,000	99,000