Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Calculation of both basic and diluted earnings (loss) per common share
Net income	$ 4,215	$ 3,800	$ 8,200	$ 7,869
Accretion on preferred stock		(70)		(70)
Net income allocated to participating securities	(25)	(21)	(43)	(45)
Net income allocated to common shareholders	$ 4,190	$ 3,709	$ 8,157	$ 7,754
Weighted average shares outstanding	33,998,644	34,105,192	34,047,511	34,086,786
Basic earnings per common share (in dollars per share)	$ 0.12	$ 0.11	$ 0.24	$ 0.23
Dilutive effect of share-based compensation awards (in shares)	142,342	144,399	129,076	150,109
Weighted average diluted shares outstanding	34,140,986	34,249,591	34,176,587	34,236,895
Diluted earnings per common share (in dollars per share)	$ 0.12	$ 0.11	$ 0.24	$ 0.23
Stock options
Shares excluded from the calculation of diluted earnings per share
Shares excluded from the calculation of diluted earnings per share	65,000	88,000	99,000	408,000