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Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Basic earnings per share:
Weighted-average common shares outstanding	29,600,702	29,532,510	29,476,821
Net income	$ 15,138	$ 15,684	$ 15,385
Preferred stock dividends and accretion			1,873
Preferred stock dividends and accretion of discount			1,873
Net income available to common stockholders	$ 15,138	$ 15,684	$ 13,512
Basic earnings per share (in dollars per share)	$ 0.51	$ 0.53	$ 0.46
Diluted earnings per share:
Weighted-average common shares outstanding	29,600,702	29,532,510	29,476,821
Diluted average common shares outstanding	30,038,417	29,838,931	29,730,074
Net earnings available to common stockholders	$ 15,138	$ 15,684	$ 13,512
Diluted earnings per share (in dollars per share)	$ 0.50	$ 0.53	$ 0.46
One 10 year warrant	815,339	900,839	977,839
Warrants
Diluted earnings per share:
One 10 year warrant				815,339
Warrants, exercise price (in dollars per share)	$ 13.43			$ 13.43
Restricted stock and restricted stock units
Diluted earnings per share:
Dilutive effect of nonvested restricted awards (in shares)	435,142	305,678	253,253
Stock options
Diluted earnings per share:
Dilutive effect of nonvested restricted awards (in shares)	2,573	743

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