Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share
Net income	$ 16,500	$ 16,404	$ 15,419
Weighted average shares outstanding (in shares)	17,988,670	10,586,394	10,513,008
Basic earnings per share (in dollars per share)	$ 0.92	$ 1.55	$ 1.46
Effect of dilutive securities:
Stock options and warrants (in shares)	87,634	91,167	68,863
Diluted earnings per share
Net income	$ 16,500	$ 16,404	$ 15,419
Weighted average shares outstanding (in shares)	18,076,304	10,677,561	10,581,871
Diluted earnings per share (in dollars per share)	$ 0.92	$ 1.54	$ 1.46