Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per share:
Net income	$ 6,564	$ 6,264
Weighted-average common shares outstanding (in shares)	15,999,464	13,418,259
Basic earnings per share (in dollars per share)	$ 0.41	$ 0.47
Diluted earnings per share:
Net income	$ 6,564	$ 6,264
Weighted-average common shares outstanding (in shares)	15,999,464	13,418,259
Diluted effect of stock options (in shares)	271,805	168,500
Diluted weighted-average common shares outstanding (in shares)	16,271,269	13,586,759
Diluted earnings per share (in shares)	$ 0.40	$ 0.46
Stock options excluded in computing diluted earnings per share	15,000	0