Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic:
Net income	$ 7,684	$ 7,509	$ 15,847	$ 15,601
Weighted-average common shares outstanding	14,434,232	14,687,882	14,444,821	14,683,773
Basic earnings per share	$ 0.53	$ 0.51	$ 1.10	$ 1.06
Diluted:
Net Income	$ 7,684	$ 7,509	$ 15,847	$ 15,601
Weighted-average common shares outstanding	14,434,232	14,687,882	14,444,821	14,683,773
Effect of dilutive restricted stock and stock appreciation rights	258,032	246,330	255,613	236,666
Weighted-average common shares outstanding assuming dilution	14,692,264	14,934,212	14,700,434	14,920,439
Diluted earnings per share	$ 0.52	$ 0.50	$ 1.08	$ 1.05