Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic:
Net income	$ 5,781	$ 8,186	$ 18,765	$ 24,033
Weighted-average common shares outstanding	14,348,151	14,417,725	14,373,243	14,435,670
Basic earnings per share	$ 0.40	$ 0.57	$ 1.31	$ 1.66
Diluted:
Net Income	$ 5,781	$ 8,186	$ 18,765	$ 24,033
Weighted-average common shares outstanding	14,348,151	14,417,725	14,373,243	14,435,670
Effect of dilutive restricted stock and stock appreciation rights	198,336	262,917	200,723	258,123
Weighted-average common shares outstanding assuming dilution	14,546,487	14,680,642	14,573,966	14,693,793
Diluted earnings per share	$ 0.40	$ 0.56	$ 1.29	$ 1.64