Earnings Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
BASIC
Net income	$ 6,993	$ 5,846
Weighted-average common shares outstanding (in shares)	13,803	13,960
Basic earnings (loss) per share (in dollars per share)	$ 0.51	$ 0.42
DILUTED
Net income	$ 6,993	$ 5,846
Weighted-average common shares outstanding (in shares)	13,803	13,960
Dilutive effect of stock options, restricted stock and common stock warrants (in shares)	396	251
Weighted-average common shares outstanding on a diluted basis (in shares)	14,199	14,211
Diluted earnings (loss) per share (in dollars per share)	$ 0.49	$ 0.41