Earnings per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 20,801	$ 20,911	$ 54,284	$ 74,389
Net income allocated to unvested restricted stock awards	0	0	0	(28)
Net income allocated to common shares	$ 20,801	$ 20,911	$ 54,284	$ 74,361
Weighted average shares outstanding	29,291	29,420	29,440	29,380
Average unvested restricted stock awards	0	0	0	(10)
Denominator for basic earnings per share—weighted-average shares outstanding	29,291	29,420	29,440	29,370
Effect of dilutive securities—employee stock options and restricted stock units	141	142	148	143
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding	29,432	29,562	29,588	29,513
Basic (in dollars per share)	$ 0.71	$ 0.71	$ 1.85	$ 2.53
Diluted earnings per share	$ 0.71	$ 0.71	$ 1.84	$ 2.52
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share	250	286	250	289