Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (loss)	Accumulated Other Comprehensive Income (loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2018	$ 827,373			$ 541,762		$ 303,490			$ (17,879)
Beginning balance (in shares) at Dec. 31, 2018				30,417,223
Net income	92,072					92,072
Other comprehensive income (loss)	12,657								12,657
Service condition RSU vesting	1,161			$ 1,161
Market plus service condition RSU vesting	493			493
Stock options exercised	2,921			$ 2,921
Stock options exercised (in shares)				182,500
Service condition RSUs released (in shares)				33,060
Tax benefit from release of service condition RSUs (in shares)				22,237
Repurchase of common stock	$ (5,108)			$ (2,339)		(2,769)
Repurchase of common stock (in shares)	0			(131,196)
Dividends paid	$ (24,999)					(24,999)
Accounting Standards Update [Extensible Enumeration]	ASU 2016-13
Ending balance at Dec. 31, 2019	$ 906,570	$ (12,983)	$ 893,587	$ 543,998	$ 543,998	367,794	$ (12,983)	$ 354,811	(5,222)	$ (5,222)
Ending balance (in shares) at Dec. 31, 2019				30,523,824	30,523,824
Net income	64,814					64,814
Other comprehensive income (loss)	17,502								17,502
Service condition RSU vesting	1,390			$ 1,390
Market plus service condition RSU vesting	646			646
Stock options exercised	$ 547			$ 547
Stock options exercised (in shares)	32,000			32,000
Service condition RSUs released (in shares)				34,388
Market plus service conditions RSUs released (in shares)				20,265
Repurchase of common stock	$ (27,069)			$ (15,746)		(11,323)
Repurchase of common stock (in shares)				(883,263)
Dividends paid	(26,303)					(26,303)
Ending balance at Dec. 31, 2020	$ 925,114			$ 530,835		381,999			12,280
Ending balance (in shares) at Dec. 31, 2020	29,727,214			29,727,214
Net income	$ 117,655					117,655
Other comprehensive income (loss)	(11,299)								(11,299)
Service condition RSU vesting	1,728			$ 1,728
Market plus service condition RSU vesting	910			910
Stock options exercised	$ 758			$ 758
Stock options exercised (in shares)	49,675			49,675
Service condition RSUs released (in shares)				45,492
Market plus service conditions RSUs released (in shares)				19,272
Repurchase of common stock	$ (4,958)			$ (1,987)		(2,971)
Repurchase of common stock (in shares)				(111,229)
Dividends paid	(29,724)					(29,724)
Ending balance at Dec. 31, 2021	$ 1,000,184			$ 532,244		$ 466,959			$ 981
Ending balance (in shares) at Dec. 31, 2021	29,730,424			29,730,424