Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020		56,200,487
Beginning balance at Dec. 31, 2020	$ 2,132,733	$ 296,483	$ (101,554)	$ 1,296,963	$ 615,773	$ 25,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,908				57,908
Other comprehensive loss	(4,929)					(4,929)
Comprehensive (loss) income	52,979
Cash dividends	(12,564)				(12,564)
Issuance of common stock for stock-based compensation awards (in shares)		93,859
Issuance of common stock for stock-based compensation awards	(2,203)		2,605	(4,808)
Stock-based compensation expense	2,756			2,756
Ending balance (in shares) at Mar. 31, 2021		56,294,346
Ending balance at Mar. 31, 2021	2,173,701	$ 296,483	(98,949)	1,294,911	661,117	20,139
Beginning balance (in shares) at Dec. 31, 2021		55,756,233
Beginning balance at Dec. 31, 2021	2,209,853	$ 296,483	(118,027)	1,300,192	741,648	(10,443)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,547				33,547
Other comprehensive loss	(94,126)					(94,126)
Comprehensive (loss) income	(60,579)
Cash dividends	(12,505)				(12,505)
Issuance of common stock for stock-based compensation awards (in shares)		124,433
Issuance of common stock for stock-based compensation awards	(2,465)		3,977	(6,442)
Stock-based compensation expense	3,338			3,338
Ending balance (in shares) at Mar. 31, 2022		55,880,666
Ending balance at Mar. 31, 2022	$ 2,137,642	$ 296,483	$ (114,050)	$ 1,297,088	$ 762,690	$ (104,569)