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, 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	138,838
Other comprehensive loss	(14,374)
Comprehensive (loss) income	124,464
Ending balance (in shares) at Sep. 30, 2021		55,747,407
Ending balance at Sep. 30, 2021	2,203,944	$ 296,483	(118,288)	1,298,022	717,033	10,694
Beginning balance (in shares) at Mar. 31, 2021		56,294,346
Beginning balance at Mar. 31, 2021	2,173,701	$ 296,483	(98,949)	1,294,911	661,117	20,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,867				40,867
Other comprehensive loss	(889)					(889)
Comprehensive (loss) income	39,978
Cash dividends	(12,540)				(12,540)
Issuance of common stock for stock-based compensation awards (in shares)		56,532
Issuance of common stock for stock-based compensation awards	283		1,700	(1,417)
Stock-based compensation expense	2,385			2,385
Ending balance (in shares) at Jun. 30, 2021		56,350,878
Ending balance at Jun. 30, 2021	2,203,807	$ 296,483	(97,249)	1,295,879	689,444	19,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,063				40,063
Other comprehensive loss	(8,556)					(8,556)
Comprehensive (loss) income	31,507
Cash dividends	(12,474)				(12,474)
Repurchase of shares in connection with stock repurchase program (in shares)		(612,107)
Repurchase of shares in connection with stock repurchase program	(21,314)		(21,314)
Issuance of common stock for stock-based compensation awards (in shares)		8,636
Issuance of common stock for stock-based compensation awards	(176)		275	(451)
Stock-based compensation expense	2,594			2,594
Ending balance (in shares) at Sep. 30, 2021		55,747,407
Ending balance at Sep. 30, 2021	2,203,944	$ 296,483	(118,288)	1,298,022	717,033	10,694
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)
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	119,792
Other comprehensive loss	(205,609)
Comprehensive (loss) income	(85,817)
Ending balance (in shares) at Sep. 30, 2022		55,953,104
Ending balance at Sep. 30, 2022	2,092,281	$ 296,483	(111,577)	1,299,476	823,951	(216,052)
Beginning balance (in shares) at Mar. 31, 2022		55,880,666
Beginning balance at Mar. 31, 2022	2,137,642	$ 296,483	(114,050)	1,297,088	762,690	(104,569)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39,678				39,678
Other comprehensive loss	(50,829)					(50,829)
Comprehensive (loss) income	(11,151)
Cash dividends	(12,488)				(12,488)
Issuance of common stock for stock-based compensation awards (in shares)		51,351
Issuance of common stock for stock-based compensation awards	(78)		1,755	(1,833)
Stock-based compensation expense	2,952			2,952
Ending balance (in shares) at Jun. 30, 2022		55,932,017
Ending balance at Jun. 30, 2022	2,116,877	$ 296,483	(112,295)	1,298,207	789,880	(155,398)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	46,567				46,567
Other comprehensive loss	(60,654)					(60,654)
Comprehensive (loss) income	(14,087)
Cash dividends	(12,496)				(12,496)
Issuance of common stock for stock-based compensation awards (in shares)		21,087
Issuance of common stock for stock-based compensation awards	(282)		718	(1,000)
Stock-based compensation expense	2,269			2,269
Ending balance (in shares) at Sep. 30, 2022		55,953,104
Ending balance at Sep. 30, 2022	$ 2,092,281	$ 296,483	$ (111,577)	$ 1,299,476	$ 823,951	$ (216,052)