Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2020	$ 1,374,507		$ 580	$ 591,360	$ 7,822	$ 1,811,979	$ (1,037,234)
Beginning Balance (in shares) at Dec. 31, 2020			40,119,312
Net Income	59,949					59,949
Other Comprehensive Income (Loss)	(49,609)				(49,609)
Share-Based Compensation	2,780			2,780
Common Stock Issued under Purchase and Equity Compensation Plans	2,809			664		(845)	2,990
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			310,905
Common Stock Repurchased	(3,189)						(3,189)
Common Stock Repurchased (in shares)			(35,983)
Cash Dividends Declared Common Stock (per share)	(27,026)					(27,026)
Balance at Mar. 31, 2021	1,360,221		$ 580	594,804	(41,787)	1,844,057	(1,037,433)
Ending Balance (in shares) at Mar. 31, 2021			40,394,234
Balance at Dec. 31, 2020	1,374,507		$ 580	591,360	7,822	1,811,979	(1,037,234)
Beginning Balance (in shares) at Dec. 31, 2020			40,119,312
Net Income	189,535
Other Comprehensive Income (Loss)	(56,390)				(56,390)
Balance at Sep. 30, 2021	1,597,109	$ 180,000	$ 580	598,341	(48,568)	1,916,861	(1,050,105)
Ending Balance (in shares) at Sep. 30, 2021		180,000	40,305,801
Balance at Mar. 31, 2021	1,360,221		$ 580	594,804	(41,787)	1,844,057	(1,037,433)
Beginning Balance (in shares) at Mar. 31, 2021			40,394,234
Net Income	67,533					67,533
Other Comprehensive Income (Loss)	319				319
Share-Based Compensation	3,342			3,342
Preferred Stock Issued, Net	175,487	$ 180,000		(4,513)
Preferred Stock Issued, Net (in shares)		180,000
Common Stock Issued under Purchase and Equity Compensation Plans	3,851		$ 0	628		(46)	3,269
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			72,421
Common Stock Repurchased	(109)						(109)
Common Stock Repurchased (in shares)			(1,173)
Cash Dividends Declared Common Stock (per share)	(27,113)					(27,113)
Balance at Jun. 30, 2021	1,583,531	$ 180,000	$ 580	594,261	(41,468)	1,884,431	(1,034,273)
Ending Balance (in shares) at Jun. 30, 2021		180,000	40,465,482
Net Income	62,053					62,053
Other Comprehensive Income (Loss)	(7,100)				(7,100)
Share-Based Compensation	3,536			3,536
Common Stock Issued under Purchase and Equity Compensation Plans	4,499			544		(327)	4,282
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			82,939
Common Stock Repurchased	(20,114)						(20,114)
Common Stock Repurchased (in shares)			(242,620)
Cash Dividends Declared Common Stock (per share)	(28,290)					(28,290)
Cash Dividends Declared Preferred Stock	(1,006)					(1,006)
Balance at Sep. 30, 2021	1,597,109	$ 180,000	$ 580	598,341	(48,568)	1,916,861	(1,050,105)
Ending Balance (in shares) at Sep. 30, 2021		180,000	40,305,801
Balance at Dec. 31, 2021	1,611,611	$ 180,000	$ 581	602,508	(66,382)	1,950,375	(1,055,471)
Beginning Balance (in shares) at Dec. 31, 2021		180,000	40,253,193
Net Income	54,834					54,834
Other Comprehensive Income (Loss)	(179,771)				(179,771)
Share-Based Compensation	4,010			4,010
Common Stock Issued under Purchase and Equity Compensation Plans	2,395		$ 1	543		(185)	2,036
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			197,783
Common Stock Repurchased	(13,960)						(13,960)
Common Stock Repurchased (in shares)			(162,611)
Cash Dividends Declared Common Stock (per share)	(28,265)					(28,265)
Cash Dividends Declared Preferred Stock	(1,969)					(1,969)
Balance at Mar. 31, 2022	1,448,885	$ 180,000	$ 582	607,061	(246,153)	1,974,790	(1,067,395)
Ending Balance (in shares) at Mar. 31, 2022		180,000	40,288,365
Balance at Dec. 31, 2021	1,611,611	$ 180,000	$ 581	602,508	(66,382)	1,950,375	(1,055,471)
Beginning Balance (in shares) at Dec. 31, 2021		180,000	40,253,193
Net Income	164,497
Other Comprehensive Income (Loss)	(381,312)				(381,312)
Balance at Sep. 30, 2022	1,282,384	$ 180,000	$ 582	615,985	(447,694)	2,024,641	(1,091,130)
Ending Balance (in shares) at Sep. 30, 2022		180,000	40,011,473
Balance at Mar. 31, 2022	1,448,885	$ 180,000	$ 582	607,061	(246,153)	1,974,790	(1,067,395)
Beginning Balance (in shares) at Mar. 31, 2022		180,000	40,288,365
Net Income	56,862					56,862
Other Comprehensive Income (Loss)	(122,295)				(122,295)
Share-Based Compensation	4,162			4,162
Common Stock Issued under Purchase and Equity Compensation Plans	1,663			471		531	661
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			30,442
Common Stock Repurchased	(10,353)						(10,353)
Common Stock Repurchased (in shares)			(136,148)
Cash Dividends Declared Common Stock (per share)	(28,209)					(28,209)
Cash Dividends Declared Preferred Stock	(1,969)					(1,969)
Balance at Jun. 30, 2022	1,348,746	$ 180,000	$ 582	611,694	(368,448)	2,002,005	(1,077,087)
Ending Balance (in shares) at Jun. 30, 2022		180,000	40,182,659
Net Income	52,801					52,801
Other Comprehensive Income (Loss)	(79,246)				(79,246)
Share-Based Compensation	3,775			3,775
Common Stock Issued under Purchase and Equity Compensation Plans	1,617			516		(91)	1,192
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)			19,741
Common Stock Repurchased	(15,235)						(15,235)
Common Stock Repurchased (in shares)			(190,927)
Cash Dividends Declared Common Stock (per share)	(28,105)					(28,105)
Cash Dividends Declared Preferred Stock	(1,969)					(1,969)
Balance at Sep. 30, 2022	$ 1,282,384	$ 180,000	$ 582	$ 615,985	$ (447,694)	$ 2,024,641	$ (1,091,130)
Ending Balance (in shares) at Sep. 30, 2022		180,000	40,011,473