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 Beginning of Period 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 End of Period 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 Beginning of Period 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 End of Period 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