Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Series E Preferred Stock	Series F Preferred Stock	Cumulative Effect, Period Of Adoption, Adjustment	Preferred Equity	Preferred Equity Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common Stock Cumulative Effect, Period Of Adoption, Adjustment	Surplus	Surplus Cumulative Effect, Period Of Adoption, Adjustment	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Other Comprehensive (Loss)	Accumulated Other Comprehensive (Loss) Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock, Common	Treasury Stock, Common Performance/Service Based RSAs, RSA,	Treasury Stock, Common Cumulative Effect, Period Of Adoption, Adjustment
Beginning balance at Dec. 31, 2021	$ 4,024,853			$ 4,026,566	$ 193,195	$ 193,195	$ 1,752	$ 1,752	$ 1,713,851	$ 1,713,851	$ 2,672,601	$ 2,674,314	$ (10,317)	$ (10,317)	$ (546,229)		$ (546,229)
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2021				$ 1,713								$ 1,713
Comprehensive income:
Net income	74,262										74,262
Net other comprehensive income during period	(126,708)												(126,708)
Comprehensive income (loss)	(52,445)
Common stock issued:
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	6,654								(11,911)		0				18,565
Purchase of treasury stock,	(5,193)															$ (5,193)
Cash dividends:
Common stock	(30,583)										(30,583)
Preferred stock(a)	(2,875)										(2,875)
Stock-based compensation expense, net	6,164								6,164
Ending balance at Mar. 31, 2022	3,948,287				193,195		1,752		1,708,104		2,715,118		(137,024)		(532,858)
Cash dividends:
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.3671875	$ 0.3515625
Beginning balance at Dec. 31, 2022	4,015,490				194,112		1,752		1,712,733		2,904,882		(272,799)		(525,190)
Comprehensive income:
Net income	103,360										103,360
Net other comprehensive income during period	39,211												39,211
Comprehensive income (loss)	142,571
Common stock issued:
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	1,766								(12,612)						14,379
Purchase of treasury stock,	(5,362)															$ (5,362)
Cash dividends:
Common stock	(32,013)										(32,013)
Preferred stock(a)	(2,875)										(2,875)
Stock-based compensation expense, net	6,086								6,086
Ending balance at Mar. 31, 2023	$ 4,125,663				$ 194,112		$ 1,752		$ 1,706,206		$ 2,973,354		$ (233,588)		$ (516,173)
Cash dividends:
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.3671875	$ 0.3515625