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 loss 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, 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	161,086										161,086
Net other comprehensive loss during period	(172,472)												(172,472)
Comprehensive income (loss)	(11,386)
Ending balance at Jun. 30, 2022	3,959,382				193,195		1,752		1,710,319		2,768,736		(182,788)		(531,832)
Beginning balance at Mar. 31, 2022	3,948,287				193,195		1,752		1,708,104		2,715,118		(137,024)		(532,858)
Comprehensive income:
Net income	86,824										86,824
Net other comprehensive loss during period	(45,764)												(45,764)
Comprehensive income (loss)	41,060
Common stock issued:
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	139								(1,771)		0				1,910
Purchase of treasury stock,	(884)															(884)
Cash dividends:
Common stock	(30,331)										(30,331)
Preferred stock(a)	(2,875)										(2,875)
Stock-based compensation expense, net	3,986								3,986
Ending balance at Jun. 30, 2022	3,959,382				193,195		1,752		1,710,319		2,768,736		(182,788)		(531,832)
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 loss 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
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	190,514										190,514
Net other comprehensive loss during period	(18,843)												(18,843)
Comprehensive income (loss)	171,671
Ending balance at Jun. 30, 2023	4,122,874				194,112		1,752		1,708,303		3,025,637		(291,642)		(515,287)
Beginning balance at Mar. 31, 2023	4,125,663				194,112		1,752		1,706,206		2,973,354		(233,588)		(516,173)
Comprehensive income:
Net income	87,154										87,154
Net other comprehensive loss during period	(58,054)												(58,054)
Comprehensive income (loss)	29,100
Common stock issued:
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	93								(1,677)						1,770
Purchase of treasury stock,	(884)															$ (884)
Cash dividends:
Common stock	(31,996)										(31,996)
Preferred stock(a)	(2,875)										(2,875)
Stock-based compensation expense, net	3,773								3,773
Ending balance at Jun. 30, 2023	$ 4,122,874				$ 194,112		$ 1,752		$ 1,708,303		$ 3,025,637		$ (291,642)		$ (515,287)
Cash dividends:
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.3671875	$ 0.3515625