CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Series A	Preferred Series B	Common Stock	Preferred Stock	Common Stock	Surplus	Retained Earnings	Retained Earnings Preferred Series A	Retained Earnings Preferred Series B	Retained Earnings Common Stock	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2020	$ 4,592,120				$ 209,691	$ 141,746	$ 3,637,468	$ 611,158				$ (7,718)	$ (225)
Beginning balance (in shares) at Dec. 31, 2020						403,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	115,710							115,710
Other comprehensive income (loss), net of tax	(9,287)											(9,287)
Cash dividends declared:
Cash dividends declared on preferred stock		$ (1,797)	$ (1,375)						$ (1,797)	$ (1,375)
Cash dividends declared on common stock				$ (45,281)							$ (45,281)
Effect of stock incentive plan, net (in shares)						1,939
Effect of stock incentive plan, net	9,580					$ 689	14,480	(5,764)					175
Ending balance at Mar. 31, 2021	4,659,670				209,691	$ 142,435	3,651,948	672,651				(17,005)	(50)
Ending balance (in shares) at Mar. 31, 2021						405,798
Beginning balance at Dec. 31, 2020	4,592,120				209,691	$ 141,746	3,637,468	611,158				(7,718)	(225)
Beginning balance (in shares) at Dec. 31, 2020						403,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	236,222
Ending balance at Jun. 30, 2021	4,737,807				209,691	$ 142,550	3,658,636	744,768				(17,735)	(103)
Ending balance (in shares) at Jun. 30, 2021						406,084
Beginning balance at Mar. 31, 2021	4,659,670				209,691	$ 142,435	3,651,948	672,651				(17,005)	(50)
Beginning balance (in shares) at Mar. 31, 2021						405,798
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	120,512							120,512
Other comprehensive income (loss), net of tax	(730)											(730)
Cash dividends declared:
Cash dividends declared on preferred stock		(1,797)	(1,375)						(1,797)	(1,375)
Cash dividends declared on common stock				(45,093)							(45,093)
Effect of stock incentive plan, net (in shares)						286
Effect of stock incentive plan, net	6,620					$ 115	6,688	(130)					(53)
Ending balance at Jun. 30, 2021	4,737,807				209,691	$ 142,550	3,658,636	744,768				(17,735)	(103)
Ending balance (in shares) at Jun. 30, 2021						406,084
Beginning balance at Dec. 31, 2021	5,084,066				209,691	$ 148,482	3,883,035	883,645				(17,932)	(22,855)
Beginning balance (in shares) at Dec. 31, 2021						421,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116,728							116,728
Other comprehensive income (loss), net of tax	(38,166)											(38,166)
Cash dividends declared:
Cash dividends declared on preferred stock		(1,797)	(1,375)						(1,797)	(1,375)
Cash dividends declared on common stock				(46,803)							(46,803)
Effect of stock incentive plan, net (in shares)						972
Effect of stock incentive plan, net	(2,752)						(10,799)	(5,173)					13,220
Purchase of treasury stock (in shares)						(1,015)
Purchase of treasury stock	(13,517)												(13,517)
Ending balance at Mar. 31, 2022	5,096,384				209,691	$ 148,482	3,872,236	945,225				(56,098)	(23,152)
Ending balance (in shares) at Mar. 31, 2022						421,394
Beginning balance at Dec. 31, 2021	5,084,066				209,691	$ 148,482	3,883,035	883,645				(17,932)	(22,855)
Beginning balance (in shares) at Dec. 31, 2021						421,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	213,141
Ending balance at Jun. 30, 2022	6,204,913				209,691	$ 178,185	4,965,488	982,146				(108,337)	(22,260)
Ending balance (in shares) at Jun. 30, 2022						506,329
Beginning balance at Mar. 31, 2022	5,096,384				209,691	$ 148,482	3,872,236	945,225				(56,098)	(23,152)
Beginning balance (in shares) at Mar. 31, 2022						421,394
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	96,413							96,413
Other comprehensive income (loss), net of tax	(52,239)											(52,239)
Cash dividends declared:
Cash dividends declared on preferred stock		$ (1,797)	$ (1,375)						$ (1,797)	$ (1,375)
Cash dividends declared on common stock				$ (56,211)							$ (56,211)
Effect of stock incentive plan, net (in shares)						72
Effect of stock incentive plan, net	5,909					$ 1	5,125	(109)					892
Stock issued during period, shares, acquisitions (in shares)						84,863
Stock issued during period, value, acquisitions	1,117,829					$ 29,702	1,088,127
Ending balance at Jun. 30, 2022	$ 6,204,913				$ 209,691	$ 178,185	$ 4,965,488	$ 982,146				$ (108,337)	$ (22,260)
Ending balance (in shares) at Jun. 30, 2022						506,329