CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - 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, Adjusted	$ 2,515,554				$ 209,691	$ 92,727	$ 2,060,356	$ 199,663				$ (46,546)	$ (337)
Beginning balance at Dec. 31, 2017	2,533,165				209,691	$ 92,727	2,060,356	216,733				(46,005)	(337)
Beginning balance (in shares) at Dec. 31, 2017						264,469
Net income	41,965							41,965
Other comprehensive income, net of tax	(17,557)											(17,557)
Cash dividends declared:
Cash dividends declared on preferred stock		$ (1,797)	$ (1,375)						$ (1,797)	$ (1,375)
Cash dividends declared on common stock				$ (36,635)							$ (36,635)
Effect of stock incentive plan, net (in shares)						1,714
Effect of stock incentive plan, net	6,637					$ 355	8,717	(2,266)					(169)
Common stock issued (in shares)						65,007
Common stock issued	738,211					$ 22,742	715,121						348
Ending balance at Mar. 31, 2018	3,245,003				209,691	$ 115,824	2,784,194	199,555				(64,103)	(158)
Ending balance (in shares) at Mar. 31, 2018						331,190
Beginning balance at Dec. 31, 2017	2,533,165				209,691	$ 92,727	2,060,356	216,733				(46,005)	(337)
Beginning balance (in shares) at Dec. 31, 2017						264,469
Net income	114,767
Ending balance at Jun. 30, 2018	3,277,312				209,691	$ 116,027	2,789,190	232,593				(69,124)	(1,065)
Ending balance (in shares) at Jun. 30, 2018						331,454
Beginning balance at Mar. 31, 2018	3,245,003				209,691	$ 115,824	2,784,194	199,555				(64,103)	(158)
Beginning balance (in shares) at Mar. 31, 2018						331,190
Net income	72,802							72,802
Other comprehensive income, net of tax	(5,021)											(5,021)
Cash dividends declared:
Cash dividends declared on preferred stock		(1,797)	(1,375)						(1,797)	(1,375)
Cash dividends declared on common stock				(36,534)							(36,534)
Effect of stock incentive plan, net (in shares)						264
Effect of stock incentive plan, net	4,234					$ 203	4,996	(58)					(907)
Ending balance at Jun. 30, 2018	3,277,312				209,691	$ 116,027	2,789,190	232,593				(69,124)	(1,065)
Ending balance (in shares) at Jun. 30, 2018						331,454
Beginning Balance, Adjusted	3,353,422				209,691	$ 116,240	2,796,499	302,610				(69,431)	(2,187)
Beginning balance at Dec. 31, 2018	3,350,454				209,691	$ 116,240	2,796,499	299,642				(69,431)	(2,187)
Beginning balance (in shares) at Dec. 31, 2018						331,431
Net income	113,330							113,330
Other comprehensive income, net of tax	16,174											16,174
Cash dividends declared:
Cash dividends declared on preferred stock		(1,797)	(1,375)						(1,797)	(1,375)
Cash dividends declared on common stock				(36,686)							(36,686)
Effect of stock incentive plan, net (in shares)						302
Effect of stock incentive plan, net	1,811					$ 226	2,935	(99)					(1,251)
Ending balance at Mar. 31, 2019	3,444,879				209,691	$ 116,466	2,799,434	375,983				(53,257)	(3,438)
Ending balance (in shares) at Mar. 31, 2019						331,733
Beginning balance at Dec. 31, 2018	3,350,454				209,691	$ 116,240	2,796,499	299,642				(69,431)	(2,187)
Beginning balance (in shares) at Dec. 31, 2018						331,431
Net income	189,798
Ending balance at Jun. 30, 2019	3,504,118				209,691	$ 116,571	2,804,059	412,190				(35,131)	(3,262)
Ending balance (in shares) at Jun. 30, 2019						331,788
Beginning balance at Mar. 31, 2019	3,444,879				209,691	$ 116,466	2,799,434	375,983				(53,257)	(3,438)
Beginning balance (in shares) at Mar. 31, 2019						331,733
Net income	76,468							76,468
Other comprehensive income, net of tax	18,126											18,126
Cash dividends declared:
Cash dividends declared on preferred stock		$ (1,797)	$ (1,375)						$ (1,797)	$ (1,375)
Cash dividends declared on common stock				$ (36,712)							$ (36,712)
Effect of stock incentive plan, net (in shares)						55
Effect of stock incentive plan, net	4,529					$ 105	4,625	(377)					176
Ending balance at Jun. 30, 2019	$ 3,504,118				$ 209,691	$ 116,571	$ 2,804,059	$ 412,190				$ (35,131)	$ (3,262)
Ending balance (in shares) at Jun. 30, 2019						331,788