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, 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, 2019	4,384,188				209,691	$ 141,423	3,622,208	443,559				(32,214)	(479)
Beginning balance (in shares) at Dec. 31, 2019						403,278
Net income	87,268							87,268
Other comprehensive income, net of tax	25,648											25,648
Cash dividends declared:
Cash dividends declared on preferred stock		$ (1,797)	$ (1,375)						$ (1,797)	$ (1,375)
Cash dividends declared on common stock				$ (44,979)							$ (44,979)
Effect of stock incentive plan, net (in shares)						466
Effect of stock incentive plan, net	232					$ 190	1,828	(2,065)					279
Ending balance at Mar. 31, 2020	$ 4,420,998				$ 209,691	$ 141,613	$ 3,624,036	$ 452,424				$ (6,566)	$ (200)
Ending balance (in shares) at Mar. 31, 2020						403,744