Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Preferred Stock	Common Stock	Warrant [Member]	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2011	$ 1,565,953	$ 0	$ 127,937	$ 0	$ 479,882	$ (23,887)	$ 1,131,203	$ (149,182)
Net income	60,929						60,929
Other Comprehensive Income (Loss), Net of Tax	5,462					5,462
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	66,391
Cash dividends - common stock	(34,710)						(34,710)
Nonvested (restricted) shares granted	0				(14,079)			14,079
Treasury Stock, Value, Acquired, Cost Method	(2,278)				966			(3,244)
Deferred compensation trust	0				(90)			90
Share-based compensation	5,410				5,410
Adjustments to Additional Paid in Capital, Other	49				49
Ending Balance at Jun. 30, 2012	1,600,815	0	127,937	0	472,138	(18,425)	1,157,422	(138,257)
Beginning Balance at Dec. 31, 2012	1,645,202	0	127,937	0	475,979	(16,205)	1,195,850	(138,359)
Net income	85,796						85,796
Other Comprehensive Income (Loss), Net of Tax	(55,691)					(55,692)
Other Comprehensive Loss, net of tax	(55,692)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	30,104
Dividends, Preferred Stock, Cash	(2,399)						(2,399)
Cash dividends - common stock	(43,717)						(43,717)
Consideration from common stock conversion (1.37 ratio)	925,272				925,272
Nonvested (restricted) shares granted	(6,813)				(19,094)			12,281
Treasury Stock, Value, Acquired, Cost Method	(2,506)				894			(3,400)
Deferred compensation trust	0				246			(246)
Share-based compensation	6,216				6,216			0
Issuance of preferred stock	96,550	100,000			(3,450)
Consideration from the warrant issued to the Treasury for Citizens' TARP warrant	3,000			3,000
Ending Balance at Jun. 30, 2013	$ 2,650,909	$ 100,000	$ 127,937	$ 3,000	$ 1,386,063	$ (71,897)	$ 1,235,530	$ (129,724)