Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Preferred Stock	Common Stock	Warrant	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2010	$ 1,507,715	$ 0	$ 127,937	$ 0	$ 485,567	$ (26,103)	$ 1,080,900	$ (160,586)
Net income	119,558	0	0	0	0	0	119,558	0
Other Comprehensive Income (Loss), Net of Tax	2,216	0	0	0	0	2,216	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	121,774	0	0	0	0	2,216	119,558	0
Cash dividends - common stock	(69,255)	0	0	0	0	0	(69,255)	0
Nonvested (restricted) shares granted	0	0	0	0	(14,222)	0	0	14,222
Treasury Stock, Value, Acquired, Cost Method	2,295	0	0	0	602	0	0	2,897
Deferred compensation trust	0	0	0	0	(79)	0	0	79
Recognition of stock compensation expense	8,014	0	0	0	8,014	0	0
Ending Balance at Dec. 31, 2011	1,565,953	0	127,937	0	479,882	(23,887)	1,131,203	(149,182)
Net income	134,106	0	0	0	0	0	134,106	0
Other Comprehensive Income (Loss), Net of Tax	7,682	0	0	0	0	7,682	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	141,788	0	0	0	0	7,682	134,106	0
Cash dividends - common stock	(69,459)	0	0	0	0	0	(69,459)	0
Nonvested (restricted) shares granted	49	0	0	0	(14,582)	0	0	14,631
Treasury Stock, Value, Acquired, Cost Method	2,389	0	0	0	1,219	0	0	3,608
Deferred compensation trust	0	0	0	0	200	0	0	(200)
Recognition of stock compensation expense	9,260	0	0	0	9,260	0	0	0
Ending Balance at Dec. 31, 2012	1,645,202	0	127,937	0	475,979	(16,205)	1,195,850	(138,359)
Net income	183,684	0	0	0	0	0		0
Other Comprehensive Income (Loss), Net of Tax	(50,671)	0	0	0	0	(50,671)	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	133,013	0	0	0	0	(50,671)	183,684	0
Dividends, Preferred Stock, Cash	(5,337)	0	0	0	0	0	(5,337)	0
Cash dividends - common stock	(96,222)	0	0	0	0	0	(96,222)	0
Stock Issued During Period, Value, Acquisitions	925,272	0	0	0	925,272	0	0	0
Nonvested (restricted) shares granted	(6,813)	0	0	0	(19,790)	0	0	12,977
Treasury Stock, Value, Acquired, Cost Method	2,708	0	0	0	1,261	0	0	3,969
Deferred compensation trust	0	0	0	0	434	0	0	(434)
Recognition of stock compensation expense	10,937	0	0	0	10,937	0	0	0
Issuance of common stock	96,550	100,000	0	0	(3,450)	0	0	0
Adjustments to Additional Paid in Capital, Warrant Issued	3,000	0	0	3,000	0	0	0	0
Ending Balance at Dec. 31, 2013	$ 2,702,894	$ 100,000	$ 127,937	$ 3,000	$ 1,390,643	$ (66,876)	$ 1,277,975	$ (129,785)