Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 301,475	$ 448,491
Interest-bearing bank deposits	474,444	1,498,985
Federal funds sold	1,233	1,203
Securities available for sale, at fair value (amortized cost of $2,804,411 and $1,986,882)	2,853,539	2,048,442
Securities held to maturity (fair value of $1,848,886 and $1,710,465)	1,808,740	1,668,018
Loans held for sale	34,813	50,605
Loans	11,499,559	11,595,512
Less: allowance for loan losses	(137,777)	(136,171)
unearned income	(16,797)	(17,710)
Loans, net	11,344,985	11,441,631
Property and equipment, net of accumulated depreciation of $158,423 and $160,592	476,353	477,864
Prepaid expenses	54,269	55,359
Other real estate, net	79,018	101,442
Accrued interest receivable	46,390	45,616
Goodwill	625,675	628,877
Other intangible assets, net	181,853	189,409
Life insurance contracts	371,927	367,317
FDIC loss share receivable	152,731	177,844
Deferred tax asset, net	131,185	128,385
Other assets	125,493	134,997
Total assets	19,064,123	19,464,485
Deposits:
Non-interest bearing demand	5,418,463	5,624,127
Interest-bearing savings, NOW, money market and time	9,834,888	10,120,061
Total deposits	15,253,351	15,744,188
Short-term borrowings	722,537	639,133
Long-term debt	393,920	396,589
Accrued interest payable	6,374	4,814
Other liabilities	210,841	226,483
Total liabilities	16,587,023	17,011,207
Stockholders' equity
Common stock-$3.33 par value per share; 350,000,000 shares authorized, 84,881,970 and 84,847,796 issued and outstanding, respectively	282,657	282,543
Capital surplus	1,652,109	1,647,638
Retained earnings	573,812	546,022
Accumulated other comprehensive income (loss), net	(31,478)	(22,925)
Total stockholders' equity	2,477,100	2,453,278
Total liabilities and stockholders' equity	$ 19,064,123	$ 19,464,485