Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 415,024	$ 348,440
Interest-bearing bank deposits	279,322	267,236
Federal funds sold	1,051	1,604
Securities available for sale, at fair value (amortized cost of $1,353,442 and $1,408,780)	1,370,948	1,421,772
Securities held to maturity (fair value of $2,417,879 and $2,576,584)	2,426,935	2,611,352
Loans held for sale	15,911	24,515
Loans	12,527,937	12,324,817
Less: allowance for loan losses	(128,248)	(133,626)
Loans, net	12,399,689	12,191,191
Property and equipment, net of accumulated depreciation of $178,271 and $172,798	425,638	432,346
Prepaid expenses	65,799	65,220
Other real estate, net	69,606	76,668
Accrued interest receivable	41,722	42,977
Goodwill	625,675	625,675
Other intangible assets, net	152,734	159,773
Life insurance contracts	387,564	381,437
FDIC loss share receivable	104,469	113,834
Deferred tax asset, net	74,682	89,708
Other assets	147,401	155,503
Total assets	19,004,170	19,009,251
Deposits:
Noninterest-bearing demand	5,613,872	5,530,253
Interest-bearing savings, NOW, money market and time	9,660,902	9,830,263
Total deposits	15,274,774	15,360,516
Short-term borrowings	712,634	657,960
Long-term debt	380,001	385,826
Accrued interest payable	5,914	4,353
Other liabilities	168,313	175,527
Total liabilities	16,541,636	16,584,182
Stockholders' equity
Common stock - $3.33 par value per share; 350,000,000 shares authorized, 82,282,057 and 82,237,162 issued and outstanding, respectively	273,999	273,850
Capital surplus	1,563,462	1,558,432
Retained earnings	657,062	628,166
Accumulated other comprehensive loss, net	(31,989)	(35,379)
Total stockholders' equity	2,462,534	2,425,069
Total liabilities and stockholders' equity	$ 19,004,170	$ 19,009,251