Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 424,609	$ 348,440
Interest-bearing bank deposits	439,342	267,236
Federal funds sold	1,346	1,604
Securities available for sale, at fair value (amortized cost of $1,304,997 and $1,408,780)	1,333,401	1,421,772
Securities held to maturity (fair value of $2,355,413 and $2,576,584)	2,343,828	2,611,352
Loans held for sale	22,017	24,515
Loans	12,884,056	12,324,817
Less: allowance for loan losses	(128,672)	(133,626)
Loans, net	12,755,384	12,191,191
Property and equipment, net of accumulated depreciation of $183,842 and $172,798	414,783	432,346
Prepaid expenses	65,331	65,220
Other real estate, net	59,537	76,668
Accrued interest receivable	44,259	42,977
Goodwill	621,193	625,675
Other intangible assets, net	145,825	159,773
Life insurance contracts	389,398	381,437
FDIC loss share receivable	90,255	113,834
Deferred tax asset, net	61,116	89,708
Other assets	137,807	155,503
Total assets	19,349,431	19,009,251
Deposits:
Noninterest-bearing demand	5,723,663	5,530,253
Interest-bearing transaction, savings, money market and time	9,521,564	9,830,263
Total deposits	15,245,227	15,360,516
Short-term borrowings	1,063,664	657,960
Long-term debt	374,991	385,826
Accrued interest payable	4,090	4,353
Other liabilities	168,877	175,527
Total liabilities	16,856,849	16,584,182
Stockholders' equity
Common stock-$3.33 par value per share; 350,000,000 shares authorized, 81,860,299 and 82,237,162 issued and outstanding, respectively	272,595	273,850
Capital surplus	1,566,336	1,558,432
Retained earnings	676,942	628,166
Accumulated other comprehensive loss, net	(23,291)	(35,379)
Total stockholders' equity	2,492,582	2,425,069
Total liabilities and stockholders' equity	$ 19,349,431	$ 19,009,251