Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 291,099	$ 303,874
Interest-bearing bank deposits	151,193	564,671
Federal funds sold	358	884
Securities available for sale, at fair value (amortized cost of $2,116,271 and $2,086,745)	2,149,466	2,093,404
Securities held to maturity (fair value of $2,566,799 and $2,375,851)	2,518,371	2,370,388
Loans held for sale	24,001	20,434
Loans	15,978,124	15,703,314
Less: allowance for loan losses	(217,794)	(181,179)
Loans, net	15,760,330	15,522,135
Property and equipment, net of accumulated depreciation of $216,418 and $209,763	371,319	377,015
Prepaid expenses	20,152	17,560
Other real estate, net	23,191	26,256
Accrued interest receivable	57,448	54,068
Goodwill	621,193	621,193
Other intangible assets, net	102,414	107,538
Life insurance contracts	435,494	434,550
FDIC loss share receivable	25,828	29,868
Deferred tax asset, net	72,131	75,830
Other assets	185,382	213,937
Total assets	22,809,370	22,833,605
Deposits:
Noninterest-bearing	7,108,598	7,276,127
Interest-bearing	11,547,552	11,072,785
Total deposits	18,656,150	18,348,912
Short-term borrowings	1,100,787	1,423,644
Long-term debt	471,245	490,145
Accrued interest payable	8,455	6,609
Other liabilities	151,693	151,152
Total liabilities	20,388,330	20,420,462
Stockholders' equity
Common Stock - $3.33 par value per share; 350,000,000 shares authorized, 77,507,960 and 77,496,429 outstanding	258,102	258,063
Capital surplus	1,688,482	1,684,101
Treasury shares at cost - 9,307,551 and 9,319,082 shares	(227,130)	(226,370)
Retained earnings	762,652	777,944
Accumulated other comprehensive loss, net	(61,066)	(80,595)
Total stockholders' equity	2,421,040	2,413,143
Total liabilities and stockholders' equity	$ 22,809,370	$ 22,833,605