Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 329,608	$ 356,455
Interest-bearing bank deposits	592,131	801,576
Federal funds sold	6,324	1,372
Securities available for sale, at fair value (amortized cost of $2,136,856 and $1,631,761)	2,151,134	1,660,165
Securities held to maturity (fair value of $2,310,103 and $2,186,340)	2,294,318	2,166,289
Loans held for sale	21,304	20,252
Loans	14,344,752	13,895,276
Less: allowance for loan losses	(131,087)	(128,762)
Loans, net	14,213,665	13,766,514
Property and equipment, net of accumulated depreciation of $198,595 and $193,527	383,686	398,384
Prepaid expenses	34,375	28,277
Other real estate, net	37,371	58,415
Accrued interest receivable	50,527	47,501
Goodwill	621,193	621,193
Other intangible assets, net	119,256	132,810
Life insurance contracts	431,895	426,617
FDIC loss share receivable	35,074	60,272
Deferred tax asset, net	78,203	74,335
Other assets	138,341	126,839
Total assets	21,538,405	20,747,266
Deposits:
Noninterest-bearing	6,180,814	5,945,208
Interest-bearing	11,120,974	10,627,623
Total deposits	17,301,788	16,572,831
Short-term borrowings	1,079,193	1,151,573
Long-term debt	507,341	374,371
Accrued interest payable	5,534	4,204
Other liabilities	214,509	171,885
Total liabilities	19,108,365	18,274,864
Stockholders' equity
Common stock - $3.33 par value per share; 350,000,000 shares authorized, 78,093,729 and 80,426,485 shares outstanding	260,052	267,820
Capital surplus	1,705,531	1,689,291
Treasury shares at cost - 8,721,782 and 7,053,028	(235,239)	(158,131)
Retained earnings	759,780	723,496
Accumulated other comprehensive loss, net	(60,084)	(50,074)
Total stockholders' equity	2,430,040	2,472,402
Total liabilities and stockholders' equity	$ 21,538,405	$ 20,747,266