Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks	$ 303,874	$ 356,455
Interest-bearing bank deposits	564,671	801,576
Federal funds sold	884	1,372
Securities available for sale, at fair value (amortized cost of $2,086,745 and $1,631,761)	2,093,404	1,660,165
Securities held to maturity (fair value of $2,375,851 and $2,186,340)	2,370,388	2,166,289
Loans held for sale	20,434	20,252
Loans	15,703,314	13,895,276
Less: allowance for loan losses	(181,179)	(128,762)
Loans, net	15,522,135	13,766,514
Property and equipment, net of accumulated depreciation of $209,763 and $193,527	377,015	398,384
Prepaid expense	17,560	28,277
Other real estate, net	26,256	58,415
Accrued interest receivable	54,068	47,501
Goodwill	621,193	621,193
Other intangible assets, net	107,538	132,810
Life insurance contracts	434,550	426,617
FDIC loss share receivable	29,868	60,272
Deferred tax asset, net	75,830	74,335
Other assets	219,791	126,839
Total assets	22,839,459	20,747,266
Deposits:
Noninterest-bearing	7,276,127	5,945,208
Interest-bearing	11,072,785	10,627,623
Total deposits	18,348,912	16,572,831
Short-term borrowings	1,423,644	1,151,573
Long-term debt	495,999	374,371
Accrued interest payable	6,609	4,204
Other liabilities	151,152	171,885
Total liabilities	20,426,316	18,274,864
Stockholders' equity:
Common stock-$3.33 par value per share; 350,000,000 shares authorized, 77,496,429 and 80,426,485 outstanding	258,063	267,820
Capital surplus	1,684,101	1,689,291
Treasury shares at cost-9,319,082 and 7,053,028 shares	(226,370)	(158,131)
Retained earnings	777,944	723,496
Accumulated other comprehensive loss, net	(80,595)	(50,074)
Total stockholders' equity	2,413,143	2,472,402
Total liabilities and stockholders' equity	$ 22,839,459	$ 20,747,266