Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 372,689	$ 303,874
Interest-bearing bank deposits	77,235	564,671
Federal funds sold	942	884
Securities available for sale, at fair value (amortized cost of $2,562,000 and $2,086,745)	2,516,908	2,093,404
Securities held to maturity (fair value of $2,470,117 and $2,375,851)	2,500,220	2,370,388
Loans held for sale	34,064	20,434
Loans	16,752,151	15,703,314
Less: allowance for loan losses	(229,418)	(181,179)
Loans, net	16,522,733	15,522,135
Property and equipment, net of accumulated depreciation of $231,127 and $209,763	361,612	377,015
Prepaid expenses	18,038	17,560
Other real estate, net	18,884	26,256
Accrued interest receivable	65,887	54,068
Goodwill	621,193	621,193
Other intangible assets, net	87,757	107,538
Life insurance contracts	480,406	434,550
FDIC loss share receivable	16,219	29,868
Deferred tax asset, net	104,435	75,830
Other assets	176,080	213,937
Total assets	23,975,302	22,833,605
Deposits:
Noninterest-bearing	7,658,203	7,276,127
Interest-bearing	11,766,063	11,072,785
Total deposits	19,424,266	18,348,912
Short-term borrowings	1,225,406	1,423,644
Long-term debt	436,280	490,145
Accrued interest payable	9,574	6,609
Other liabilities	160,008	151,152
Total liabilities	21,255,534	20,420,462
Stockholders' equity:
Common Stock	291,358	291,346
Capital surplus	1,698,253	1,424,448
Retained earnings	850,689	777,944
Accumulated other comprehensive loss, net	(120,532)	(80,595)
Total stockholders' equity	2,719,768	2,413,143
Total liabilities and stockholders' equity	$ 23,975,302	$ 22,833,605
Common shares authorized (par value of 3.33 per share)	350,000	350,000
Common shares issued	87,495	87,491
Common shares outstanding	84,235	77,496