Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Loans	$ 11,631,628	$ 11,280,513
Allowance for loan losses	(98,298)	(100,604)
Net loans	11,533,330	11,179,909
Loans held for sale	3,482	1,460
Securities:
Available for sale	6,011,684	6,258,577
Held to maturity (fair value of $1,103,937 and $1,207,447, respectively)	1,204,582	1,261,014
Trading securities	67,091	54,055
Other securities	66,547	65,897
Total investment securities	7,349,904	7,639,543
Federal funds sold and securities purchased under agreements to resell	70,346	191,601
Interest-bearing due from banks	113,875	1,351,760
Cash and due from banks	379,433	392,723
Premises and equipment, net	274,408	275,942
Accrued income	100,133	98,863
Goodwill	180,867	180,867
Other intangibles, net	17,210	20,257
Other assets	508,482	438,658
Total assets	20,531,470	21,771,583
Deposits:
Noninterest-bearing demand	5,994,426	6,839,171
Interest-bearing demand and savings	9,471,698	9,903,565
Time deposits under $250,000	512,446	547,990
Time deposits of $250,000 or more	407,508	732,274
Total deposits	16,386,078	18,023,000
Federal funds purchased and repurchase agreements	1,666,158	1,260,704
Long-term debt	78,692	79,281
Accrued expenses and taxes	147,608	191,464
Other liabilities	51,122	35,603
Total liabilities	18,329,658	19,590,052
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized; 55,056,730 shares issued; and 50,086,844 and 49,894,990 shares outstanding, respectively	55,057	55,057
Capital surplus	1,050,660	1,046,095
Retained earnings	1,434,342	1,338,110
Accumulated other comprehensive loss, net	(128,959)	(45,525)
Treasury stock, 4,969,886 and 5,161,740 shares, at cost, respectively	(209,288)	(212,206)
Total shareholders' equity	2,201,812	2,181,531
Total liabilities and shareholders' equity	$ 20,531,470	$ 21,771,583