Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Loans	$ 11,964,724	$ 11,280,513
Allowance for loan losses	(101,302)	(100,604)
Net loans	11,863,422	11,179,909
Loans held for sale	2,222	1,460
Securities:
Available for sale	5,932,741	6,258,577
Held to maturity (fair value of $1,091,640 and $1,207,447, respectively)	1,199,114	1,261,014
Trading securities	81,159	54,055
Other securities	65,252	65,897
Total investment securities	7,278,266	7,639,543
Federal funds sold and securities purchased under agreements to resell	206,412	191,601
Interest-bearing due from banks	668,990	1,351,760
Cash and due from banks	348,700	392,723
Premises and equipment, net	277,123	275,942
Accrued income	104,012	98,863
Goodwill	180,867	180,867
Other intangibles, net	16,335	20,257
Other assets	516,011	438,658
Total assets	21,462,360	21,771,583
Deposits:
Noninterest-bearing demand	5,757,353	6,839,171
Interest-bearing demand and savings	10,938,839	9,903,565
Time deposits under $250,000	594,705	547,990
Time deposits of $250,000 or more	445,807	732,274
Total deposits	17,736,704	18,023,000
Federal funds purchased and repurchase agreements	1,192,985	1,260,704
Long-term debt	78,523	79,281
Accrued expenses and taxes	171,548	191,464
Other liabilities	79,136	35,603
Total liabilities	19,258,896	19,590,052
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized; 55,056,730 shares issued; and 49,847,139 and 49,894,990 shares outstanding, respectively	55,057	55,057
Capital surplus	1,054,801	1,046,095
Retained earnings	1,477,732	1,338,110
Accumulated other comprehensive loss, net	(155,641)	(45,525)
Treasury stock, 5,209,591 and 5,161,740 shares, at cost, respectively	(228,485)	(212,206)
Total shareholders' equity	2,203,464	2,181,531
Total liabilities and shareholders' equity	$ 21,462,360	$ 21,771,583