Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Loans	$ 12,549,732	$ 12,178,150
Allowance for loan losses	(103,661)	(103,635)
Net loans	12,446,071	12,074,515
Loans held for sale	1,267	3,192
Securities:
Available for sale	6,891,869	6,542,800
Held to maturity (fair value of $1,122,660 and $1,070,532, respectively)	1,147,947	1,170,646
Trading securities	56,025	61,011
Other securities	75,357	73,692
Total investment securities	8,171,198	7,848,149
Federal funds sold and securities purchased under agreements to resell	264,772	627,001
Interest-bearing due from banks	1,113,470	1,047,830
Cash and due from banks	399,387	645,123
Premises and equipment, net	279,000	283,879
Accrued income	117,007	110,168
Goodwill	180,867	180,867
Other intangibles, net	13,676	15,003
Other assets	570,045	515,392
Total assets	23,556,760	23,351,119
Deposits:
Noninterest-bearing demand	6,448,422	6,680,070
Interest-bearing demand and savings	12,018,580	11,454,442
Time deposits under $250,000	591,405	593,904
Time deposits of $250,000 or more	306,808	552,844
Total deposits	19,365,215	19,281,260
Federal funds purchased and repurchase agreements	1,494,048	1,518,920
Long-term debt	81,608	82,671
Accrued expenses and taxes	142,483	177,731
Other liabilities	122,563	62,067
Total liabilities	21,205,917	21,122,649
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized; 55,056,730 shares issued; and 49,058,246 and 49,117,222 shares outstanding, respectively	55,057	55,057
Capital surplus	1,060,630	1,054,601
Retained earnings	1,531,396	1,488,421
Accumulated other comprehensive loss, net	(17,639)	(95,782)
Treasury stock, 5,998,484 and 5,939,508 shares, at cost, respectively	(278,601)	(273,827)
Total shareholders' equity	2,350,843	2,228,470
Total liabilities and shareholders' equity	$ 23,556,760	$ 23,351,119