Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Loans	$ 10,083,266	$ 9,430,761
Allowance for loan losses	(84,666)	(81,143)
Net loans	9,998,600	9,349,618
Loans held for sale	10,495	589
Investment securities:
Available for sale	6,771,179	6,806,949
Held to maturity (fair value of $991,715 and $691,379, respectively)	880,600	667,106
Trading securities	56,311	29,617
Other securities	66,300	65,198
Total investment securities	7,774,390	7,568,870
Federal funds sold and securities purchased under agreements to resell	196,283	173,627
Interest-bearing due from banks	379,611	522,877
Cash and due from banks	355,732	458,217
Premises and equipment, net	277,060	281,471
Accrued income	92,650	90,127
Goodwill	228,396	228,346
Other intangibles, net	40,411	46,782
Other assets	380,448	373,721
Total assets	19,734,076	19,094,245
Deposits:
Noninterest-bearing demand	6,233,492	6,306,895
Interest-bearing demand and savings	8,270,416	7,529,972
Time deposits under $250,000	695,629	771,973
Time deposits of $250,000 or more	449,156	483,912
Total deposits	15,648,693	15,092,752
Federal funds purchased and repurchase agreements	1,788,567	1,818,062
Short-term debt	5,003	5,009
Long-term debt	85,320	86,070
Accrued expenses and taxes	149,027	161,245
Other liabilities	54,734	37,413
Total liabilities	17,731,344	17,200,551
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized; 55,056,730 shares issued; and 49,528,986 and 49,396,366 shares outstanding, respectively	55,057	55,057
Capital surplus	1,023,195	1,019,889
Retained earnings	1,083,280	1,033,990
Accumulated other comprehensive income (loss), net	55,295	(3,718)
Treasury stock, 5,527,744 and 5,660,364 shares, at cost, respectively	(214,095)	(211,524)
Total shareholders' equity	2,002,732	1,893,694
Total liabilities and shareholders' equity	$ 19,734,076	$ 19,094,245