Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
ASSETS
Cash and due from banks	$ 357,397	$ 480,998	$ 429,699
Interest-bearing deposits in banks	54,190	216,426	55,629
Total cash and cash equivalents	411,587	697,424	485,328
Investment securities:
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,728,638	2,903,609	3,002,262
Available-for-sale	3,925,724	3,545,288	3,462,990
Other investments	147,955	148,654	148,421
Loans Receivable Held-for-sale, Carrying Amount	5,384	13,428	19,512
Loans	15,799,280	15,326,147	15,242,026
Allowance for loan losses	(153,450)	(143,649)	(140,077)
Net loans	15,645,830	15,182,498	15,101,949
Premises and equipment, net	311,129	332,297	318,690
Goodwill	741,740	741,740	741,740
Intangible assets	63,226	71,020	73,953
Covered other real estate	1,986	49,641	51,434
Accrued interest receivable and other assets	1,263,718	1,216,748	1,201,928
Total assets	25,246,917	24,902,347	24,608,207
Deposits:
Noninterest-bearing	5,865,255	5,786,662	5,535,886
Interest-bearing	3,335,190	3,028,888	3,043,952
Savings and money market accounts	8,380,921	8,399,612	8,396,064
Certificates and other time deposits	2,240,550	2,289,503	2,391,009
Total deposits	19,821,916	19,504,665	19,366,911
Federal funds purchased and securities sold under agreements to repurchase	1,208,275	1,272,591	1,273,290
Wholesale borrowings	381,299	428,071	608,463
Long-term debt	508,947	505,192	249,933
Accrued taxes, expenses and other liabilities	389,180	357,547	289,179
Total liabilities	22,309,617	22,068,066	21,787,776
Shareholders' equity:
Preferred Stock, Value, Issued	100,000	100,000	100,000
Common Stock warrant	0	3,000	3,000
Common Stock, without par value; authorized 300,000,000 shares; issued: September 30, 2015, December 31, 2014 and September 30, 2014 - 170,183,515 shares	127,937	127,937	127,937
Capital surplus	1,382,714	1,393,090	1,390,207
Accumulated other comprehensive loss	(50,766)	(71,892)	(49,583)
Retained earnings	1,492,245	1,404,717	1,371,453
Treasury stock, at cost: September 30, 2015 - 4,424,712; December 31, 2014 - 4,793,566 shares; September 30, 2014 - 4,799,239 shares	(114,830)	(122,571)	(122,583)
Total shareholders' equity	2,937,300	2,834,281	2,820,431
Total liabilities and shareholders' equity	$ 25,246,917	$ 24,902,347	$ 24,608,207