Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
ASSETS
Cash and due from banks	$ 472,848	$ 480,998	$ 523,027
Interest-bearing deposits in banks	114,741	216,426	119,543
Total cash and cash equivalents	587,589	697,424	642,570
Investment securities:
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,787,513	2,903,609	3,052,118
Available-for-sale	3,838,509	3,545,288	3,478,420
Other investments	147,967	148,654	148,433
Loans Receivable Held-for-sale, Carrying Amount	5,432	13,428	21,632
Loans	15,705,110	15,326,147	14,969,627
Allowance for loan losses	(148,259)	(143,649)	(142,036)
Net loans	15,556,851	15,182,498	14,827,591
Premises and equipment, net	313,819	332,297	315,770
Goodwill	741,740	741,740	741,740
Intangible assets	65,824	71,020	76,886
Covered other real estate	1,065	49,641	51,072
Accrued interest receivable and other assets	1,250,705	1,216,748	1,208,199
Total assets	25,297,014	24,902,347	24,564,431
Deposits:
Noninterest-bearing	5,725,850	5,786,662	5,525,484
Interest-bearing	3,304,969	3,028,888	3,028,479
Savings and money market accounts	8,418,716	8,399,612	8,476,096
Certificates and other time deposits	2,224,315	2,289,503	2,268,337
Total deposits	19,673,850	19,504,665	19,298,396
Federal funds purchased and securities sold under agreements to repurchase	1,519,250	1,272,591	1,218,855
Wholesale borrowings	366,074	428,071	649,021
Long-term debt	497,393	505,192	324,433
Accrued taxes, expenses and other liabilities	352,490	357,547	281,988
Total liabilities	22,409,057	22,068,066	21,772,693
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: June 30, 2015, December 31, 2014 and June 30, 2014 - 170,183,540 shares	127,937	127,937	127,937
Capital surplus	1,379,194	1,393,090	1,387,253
Accumulated other comprehensive loss	(67,621)	(71,892)	(39,507)
Retained earnings	1,462,859	1,404,717	1,335,371
Treasury stock, at cost: June 30, 2015 - 4,410,939; December 31, 2014 - 4,793,566 shares; June 30, 2014 - 4,790,517 shares	(114,412)	(122,571)	(122,316)
Total shareholders' equity	2,887,957	2,834,281	2,791,738
Total liabilities and shareholders' equity	$ 25,297,014	$ 24,902,347	$ 24,564,431