Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and due from banks	$ 244,223	$ 219,256
Interest-bearing deposits in banks	13,791	158,063
Total cash and cash equivalents	258,014	377,319
Investment securities
Held-to-maturity	622,121	82,764
Available-for-sale	2,920,971	3,353,553
Other investments	140,717	140,726
Loans held for sale	23,683	30,077
Noncovered loans:
Commercial loans	5,866,489	5,107,747
Mortgage loans	445,211	413,664
Installment loans	1,328,258	1,263,665
Home equity loans	806,078	743,982
Credit card loans	146,387	146,356
Loans and Leases Receivable, Gross, Consumer, Lease Financing	139,236	73,530
Total noncovered loans	8,731,659	7,748,944
Allowance for noncovered loan losses	(98,942)	(107,699)
Net non-covered loans	8,632,717	7,641,245
Covered loans (includes loss share receivable of $113.7 million and $205.7 million at December 31, 2012 and 2011, respectively)	1,019,125	1,497,140
Covered Certain Loans Acquired in Transfer not Accounted for as Debt Securities Allowance for Loan Losses	(43,255)	(36,417)
Covered Loans and Leases Receivable Gross Carrying Amount	975,870	1,460,723
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	9,608,587	9,101,968
Premises and equipment, net	181,149	192,949
Goodwill	460,044	460,044
Intangible assets	6,373	8,239
Covered other real estate (includes loss share receivable of $.05 million and $1.3 million at December 31, 2012 and December 31, 2011, respectively)	59,855	54,505
Accrued interest receivable and other assets	631,498	639,558
Total assets	14,913,012	14,441,702
Deposits:
Demand-non-interest bearing	3,338,371	3,030,225
Demand-interest bearing	1,287,674	1,062,896
Savings and money market accounts	5,758,123	5,595,409
Certificates and other time deposits	1,375,257	1,743,079
Total deposits	11,759,425	11,431,609
Federal funds purchased and securities sold under agreements to repurchase	1,104,525	866,265
Wholesale borrowings	136,883	203,462
Accrued taxes, expenses and other liabilities	266,977	374,413
Total liabilities	13,267,810	12,875,749
Shareholders' equity:
Preferred stock, without par value	0	0
Common stock, without par value; authorized 300,000,000 shares; issued: 2012 and 2011 - 115,121,731 shares	127,937	127,937
Capital surplus	475,979	479,882
Accumulated other comprehensive loss	(16,205)	(23,887)
Retained earnings	1,195,850	1,131,203
Treasury stock, at cost: 2012- 5,472,915; 2011 - 5,870,923 shares	(138,359)	(149,182)
Total shareholders' equity	1,645,202	1,565,953
Total liabilities and shareholders' equity	14,913,012	14,441,702
Series A Preferred Stock [Member]
Shareholders' equity:
Preferred stock, without par value	0	0
Series B Convertible Preferred Stock [Member]
Shareholders' equity:
Preferred stock, without par value	$ 0	$ 0