Composition of Loans Held-In-Portfolio (Detail) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	$ 25,274,269	[1]	$ 25,564,917	[2]
Non-covered loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	20,657,694	[1]	20,728,035	[2]
Non-covered loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	6,840,778		7,006,676
Non-covered loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	3,895,555		4,386,809
Non-covered loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	393,759		500,851
Non-covered loans | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	5,347,512		4,524,722
Non-covered loans | Leasing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	586,056		602,993
Non-covered loans | Consumer | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,114,147		1,132,308
Non-covered loans | Consumer | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	595,027		568,353
Non-covered loans | Consumer | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,137,983		1,236,067
Non-covered loans | Consumer | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	507,839		503,757
Non-covered loans | Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	239,038		265,499
Covered loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	4,616,575	[1]	4,836,882	[2]
Covered loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	2,337,389		2,463,549
Covered loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	258,376		303,632
Covered loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	645,160		640,492
Covered loans | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,238,228		1,259,459
Covered loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	137,422		169,750
Covered loans | Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	137,422		169,750
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	9,178,167		9,470,225
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	4,153,931		4,690,441
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,038,919		1,141,343
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	6,585,740		5,784,181
Leasing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	586,056		602,993
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	3,731,456
Consumer | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,114,147		1,132,308
Consumer | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	595,027		568,353
Consumer | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	1,137,983		1,236,067
Consumer | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	507,839		503,757
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-in-portfolio	$ 376,460		$ 435,249

[1] Loans held-in-portfolio at June 30, 2011 are net of $ 104 million in unearned income and exclude $ 509 million in loans held-for-sale.

[2] Loans held-in-portfolio at December 31, 2010 are net of $106 million in unearned income and exclude $894 million in loans held-for-sale.