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Loans and leases and the allowance for credit losses - Outstanding Principal Balance and Carrying Amount of Loans that is Included in Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Outstanding principal balance $ 7,338,476 $ 9,203,366
Carrying Amount 6,383,467 8,159,787
Commercial, financial, leasing, etc [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Carrying Amount 977,430 1,331,198
Real Estate Commercial [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Carrying Amount 2,962,899 3,879,518
Residential real estate [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Carrying Amount 742,977 915,371
Consumer [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Carrying Amount $ 1,700,161 $ 2,033,700