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Financial instruments with off-Balance Sheet credit risk, whose contract amounts represent potential credit risk (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Commitments To Extend Credit Member | Credit Card [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset $ 4,562,258 $ 4,594,676
Commitments To Extend Credit Member | Commercial Line Of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset 2,166,706 2,569,377
Commitments To Extend Credit Member | Other Loan Commitments [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset 304,394 326,874
Commercial Letters Of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset 2,351 3,059
Standby Letters of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset 44,945 78,948
Mortgage Loan Commitments [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Offbalance Sheet Risks Face Amount Asset $ 37,418 $ 47,722