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Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value $ 534,640 $ 603,019
Liability derivatives, Fair value 301,146 384,866
Derivatives Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 165,655 144,293
Liability derivatives, Fair value 387 3,825
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 368,985 458,726
Liability derivatives, Fair value 300,759 381,041
Interest Rate Swap Agreements [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 114,168 143,179
Liability derivatives, Fair value      
Commitments to Sell Real Estate Loans [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 51,487 1,114
Liability derivatives, Fair value 387 3,825
Commitments to Sell Real Estate Loans [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 39,193 1,982
Liability derivatives, Fair value 14,154 6,570
Mortgage-Related Commitments to Originate Real Estate Loans for Sale [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 16,109 48,056
Liability derivatives, Fair value 8,701 197
Interest Rate Contracts [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 302,979 399,963
Liability derivatives, Fair value 267,463 365,616
Foreign Exchange and Other Option and Futures Contracts [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives, Fair value 10,704 8,725
Liability derivatives, Fair value $ 10,441 $ 8,658