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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Detail) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional $ 407,246 $ 449,065
Derivatives asset, Fair Value 4,530 3,188
Derivative liability, notional 7,188,207 6,296,916
Derivative liability, Fair Value 6,574 3,232
Commodity Contracts [Member] | U.S. Treasury Futures [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 60,000 56,000
Derivative liability, Fair Value 186 286
Commodity Contracts [Member] | Federal Funds Futures [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 6,155,000 6,070,000
Derivative liability, Fair Value 18 120
Commodity Contracts [Member] | Euro Dollars Futures [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 347,000 15,000
Derivative liability, Fair Value 44 4
Other Contracts [Member] | Interest Rate Lock Commitments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional 115,569  
Derivatives asset, Fair Value 2,375  
Derivative liability, notional 76,604  
Derivative liability, Fair Value 3,653  
Other Contracts [Member] | Tba [Member]
   
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional 25,262 121,823
Derivatives asset, Fair Value 134 160
Derivative liability, notional 14,547 117,573
Derivative liability, Fair Value 73 175
Other Contracts [Member] | Forward Start Repurchase Agreement [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 506,000  
Derivative liability, Fair Value     
Other Contracts [Member] | ARS Purchase Commitments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 29,056 38,343
Derivative liability, Fair Value 2,600 2,647
Other Contracts [Member] | Tba Sale Agreements [Member]
   
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional 266,415 327,242
Derivatives asset, Fair Value $ 2,021 $ 3,028