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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

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