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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 376,171 | $ 407,246
Derivatives asset, Fair Value | 9,825 | 4,530
Derivative liability, notional | 6,320,518 | 7,188,207
Derivative liability, Fair Value | 7,340 | 6,574
Commodity Contracts [Member] | U.S. Treasury Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 46,000 | 60,000
Derivative liability, Fair Value | 179 | 186
Commodity Contracts [Member] | Federal Funds Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 5,625,000 | 6,155,000
Derivative liability, Fair Value | 105 | 18
Commodity Contracts [Member] | Euro Dollars Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 299,000 | 347,000
Derivative liability, Fair Value | 105 | 44
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 108,067 | 115,569
Derivatives asset, Fair Value | 3,038 | 2,375
Derivative liability, notional | 74,300 | 76,604
Derivative liability, Fair Value | 4,402 | 3,653
Other Contracts [Member] | Tba [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 75,994 | 25,262
Derivatives asset, Fair Value | 441 | 134
Derivative liability, notional | 47,194 | 14,547
Derivative liability, Fair Value | 344 | 73
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 200,000 | 506,000
Other Contracts [Member] | Auction Rate Securities Commitments to Purchase [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 29,024 | 29,056
Derivative liability, Fair Value | 2,205 | 2,600
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 192,110 | 266,415
Derivatives asset, Fair Value | $ 6,346 | $ 2,021

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