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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
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

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details