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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	$ 439,949	$ 407,246
Derivatives asset, Fair Value	7,285	4,530
Derivative liability, notional	4,874,151	7,188,207
Derivative liability, Fair Value	4,542	6,574
Commodity Contracts [Member] \| U.S. Treasury Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	72,000	60,000
Derivative liability, Fair Value	87	186
Commodity Contracts [Member] \| Federal Funds Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	3,950,000	6,155,000
Derivative liability, Fair Value	135	18
Commodity Contracts [Member] \| general collateral futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	225,000
Derivative liability, Fair Value	2
Commodity Contracts [Member] \| Euro Dollars Futures [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	300,000	347,000
Derivative liability, Fair Value	60	44
Other Contracts [Member] \| Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	139,947	115,569
Derivatives asset, Fair Value	5,511	2,375
Derivative liability, notional	51,106	76,604
Derivative liability, Fair Value	3,188	3,653
Other Contracts [Member] \| Forward Start Repurchase Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	181,000
Other Contracts [Member] \| Tba [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	86,631	25,262
Derivatives asset, Fair Value	63	134
Derivative liability, notional	81,973	14,547
Derivative liability, Fair Value	33	73
Other Contracts [Member] \| Tba Sale Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	213,371	266,415
Derivatives asset, Fair Value	1,711	2,021
Other Contracts [Member] \| Forward Start Repurchase Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional		506,000
Other Contracts [Member] \| Auction Rate Securities Purchase Commitment [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	13,072	29,056
Derivative liability, Fair Value	$ 1,037	$ 2,600

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.

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