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Details of Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, amount	$ 3,425,000	$ 4,125,000
Contractual Maturity Over 90 days, Weighted Average Interest Rate	3.44%
Mortgage-Related Securities
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, Amortized Cost	2,791,591
Contractual Maturity Over 90 days, Fair Value	2,798,199
U.S. Treasury and GSE Obligations
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, Amortized Cost	1,366,895
Contractual Maturity Over 90 days, Fair Value	$ 1,270,525

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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