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Details of Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, amount	$ 4,125,000	$ 4,125,000
Contractual Maturity Over 90 days, Weighted Average Interest Rate	3.54%
Mortgage-Related Securities
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, Amortized Cost	3,251,187
Contractual Maturity Over 90 days, Fair Value	3,398,156
U.S. Treasury and GSE Obligations
Debt Outstanding [Line Items]
Contractual Maturity Over 90 days, Amortized Cost	930,826
Contractual Maturity Over 90 days, Fair Value	$ 946,670

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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