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Repurchase Agreements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Person	Dec. 31, 2011 Person
Repurchase Agreement Counterparty [Line Items]
Number of counterparties in repurchase agreements	24	23
Weighted average contractual maturity of the repurchase agreements outstanding (in months)	24 days	24 days
Repurchase agreement amount	$ 22,866,429	$ 16,162,375
Weighted Average Contractual Rate	0.47%	0.37%
Fair value of assets pledged as collateral under repurchase agreements	$ 24,268,949	$ 17,061,970

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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