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Repurchase Agreements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Number of counterparties in repurchase agreements	23	20
Weighted average contractual maturity of the repurchase agreements outstanding (in months)	0.8	0.9
Balance, repurchase agreement	$ 14,800,594	$ 8,681,060
Weighted Average Contractual Rate	0.24%	0.44%
Within 30 Days [Member]
Balance, repurchase agreement	14,800,594	7,530,317
Weighted Average Contractual Rate	0.24%	0.38%
30 Days to 3 Months [Member]
Balance, repurchase agreement		1,050,743
Weighted Average Contractual Rate		0.60%
3 Months to 36 Months [Member]
Balance, repurchase agreement		$ 100,000
Weighted Average Contractual Rate		2.96%

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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