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Borrowings (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reverse repurchase agreements
Total	$ 1,100,000	$ 1,700,000
Reverse repurchase agreements
Reverse repurchase agreements
2015	200,000
2017	900,000
Total	$ 1,100,000	$ 1,700,000	$ 2,100,000

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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