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Borrowings (Other Short-Term Borrowings) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Borrowings [Abstract]
Securities sold under repurchase agreements	$ 294,845	$ 306,423
Federal funds purchased	250,000	458,000
Treasury tax and loan notes	6,400	6,200
Total other short-term borrowings	$ 551,245	$ 770,623

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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