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Composition of federal funds purchased and assets sold under agreements to repurchase (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets Sold under Agreements to Repurchase [Line Items]
Federal Funds Purchased	$ 100,000	$ 0
Assets sold under agreements to repurchase	2,108,213	1,659,292
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	$ 2,208,213	$ 1,659,292

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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