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Note 8 - Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Repurchase Agreements, Number of Counterparties	27	26
Securities Sold under Agreements to Repurchase (in Dollars)	$ 1,108,942	$ 1,135,830
Outstanding Borrowings [Member]
Repurchase Agreements, Number of Counterparties	18	18

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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