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Note 3 - Investment Securities (Detail) (USD $)	3 Months Ended
Note 3 - Investment Securities (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Available-for-sale Securities Pledged as Collateral	$ 438.6		$ 434.8
Securities Sold under Agreements to Repurchase	60.2		58.8
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 0	$ 0

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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