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Securities Sold Under Agreements to Repurchase (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Securities Financing Transaction [Line Items]
Balance at Ending of Year	$ 699.8	$ 1,198.8
Average Balance During the Year	448.2	815.8
Average Interest Rate Paid During the Year	0.08%	0.08%
Maximum Month-End Balance During the Year	$ 699.8	$ 1,479.3

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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