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Investment Securities Schedule of Carrying Value of Pledged Securities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying value of investment securites pledged as collateral to secure public deposits, repurchase sweep agreements, and for other purposes	$ 29.1	$ 54.4

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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