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Investment Securities (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investment Securities [Abstract]
Security Owned and Pledged as Collateral, Fair Value	$ 168.2	$ 175.1

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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