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Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Securities [Abstract]
Securities pledged as collateral against borrowings and public deposits, fair value	$ 6.5	$ 20.2

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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