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Cash and Cash Equivalents (Details) (Vault cash [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Vault cash [Member]
Cash and Cash Equivalents (Textual) [Abstract]
Non interest bearing reserve balances	$ 13.8	$ 11.6

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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