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Regulatory Matters (Details Textuals) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Regulatory Capital Requirements [Abstract]
Required minimum cash and reserve balances	$ 56

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

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