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Premises and Equipment (Details Textuals) (USD $)	12 Months Ended
Premises and Equipment (Details Textuals) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property Plant And Equipment Textuals [Abstract]
Depreciation and amortization	$ 24	$ 22	$ 22
Rental expense under leases	$ 15	$ 13	$ 13

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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