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Restrictions on Cash and Due From Banks (Details) (USD $)
In Billions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Restrictions on Cash and Due From Banks (Textual) [Abstract]    
Minimum average reserve balances to be maintain at bank subsidiaries $ 1.7 $ 1.2
Balances held at the federal reserve $ 8.5 $ 10.1