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Investment Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2011
Schedule of Investments [Line Items] |
Residential mortgage-backed securities and collateralized mortgage obligations, term (years) | 15
U.S. Treasury And Sponsored Entities Callable Notes [Member] |
Schedule of Investments [Line Items] |
Available-for-sale securities | $ 193
U.S. Treasury And Sponsored Entities Discount Notes [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. treasury and sponsored entities callable notes | 30 D
Available-for-sale securities | $ 30
Minimum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. treasury and sponsored entities callable notes | 7Y
Maximum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. treasury and sponsored entities callable notes | 11Y

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