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Investment Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2011 years
Schedule of Investments [Line Items] |
Residential mortgage-backed securities and collateralized mortgage obligations, term (years) | 15
Minimum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. Treasury and sponsored entities callable notes | 7
Maximum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. Treasury and sponsored entities callable notes | 11
U.S. Treasury And Sponsored Entities Callable Notes [Member] |
Schedule of Investments [Line Items] |
Available-for-sale securities | 278
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 | 2
Available-for-sale securities | 30

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