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Investment Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Schedule of Investments [Line Items] |
Residential mortgage-backed securities and collateralized mortgage obligations, term | 15 years
U.S. Treasury And Sponsored Entities Callable Notes [Member] |
Schedule of Investments [Line Items] |
Available-for-sale securities | 599.1
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. treasury and sponsored entities callable notes | 9 years
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member] |
Schedule of Investments [Line Items] |
Maturity period of U.S. treasury and sponsored entities callable notes | 15 years

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