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Investment Securities (Narrative) (Details) (USD $) | 6 Months Ended |  | 3 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 U.S. Treasury And Sponsored Entities Callable Notes [Member] | Jun. 30, 2011 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Mar. 31, 2011 U.S. Government Sponsored Entities Asset-Backed Securities [Member] | Jun. 30, 2012 U.S. Government Sponsored Entities Asset-Backed Securities [Member] Minimum [Member] | Jun. 30, 2012 U.S. Government Sponsored Entities Asset-Backed Securities [Member] Maximum [Member] | Jun. 30, 2011 Obligations Of States And Political Subdivisions [Member]
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 54,000 | $ 0 |  |  |  |  |  |
Available-for-sale securities |  |  | 490,000,000 |  |  |  |  |
Residential mortgage-backed securities and collateralized mortgage obligations, term |  |  |  |  |  | 9 years | 15 years |
Proceeds from Sale of Available-for-sale Securities, Debt |  |  |  | 191,000,000 | 105,400,000 |  |  | 1,000,000
Pre-tax gain on sale of securities |  |  |  | $ 15,400,000 | $ 6,600,000 |  |  |

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