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Investments (Narrative) (Details) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2011 investments reportablesegment interestrateswaps | Dec. 31, 2010 | Sep. 30, 2010
Schedule of Investments [Line Items] |  |  |
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months | $ 2,122,000 |  |
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months | 76,000 |  |
Number of investments in continuous unrealized loss position for more than twelve months | 19 |  |
Unrealized Losses Related To Marketability Of Securities Or Issuers Ability To Honor Redemption Obligations | 0 |  |
Investment value deemed to be OTTI | 0 |  |
Investment securities, aggregate carrying value, pledged as collateral | $ 2,563,412,000 | $ 2,096,850,000 | $ 2,015,500,000

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