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Securities Credit Impaired Debt Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investments debt and equity securities [Abstract]        
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 1,257 $ 3,040 $ 3,276 $ 2,938
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0 236 130 338
Other Than Temporary Impairment Credit Losses Recognized In Earnings, Reductions, Securities Sold 0 0 2,149 0
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 1,257 $ 3,276 $ 1,257 $ 3,276