Quarterly report pursuant to Section 13 or 15(d)

Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details)

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Other than Temporary Impairment, Credit Losses Recognized in Earnings (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
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ (559) $ (3,371) $ (9,310) $ (3,665)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities     37 8
Available-for-sale Securities, Weighted Average Cumulative Losses 1.70%   1.70%  
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 3.04   3.04  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate     36.60%  
Available-for-sale Securities, Weighted Average FICO Score 650   650  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance (13,603) (294) (5,102) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment (315) (3,371) (6,443) (3,665)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (244) 0 (2,867) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows 0 0 250 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 243 0 243 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ (13,919) $ (3,665) $ (13,919) $ (3,665)