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
Mar. 31, 2012
Mar. 31, 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 $ 4,275 $ 0
Available-for-sale Securities, Weighted Average Cumulative Losses 2.50%  
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 2.31  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate 37.50%  
Available-for-sale Securities, Weighted Average FICO Score 650  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance (5,102) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment (3,483) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (792) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance   $ 0