Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance $ 0 $ 0 $ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment (5,102) 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ (5,102) $ 0 $ 0
Available-for-sale Securities, Weighted Average Cumulative Losses 5.50%    
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 1.99    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate 37.90%    
Available-for-sale Securities, Weighted Average FICO Score 653