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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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 $ (1,426) $ (4,476) $ (1,662) $ (8,751)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities     4 27
Available-for-sale Securities, Weighted Average Cumulative Losses 10.90%   10.90%  
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 0.067   0.067  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate     35.60%  
Available-for-sale Securities, Weighted Average FICO Score 626   626  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance (15,142) (9,377) (15,561) (5,102)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 0 (2,644) 0 (6,128)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (1,426) (1,832) (1,662) (2,623)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows 231 250 231 250
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 1,291 0 1,946 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ (15,046) $ (13,603) $ (15,046) $ (13,603)