Annual report pursuant to Section 13 and 15(d)

Available-for-Sale Securities, at Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details)

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Available-for-Sale Securities, at Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 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 $ 0 $ 0 $ (1,426) $ (236) $ (1,642) $ (559) $ (4,476) $ (4,275) $ (1,662) $ (10,952) $ (5,102)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities                 4 33 13
Available-for-sale Securities, Weighted Average Cumulative Losses 9.90%               9.90%    
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 0.046               0.046    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate                 33.20%    
Available-for-sale Securities, Weighted Average FICO Score 668               668    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance       (15,561)       (5,102) (15,561) (5,102) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment                 0 (9,537) (5,102)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses                 (1,662) (1,415) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows                 1,677 250 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold                 6,079 243 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ (9,467)       $ (15,561)       $ (9,467) $ (15,561) $ (5,102)