Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Available-for-Sale Securities, at Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
position
Jun. 30, 2016
USD ($)
position
Available-for-sale Securities [Abstract]        
Other-than-temporary impairment losses $ (429) $ (90) $ (429) $ (807)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities | position     1 3
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Market Value $ 117,553   $ 117,553  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Cumulative Losses 5.20%      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 0.052      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Delinquency Rate 21.40%      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average FICO Score 659      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Cumulative credit loss at beginning of period $ (5,606) (6,620) (5,606) $ (6,499)
Other-than-temporary impairments not previously recognized (429) 0 (429) (292)
Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments 0 (90) 0 (515)
Decreases related to other-than-temporary impairments on securities paid down 0 0 0 0
Decreases related to other-than-temporary impairments on securities sold 0 0 0 596
Cumulative credit loss at end of period $ (6,035) $ (6,710) $ (6,035) $ (6,710)