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)

v3.19.1
Available-for-Sale Securities, at Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
position
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
position
Debt Securities, Available-for-sale [Abstract]                      
Other-than-temporary impairment losses $ (107) $ (95) $ (174) $ (94) $ (360) $ 0 $ (429) $ 0 $ (470) $ (789) $ (1,822)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities | position         2       3   4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Market Value $ 135,500               $ 135,500    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Cumulative Losses 8.80%                    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 0.058                    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Delinquency Rate 18.60%                    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average FICO Score 667                    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]                      
Cumulative credit loss at beginning of period       $ (6,395)       $ (5,606) (6,395) (5,606) $ (6,499)
Other-than-temporary impairments not previously recognized                 (264) (429) (1,307)
Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments                 (206) (360) (515)
Decreases related to other-than-temporary impairments on securities paid down                 0 0 1,387
Decreases related to other-than-temporary impairments on securities sold                 0 0 1,328
Cumulative credit loss at end of period $ (6,865)       $ (6,395)       $ (6,865) $ (6,395) $ (5,606)