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)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale [Abstract]      
Other-than-temporary impairment losses $ (14,300) $ (500) $ (800)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities | position 18 3  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Market Value $ 319,200    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Cumulative Losses 3.50%    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 0.053    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Delinquency Rate 16.30%    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average FICO Score 636    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Cumulative credit loss at beginning of period $ (6,865) $ (6,395) (5,606)
Other-than-temporary impairments not previously recognized (11,724) (264) (429)
Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments (2,588) (206) (360)
Decreases related to other-than-temporary impairments on securities paid down 1,703 0 0
Decreases related to other-than-temporary impairments on securities sold 2,453 0 0
Cumulative credit loss at end of period $ (17,021) $ (6,865) $ (6,395)