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Securities Held-to-Maturity Rollforward of Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss $ 992   $ 0  
Provision for credit loss expense 2,156   2,647  
Allowance for credit loss, ending balance 3,148   3,148  
Impairment of held-to maturity securities     0  
Accrued interest, held-to-maturity securities 600   600  
Held-to-Maturity        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Investment Income, Interest 1,700 $ 2,300 4,000 $ 4,400
APL certificates        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Provision for credit loss expense 2,079   2,079  
Allowance for credit loss, ending balance 2,079   2,079  
B Piece bonds        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss 992      
Provision for credit loss expense 77   568  
Allowance for credit loss, ending balance 1,069   1,069  
Impact of adopting CECL | Impact of Adoption        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss, ending balance 501   501  
Impact of adopting CECL | Impact of Adoption | B Piece bonds        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss, ending balance $ 501   $ 501