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Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Held-to-Maturity      
Carrying Value $ 88,699 $ 76,363  
Held-to-Maturity      
Held-to-Maturity      
Face Value 111,028 103,515  
Carrying Value 88,699 76,363  
Unrealized Gain 3,039 2,734  
Estimated Fair Value 91,738 79,097  
Impairment charges 0    
Interest income (including the amortization of discount) $ 9,900 $ 5,800 $ 1,800
Held-to-Maturity | Seven B Piece Bonds      
Held-to-Maturity      
Bonds retained percentage 49.00%    
Discounted value of bonds purchased $ 74,700    
Remaining of B Piece bond sold to the third party at par 51.00%    
Estimated weighted average remaining maturity period 5 years 9 months 18 days    
Initial face value of bonds purchased $ 106,200    
Held-to-Maturity | Agency B Piece Bonds      
Held-to-Maturity      
Weighted average variable interest rate (as a percent) 3.74%    
Weighted average effective interest rate (as a percent) 10.85% 10.94%  
Held-to-maturity securities, estimated fiscal year      
Within one year $ 14,200    
After one year through five years 40,800    
After five years through ten years 20,600    
After ten years 15,400    
Held-to-Maturity | SFR bonds      
Held-to-Maturity      
Initial face value of bonds purchased $ 20,000    
Securities maturity term 6 months    
Weighted average fixed interest rate 4.58%    
Held-to-maturity securities, estimated fiscal year      
Within one year $ 18,700    
After one year through five years $ 1,300