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Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Held-to-Maturity    
Face Value $ 210,728 $ 140,124
Net Carrying Value 140,484 95,524
Unrealized Gain 9,427  
Unrealized Loss   (1,396)
Estimated Fair Value 149,911 94,128
Allowance for Credit Losses 1,753 1,644
Held-to-maturity securities    
Held-to-Maturity    
Face Value 85,700  
B Piece bonds    
Held-to-Maturity    
Face Value 61,360 76,497
Net Carrying Value 47,615 57,839
Unrealized Gain 4,420 709
Estimated Fair Value 52,035 58,548
Allowance for Credit Losses $ 331 $ 621
Seven B Piece Bonds | Held-to-maturity securities    
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 6 years 2 months 12 days  
Initial face value of bonds purchased $ 106,200  
Agency B Piece Bonds | Held-to-maturity securities    
Held-to-Maturity    
Weighted average variable interest rate (as a percent) 3.74%  
Weighted average effective interest rate (as a percent) 11.32% 10.85%
Held-to-maturity securities, estimated fiscal year    
Within one year $ 11,200  
After one year through five years 28,800  
After five years through ten years 3,300  
After ten years 18,100  
APL certificates    
Held-to-Maturity    
Face Value 149,368 $ 63,627
Net Carrying Value 92,869 37,685
Unrealized Gain 5,007  
Unrealized Loss   (2,105)
Estimated Fair Value 97,876 35,580
Allowance for Credit Losses 1,422 1,023
APL certificates | Held-to-maturity securities    
Held-to-Maturity    
Face Value 149,400 $ 63,600
Net Carrying Value $ 91,400  
Weighted average variable interest rate (as a percent) 4.12%  
Estimated weighted average remaining maturity period 8 years 6 months  
Weighted average fixed interest rate 9.11% 10.15%
Held-to-maturity securities, estimated fiscal year    
After one year through five years $ 3,600  
After five years through ten years $ 145,800  
APL certificates | Held-to-maturity securities | Minimum    
Held-to-Maturity    
Securities maturity term 5 years  
APL certificates | Held-to-maturity securities | Maximum    
Held-to-Maturity    
Securities maturity term 10 years