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Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Securities Held-to-Maturity    
Face Value $ 234,255 $ 210,728
Net Carrying Value 156,547 140,484
Unrealized Gain   9,427
Unrealized Loss (11,976)  
Estimated Fair Value 144,571 149,911
Allowance for Credit Losses 3,153 1,753
B Piece bonds    
Securities Held-to-Maturity    
Face Value 41,464 61,360
Net Carrying Value 33,072 47,615
Unrealized Gain 1,372 4,420
Estimated Fair Value 34,444 52,035
Allowance for Credit Losses $ 370 $ 331
Seven B Piece Bonds | Held-to-Maturity Securities    
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    
Securities Held-to-Maturity    
Weighted average variable interest rate (as a percent) 3.74%  
Weighted average effective interest rate (as a percent) 12.20% 11.32%
Held-to-maturity securities, estimated fiscal year    
Within one year $ 7,500  
After one year through five years 16,400  
After five years through ten years 500  
After ten years 17,100  
APL certificates    
Securities Held-to-Maturity    
Face Value 192,791 $ 149,368
Net Carrying Value 123,475 92,869
Unrealized Gain   5,007
Unrealized Loss (13,348)  
Estimated Fair Value 110,127 97,876
Allowance for Credit Losses 2,783 $ 1,422
APL certificates | Held-to-Maturity Securities    
Securities Held-to-Maturity    
Face Value $ 192,800  
Weighted average variable interest rate (as a percent) 3.94%  
Estimated weighted average remaining maturity period 7 years 6 months  
Amount purchased at a discount $ 119,000  
Weighted average fixed interest rate 8.85% 9.11%
Held-to-maturity securities, estimated fiscal year    
After one year through five years $ 6,700  
After five years through ten years $ 186,100  
APL certificates | Held-to-Maturity Securities | Minimum    
Securities Held-to-Maturity    
Securities maturity term 5 years  
APL certificates | Held-to-Maturity Securities | Maximum    
Securities Held-to-Maturity    
Securities maturity term 10 years