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Securities Held-to-Maturity (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Securities Held-to-Maturity    
Face Value $ 232,541,000 $ 234,255,000
Net Carrying Value 153,888,000 156,547,000
Unrealized Loss (12,925,000) (11,976,000)
Estimated Fair Value 140,963,000 144,571,000
B Piece bonds    
Securities Held-to-Maturity    
Face Value 39,750,000 41,464,000
Net Carrying Value 29,770,000 33,072,000
Unrealized Gain 3,253,000 1,372,000
Estimated Fair Value $ 33,023,000 $ 34,444,000
Seven B Piece Bonds | Held-to-Maturity Securities    
Securities Held-to-Maturity    
Bonds retained percentage 49.00%  
Number of B Piece bonds | item 7  
Discounted value of bonds purchased $ 74,700,000  
Remaining of B Piece bond sold to the third party at par 51.00%  
Estimated weighted average remaining maturity period 6 years  
Initial face value of bonds purchased $ 106,200,000  
Agency B Piece Bonds    
Securities Held-to-Maturity    
Weighted average variable interest rate (as a percent)   12.20%
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) 11.43%  
Held-to-maturity securities, estimated fiscal year    
Within one year $ 7,300,000  
After one year through five years 15,800,000  
After five years through ten years 400,000  
After ten years 16,300,000  
APL certificates    
Securities Held-to-Maturity    
Face Value 192,791,000 $ 192,791,000
Net Carrying Value 124,118,000 123,475,000
Unrealized Loss (16,178,000) (13,348,000)
Estimated Fair Value 107,940,000 $ 110,127,000
APL certificates | Held-to-Maturity Securities    
Securities Held-to-Maturity    
Face Value $ 192,800,000  
Weighted average variable interest rate (as a percent) 3.94%  
Estimated weighted average remaining maturity period 7 years 3 months 18 days  
Amount purchased at a discount $ 119,000,000.0  
Weighted average fixed interest rate 8.85%  
Held-to-maturity securities, estimated fiscal year    
After one year through five years $ 6,700,000  
After five years through ten years $ 186,100,000  
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