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Securities Held-to-Maturity - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Held-to-Maturity Securities [Line Items]      
Held-to-maturity securities, face value $ 230,495,000 $ 234,255,000  
Impairment of held-to-maturity securities 0    
Interest income (including the amortization of discount) 13,600,000 18,600,000 $ 13,200,000
APL certificates      
Schedule of Held-to-Maturity Securities [Line Items]      
Held-to-maturity securities, face value 192,791,000 $ 192,791,000  
Amount purchased at a discount $ 119,000,000    
Weighted average variable interest rate (as a percent) 3.94%    
Estimated weighted average remaining maturity period 6 years 7 months 6 days    
Weighted average fixed interest rate 8.85% 8.85%  
After one year through five years $ 19,700,000    
After five years through ten years $ 173,100,000    
APL certificates | Minimum      
Schedule of Held-to-Maturity Securities [Line Items]      
Securities maturity term 5 years    
APL certificates | Maximum      
Schedule of Held-to-Maturity Securities [Line Items]      
Securities maturity term 10 years    
Seven B Piece Bonds      
Schedule of Held-to-Maturity Securities [Line Items]      
Estimated weighted average remaining maturity period 6 years 1 month 6 days    
Bonds retained percentage 49.00%    
Initial face value of bonds purchased $ 106,200,000    
Discounted value of bonds purchased $ 74,700,000    
Held-to-maturity securities sold, percentage 51.00%    
Agency B Piece Bonds      
Schedule of Held-to-Maturity Securities [Line Items]      
Weighted average variable interest rate (as a percent) 3.74%    
After one year through five years $ 11,400,000    
Weighted average effective interest rate 11.28% 12.20%  
Within one year $ 5,900,000    
After ten years $ 20,400,000