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Securities Held-To-Maturity - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
bond
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Held-to-Maturity Securities [Line Items]      
Held-to-maturity securities, face value $ 225,461   $ 229,521
Debt securities, held to maturity, nonaccrual 12,200    
Debt securities, held to maturity, nonaccrual, specific allowances 10,500    
Interest income, including the amortization of discount 3,700 $ 3,700  
APL certificates      
Schedule of Held-to-Maturity Securities [Line Items]      
Held-to-maturity securities, face value 192,791   $ 192,791
Amount purchased at a discount $ 119,000    
Weighted average variable interest rate (as a percent) 3.94%    
Estimated weighted average remaining maturity period 5 years 1 month 6 days    
Weighted average fixed interest rate 8.84%   8.84%
Maturing in one to five years $ 63,600    
Maturing in five to ten years $ 129,200    
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 11 years 10 months 24 days    
Bonds retained percentage 49.00%    
Initial face value of bonds purchased $ 106,200    
Number of B Piece bonds | bond 7    
Discounted value of bonds purchased $ 74,700    
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%   2.00%
Weighted average effective interest rate (as a percent) 2.32%    
After ten years $ 32,700