v3.25.3
Mortgage Loans - Financial Effects of Single-Family Loan Restructurings Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.50% 0.50% 0.60% 0.60%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 146 months 168 months 151 months 168 months
Weighted average payment deferral or principal forbearance $ 27 $ 16 $ 23 $ 16
15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification   0.00%   0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 39 months 10 months 38 months 10 months
Weighted average payment deferral or principal forbearance $ 11 $ 9 $ 11 $ 13
Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.90% 1.10% 0.80% 1.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 165 months 255 months 166 months 235 months
Weighted average payment deferral or principal forbearance $ 18 $ 12 $ 15 $ 13