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Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family
3 Months Ended
Mar. 31, 2025
USD ($)
mo
Mar. 31, 2024
USD ($)
mo
20- and 30-year or more, amortizing fixed-rate    
Loans in Mortgage Portfolio [Line Items]    
Weighted-Average Interest Rate Reduction 0.63% 1.04%
Weighted-Average Term Extension (in Months) | mo 157 163
Average amount capitalized as a result of a payment delay $ 12,403 $ 13,886
15-year or less, amortizing fixed-rate    
Loans in Mortgage Portfolio [Line Items]    
Weighted-Average Interest Rate Reduction 1.13% 1.54%
Weighted-Average Term Extension (in Months) | mo 65 83
Average amount capitalized as a result of a payment delay $ 8,660 $ 13,893
Adjustable-rate    
Loans in Mortgage Portfolio [Line Items]    
Weighted-Average Interest Rate Reduction 0.00% 2.00%
Average amount capitalized as a result of a payment delay $ 10,333 $ 13,238
Other    
Loans in Mortgage Portfolio [Line Items]    
Weighted-Average Interest Rate Reduction 1.00% 1.19%
Weighted-Average Term Extension (in Months) | mo 174 172
Average amount capitalized as a result of a payment delay $ 11,647 $ 17,515