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Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family
12 Months Ended
Dec. 31, 2024
USD ($)
mo
Dec. 31, 2023
USD ($)
mo
Dec. 31, 2022
USD ($)
mo
20- and 30-year or more, amortizing fixed-rate      
Loans in Mortgage Portfolio [Line Items]      
Weighted-Average Interest Rate Reduction 0.68% 1.06% 1.42%
Weighted-Average Term Extension (in Months) | mo 161 171 179
Average amount capitalized as a result of a payment delay | $ $ 13,000 $ 16,186 $ 22,248
15-year or less, amortizing fixed-rate      
Loans in Mortgage Portfolio [Line Items]      
Weighted-Average Interest Rate Reduction 1.77% 1.62% 2.54%
Weighted-Average Term Extension (in Months) | mo 80 72 55
Average amount capitalized as a result of a payment delay | $ $ 10,534 $ 14,236 $ 19,276
Adjustable-rate      
Loans in Mortgage Portfolio [Line Items]      
Weighted-Average Interest Rate Reduction 2.55% 1.62% 0.70%
Weighted-Average Term Extension (in Months) | mo 0 0 0
Average amount capitalized as a result of a payment delay | $ $ 10,710 $ 14,608 $ 22,153
Other      
Loans in Mortgage Portfolio [Line Items]      
Weighted-Average Interest Rate Reduction 0.82% 1.36% 1.80%
Weighted-Average Term Extension (in Months) | mo 168 189 187
Average amount capitalized as a result of a payment delay | $ $ 18,511 $ 20,910 $ 22,773