Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended
	Mar. 31, 2026 USD ($) mo	Mar. 31, 2025 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.63%	0.63%
Weighted-Average Term Extension (in Months) \| mo	145	157
Average amount capitalized as a result of a payment delay \| $	$ 13,514	$ 12,403
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.95%	1.13%
Weighted-Average Term Extension (in Months) \| mo	52	65
Average amount capitalized as a result of a payment delay \| $	$ 11,192	$ 8,660
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.64%	0.00%
Weighted-Average Term Extension (in Months) \| mo	0	0
Average amount capitalized as a result of a payment delay \| $	$ 10,770	$ 10,333
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.66%	1.00%
Weighted-Average Term Extension (in Months) \| mo	139	174
Average amount capitalized as a result of a payment delay \| $	$ 13,866	$ 11,647