Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended	6 Months Ended
Jun. 30, 2025 USD ($) mo	Jun. 30, 2024 USD ($) mo	Jun. 30, 2025 USD ($) mo	Jun. 30, 2024 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.60%	0.74%	0.61%	0.87%
Weighted-Average Term Extension (in Months) \| mo	145	160	150	161
Average amount capitalized as a result of a payment delay	$ 13,775	$ 13,518	$ 13,061	$ 13,675
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.18%	2.72%	1.17%	2.00%
Weighted-Average Term Extension (in Months) \| mo	52	87	53	85
Average amount capitalized as a result of a payment delay	$ 10,121	$ 10,601	$ 9,431	$ 12,450
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.31%	0.00%	1.31%	2.00%
Average amount capitalized as a result of a payment delay	$ 11,166	$ 10,062	$ 10,487	$ 11,822
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.29%	0.52%	1.13%	0.82%
Weighted-Average Term Extension (in Months) \| mo	135	143	158	157
Average amount capitalized as a result of a payment delay	$ 14,693	$ 18,995	$ 12,930	$ 17,970