Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) mo	Sep. 30, 2023 USD ($) mo	Sep. 30, 2024 USD ($) mo	Sep. 30, 2023 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.59%	1.05%	0.72%	1.08%
Weighted-Average Term Extension (in Months) | mo	160	167	161	171
Average amount capitalized as a result of a payment delay	$ 12,928	$ 16,464	$ 13,408	$ 16,798
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.03%	2.41%	1.82%	2.22%
Weighted-Average Term Extension (in Months) | mo	77	52	84	70
Average amount capitalized as a result of a payment delay	$ 9,652	$ 14,218	$ 11,538	$ 14,588
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	2.88%	1.97%	2.58%	1.29%
Average amount capitalized as a result of a payment delay	$ 11,157	$ 12,980	$ 11,508	$ 14,823
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.96%	1.04%	0.86%	1.31%
Weighted-Average Term Extension (in Months) | mo	182	199	162	188
Average amount capitalized as a result of a payment delay	$ 21,043	$ 23,072	$ 18,705	$ 21,396