Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) mo	Jun. 30, 2023 USD ($) mo	Jun. 30, 2024 USD ($) mo	Jun. 30, 2023 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.74%	1.15%	0.87%	1.09%
Weighted-Average Term Extension (in Months) | mo	160	172	161	173
Average amount capitalized as a result of a payment delay	$ 13,518	$ 16,661	$ 13,675	$ 16,864
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	2.72%	2.50%	2.00%	1.83%
Weighted-Average Term Extension (in Months) | mo	87	79	85	73
Average amount capitalized as a result of a payment delay	$ 10,601	$ 14,819	$ 12,450	$ 14,636
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.00%	1.61%	2.00%	1.76%
Average amount capitalized as a result of a payment delay	$ 10,062	$ 14,450	$ 11,822	$ 15,228
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.52%	1.34%	0.82%	1.48%
Weighted-Average Term Extension (in Months) | mo	143	172	157	179
Average amount capitalized as a result of a payment delay	$ 18,995	$ 21,304	$ 17,970	$ 20,715