Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) mo	Jun. 30, 2022 USD ($) mo	Jun. 30, 2023 USD ($) mo	Jun. 30, 2022 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.15%	1.45%	1.09%	1.52%
Weighted-Average Term Extension (in Months) | mo	172	180	173	179
Average amount capitalized as a result of a payment delay	$ 16,661	$ 22,997	$ 16,864	$ 23,372
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	2.50%	1.88%	1.83%	2.69%
Weighted-Average Term Extension (in Months) | mo	79	51	73	61
Average amount capitalized as a result of a payment delay	$ 14,819	$ 18,394	$ 14,636	$ 20,361
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.61%	0.78%	1.76%	0.53%
Average amount capitalized as a result of a payment delay	$ 14,450	$ 19,528	$ 15,228	$ 23,406
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.34%	1.81%	1.48%	1.87%
Weighted-Average Term Extension (in Months) | mo	172	183	179	185
Average amount capitalized as a result of a payment delay	$ 21,304	$ 22,666	$ 20,715	$ 24,310