Mortgage Loans - Loan Restructuring - Financial Impacts (Details) - Single-family	3 Months Ended
	Mar. 31, 2023 USD ($) mo	Mar. 31, 2022 USD ($) mo
20- and 30-year or more, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.08%	1.59%
Weighted-Average Term Extension (in Months) | mo	175	178
Average Amount Capitalized as a Result of a Payment Delay	$ 16,984	$ 23,146
15-year or less, amortizing fixed-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	0.74%	0.88%
Weighted-Average Term Extension (in Months) | mo	54	52
Average Amount Capitalized as a Result of a Payment Delay	$ 14,558	$ 20,664
Adjustable-rate
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	2.00%	0.22%
Average Amount Capitalized as a Result of a Payment Delay	$ 15,629	$ 24,838
Other
Loans in Mortgage Portfolio [Line Items]
Weighted-Average Interest Rate Reduction	1.54%	1.62%
Weighted-Average Term Extension (in Months) | mo	185	186
Average Amount Capitalized as a Result of a Payment Delay	$ 20,269	$ 24,759