Mortgage Loans - Financial Effects of Single-Family Loan Restructurings Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
20- and 30-year or more, amortizing fixed-rate
financing receivable, loan restructuring [Line Items]
Weighted average interest rate reduction	0.60%	0.50%	1.00%
Weighted average term extension	150 months	168 months	175 months
Weighted average payment deferral or principal forbearance	$ 25	$ 16	$ 16
15-year or less, amortizing fixed-rate
financing receivable, loan restructuring [Line Items]
Weighted average interest rate reduction		0.00%	0.00%
Weighted average term extension	36 months	10 months	0 months
Weighted average payment deferral or principal forbearance	$ 11	$ 12	$ 15
Adjustable-rate and other
financing receivable, loan restructuring [Line Items]
Weighted average interest rate reduction	0.80%	1.00%	1.60%
Weighted average term extension	145 months	229 months	202 months
Weighted average payment deferral or principal forbearance	$ 14	$ 15	$ 17

financing receivable, loan restructuring

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- Definition

Weighted average payment deferral or principal forbearance for loans restructured during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Details

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