Mortgage Loans Held for Portfolio (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for credit losses		$ (2,200)	$ (2,200)
Total mortgage loans, net of allowance for credit losses		$ 3,765,267	$ 3,679,150
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Accrued interest receivable	Accrued interest receivable
Fixed-rate 15-year single-family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Original contractual terms		15 years
Fixed-rate 20- and 30-year single-family mortgages | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Original contractual terms		20 years
Fixed-rate 20- and 30-year single-family mortgages | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Original contractual terms		30 years
Residential Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Par Value		$ 3,729,019	$ 3,643,537
Premiums		45,476	44,801
Discounts		(6,218)	(5,921)
Deferred derivative losses, net		(810)	(1,067)
Total mortgage loans held for portfolio	[1]	3,767,467	3,681,350
Less: Allowance for credit losses		(2,200)	(2,200)
Total mortgage loans, net of allowance for credit losses		3,765,267	3,679,150
Mortgage loans held for portfolio, accrued interest receivable		24,700	23,800
Single Family [Member] | Fixed-rate 15-year single-family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Par Value		150,676	158,349
Single Family [Member] | Fixed-rate 20- and 30-year single-family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Par Value		$ 3,578,343	$ 3,485,188

[1]     Excludes accrued interest receivable of $24.7 million and $23.8 million at March 31, 2025, and December 31, 2024, respectively.