Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 7,064,948
Weighted-average maturity (in months)	3 months 12 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 1,498,129
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	4,863,578
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	184,880
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	55,015
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 463,346