Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 7,138,415
Weighted-average maturity (in months)	2 months 21 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 1,444,994
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	4,953,472
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	133,483
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	540,960
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 65,506