Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 6,609,703
Weighted-average maturity (in months)	3 months
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 1,676,719
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	4,139,432
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	207,823
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	435,729
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 150,000