Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 5,441,126
Weighted-average maturity (in months)	3 months 15 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 1,291,192
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	3,225,500
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	139,760
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	210,923
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 573,751