Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 6,414,295
Weighted-average maturity (in months)	2 months 21 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 1,829,545
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	3,986,816
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	147,757
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	193,771
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 256,406