Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 4,418,297
Weighted-average maturity (in months)	3 months 18 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 700,101
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	3,248,232
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	57,266
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 412,698