Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 3,490,082
Weighted-average maturity (in months)	3 months 3 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 715,649
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	2,469,343
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	191,861
Over 180 days to one year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	13,229
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 100,000