Short-Term Debt - Maturities of Outstanding Advances Under Repurchase Agreements (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 3,786,306
Weighted-average maturity (in months)	4 months 6 days
Within 30 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 678,162
Over 30 to 90 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	2,652,552
Over 90 to 180 days
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	2,758
Over one year to two year
Mortgage loans sold under agreement to repurchase
Unpaid principal balance	$ 452,834