Short-Term Debt - Mortgage Loans Sold Under Agreement to Repurchase by Counterparty (Details) - Loan Repo Facility $ in Thousands	Jun. 30, 2023 USD ($)
Atlas Securitized Products L.P. & Citibank, N.A. & Goldman Sachs Bank USA
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 3,580,863
Atlas Securitized Products L.P. #2
Mortgage loans sold under agreement to repurchase
Amount at risk	312,426
Bank of America, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	100,954
JP Morgan Chase Bank
Mortgage loans sold under agreement to repurchase
Amount at risk	7,029
JP Morgan
Mortgage loans sold under agreement to repurchase
Amount at risk	10,883
BNP Paribas
Mortgage loans sold under agreement to repurchase
Amount at risk	6,393
Atlas Securitized Products, L.P.
Mortgage loans sold under agreement to repurchase
Amount at risk	77,346
Barclays
Mortgage loans sold under agreement to repurchase
Amount at risk	21,248
Goldman Sachs
Mortgage loans sold under agreement to repurchase
Amount at risk	3,062
Citibank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	2,804
Morgan Stanley Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	7,810
Royal Bank of Canada
Mortgage loans sold under agreement to repurchase
Amount at risk	16,897
Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 21,712