Short-Term Debt - Mortgage Loans Sold Under Agreement to Repurchase by Counterparty (Details) - Loan Repo Facility $ in Thousands	Jun. 30, 2024 USD ($)
Atlas Securitized Products, L.P., Goldman Sachs Bank USA & Nomura Corporate Funding Americas
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 5,252,807
Bank of America, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	108,009
Atlas Securitized Products, L.P.
Mortgage loans sold under agreement to repurchase
Amount at risk	62,961
Barclays
Mortgage loans sold under agreement to repurchase
Amount at risk	44,030
Morgan Stanley Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	40,467
Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	17,568
BNP Paribas
Mortgage loans sold under agreement to repurchase
Amount at risk	28,617
JP Morgan
Mortgage loans sold under agreement to repurchase
Amount at risk	27,772
Royal Bank of Canada
Mortgage loans sold under agreement to repurchase
Amount at risk	28,422
Citibank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	13,261
Goldman Sachs
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 8,921