Short-Term Debt - Mortgage Loans Sold Under Agreement to Repurchase by Counterparty (Details) - Loan Repo Facility $ in Thousands	Jun. 30, 2026 USD ($)
Atlas Securitized Products, L.P., Goldman Sachs Bank USA, Nomura Corporate Funding Americas and Mizuho Bank, Ltd., Barclays Bank PLC
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 6,587,150
Atlas Securitized Products, L.P.
Mortgage loans sold under agreement to repurchase
Amount at risk	103,365
Bank of America, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	119,545
Royal Bank of Canada
Mortgage loans sold under agreement to repurchase
Amount at risk	33,415
JP Morgan Chase Bank, N.A
Mortgage loans sold under agreement to repurchase
Amount at risk	21,034
Morgan Stanley Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	29,039
Barclays Capital
Mortgage loans sold under agreement to repurchase
Amount at risk	986,064
BNP Paribas
Mortgage loans sold under agreement to repurchase
Amount at risk	21,631
Nomura Corporate Funding Americas
Mortgage loans sold under agreement to repurchase
Amount at risk	57,828
Mizuho Bank, Ltd.
Mortgage loans sold under agreement to repurchase
Amount at risk	17,884
Goldman Sachs
Mortgage loans sold under agreement to repurchase
Amount at risk	11,993
Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	28,711
Citibank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 9,314