Short-Term Debt - Principal only stripped MBS (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Bank of America, N.A. | Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 2,602
JP Morgan Chase Bank, N.A | Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	23,009
Wells Fargo Bank, N.A. | Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	21,452
Santander US Capital Markets LLC | Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	11,970
Loan Repo Facility | Bank of America, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	131,432
Loan Repo Facility | Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 24,140