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Servicing - Schedules of Geographic Concentration of the Loans (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 11,298,223 $ 8,096,883
% of Total 100.00% 100.00%
California | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 2,872,702 $ 2,146,371
California | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 25.40% 26.50%
Florida | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 1,357,888 $ 990,404
Florida | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 12.00% 12.20%
Arizona | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 562,655 $ 429,469
Arizona | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 5.00% 5.30%
Georgia | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 521,330 $ 407,651
Georgia | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 4.60% 5.00%
Washington | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 456,709 $ 362,370
Washington | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 4.00% 4.50%
New Jersey | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 415,090 $ 320,124
New Jersey | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 3.70% 4.00%
North Carolina | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 327,759 $ 261,013
North Carolina | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 2.90% 3.20%
Virginia | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 360,311 $ 241,844
Virginia | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 3.20% 3.00%
Colorado | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 305,980 $ 239,559
Colorado | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 2.70% 3.00%
Ohio | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 350,075 $ 227,069
Ohio | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 3.10% 2.80%
Other | Geographic Distribution, Foreign    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 2,800 $ 0
Other | Concentration Risk    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
UPB of Underlying Loans $ 3,767,724 $ 2,471,009
Other | Concentration Risk | Loans Underlying Servicing Assets    
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]    
% of Total 33.40% 30.50%