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Guarantees - Credit recourse - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Guarantor Obligations                
Adjustments To Indemnity Reserves On Loans Sold $ 4,183 $ (3,411) $ (1,770) $ (1,664)        
Bulk loan repurchase                
Guarantor Obligations                
Provision for recourse liability 5,100              
Guarantee on loans sold or serviced with credit recourse                
Guarantor Obligations                
Valuation Allowances And Reserves Balance 26,885 45,461 26,885 45,461 $ 31,305 $ 34,862 $ 48,100 $ 56,230
Provision for recourse liability (4,058) 2,755 1,356 3,711        
Serviced Mortgage Loans                
Guarantor Obligations                
Loans serviced 13,100,000   13,100,000     14,800,000    
Loans with Recourse                
Guarantor Obligations                
Loans serviced 900,000   900,000     $ 1,200,000    
Loans with Recourse | Serviced Mortgage Loans                
Guarantor Obligations                
Repurchased Loans 131,000 $ 15,000 $ 143,000 $ 38,000        
Loans with Recourse | Serviced Mortgage Loans | Bulk loan repurchase                
Guarantor Obligations                
Repurchased Loans $ 120,000