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Guarantees - Credit recourse - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Guarantor Obligations        
Valuation Allowances And Reserves Balance   $ 35,000 $ 56,000  
Adjustments To Indemnity Reserves On Loans Sold   (343) (12,959) $ (22,377)
Guarantee on loans sold or serviced with credit recourse        
Guarantor Obligations        
Valuation Allowances And Reserves Balance   34,862 56,230 $ 58,820
Serviced Mortgage Loans        
Guarantor Obligations        
Loans serviced   14,800,000 15,700,000  
Serviced Mortgage Loans | Guarantee on loans sold or serviced with credit recourse | Guarantee on loans sold or serviced with representation and warranties        
Guarantor Obligations        
Adjustments To Indemnity Reserves On Loans Sold $ 4,400      
Loans with Recourse        
Guarantor Obligations        
Loans serviced   1,200,000 1,300,000  
Loans with Recourse | Serviced Mortgage Loans        
Guarantor Obligations        
Repurchased Loans   $ 57,000 $ 27,000