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Guarantees - Credit recourse - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Guarantee on loans sold or serviced with credit recourse                
Guarantor Obligations                
Valuation allowances and reserves balance $ 15,662,000 $ 31,305,000 $ 15,662,000 $ 31,305,000 $ 20,244,000 $ 22,484,000 $ 31,719,000 $ 34,862,000
Serviced mortgage loans                
Guarantor Obligations                
Loans serviced 12,500,000,000   12,500,000,000     12,900,000,000    
Loans with recourse                
Guarantor Obligations                
Loans serviced 800,000,000   800,000,000     $ 900,000,000    
Loans with recourse | Serviced mortgage loans                
Guarantor Obligations                
Repurchased loans 7,000,000 4,000,000 15,000,000 11,000,000        
Securitization | Guarantee on loans sold or serviced with representation and warranties                
Guarantor Obligations                
Repurchased loans $ 0 $ 0 $ 0 $ 0