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Guarantees - Credit recourse - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Guarantee on loans sold or serviced with credit recourse        
Guarantor Obligations        
Valuation allowances and reserves balance $ 10,335,000 $ 20,244,000 $ 11,800,000 $ 22,484,000
Serviced mortgage loans        
Guarantor Obligations        
Loans serviced 11,900,000,000   12,100,000,000  
Loans with recourse | Serviced mortgage loans        
Guarantor Obligations        
Repurchased loans 3,000,000 8,000,000    
Loans with recourse | Residential mortgage loans        
Guarantor Obligations        
Loans serviced 700,000,000   $ 700,000,000  
Securitization | Guarantee on loans sold or serviced with representation and warranties        
Guarantor Obligations        
Repurchased loans $ 927,000 $ 0