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Guarantees - Credit recourse - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Guarantor Obligations                
Adjustments To Indemnity Reserves On Loans Sold $ (3,411)   $ (3,029) $ (1,664) $ (6,482)      
Guarantee on loans sold or serviced with credit recourse                
Guarantor Obligations                
Valuation Allowances And Reserves Balance 45,461 $ 48,100 57,747 45,461 57,747 $ 56,230 $ 57,425 $ 58,820
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            
Serviced Mortgage Loans                
Guarantor Obligations                
Loans serviced 15,000,000     15,000,000   15,700,000    
Loans with Recourse                
Guarantor Obligations                
Loans serviced 1,200,000     1,200,000   $ 1,300,000    
Loans with Recourse | Serviced Mortgage Loans                
Guarantor Obligations                
Repurchased Loans $ 15,000   $ 4,000 $ 38,000 $ 13,000