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Note Guarantees (Credit recourse) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Guarantee on loans sold or serviced with credit recourse      
Guarantor Obligations      
Valuation Allowances And Reserves Balance $ 56,230 $ 58,820 $ 54,489
Serviced Mortgage Loans      
Guarantor Obligations      
Loans serviced 15,700,000 16,100,000  
Loans with Recourse      
Guarantor Obligations      
Loans serviced 1,300,000 1,500,000  
Loans with Recourse | Serviced Mortgage Loans      
Guarantor Obligations      
Repurchased Loans $ 27,000 $ 29,000