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Note Guarantees (Credit recourse) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Guarantee on loans sold or serviced with credit recourse        
Guarantor Obligations [Line Items]        
Valuation Allowances And Reserves Balance $ 51,540 $ 57,994 $ 54,489 $ 58,663
Serviced Mortgage Loans        
Guarantor Obligations [Line Items]        
Loans serviced 17,700,000   18,000,000  
Loans with Recourse        
Guarantor Obligations [Line Items]        
Loans serviced 1,600,000   $ 1,700,000  
Loans with Recourse | Serviced Mortgage Loans        
Guarantor Obligations [Line Items]        
Repurchased Loans $ 9,000 $ 13,000