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Mortgage Servicing Rights - Additional Information (Details) - USD ($)
3 Months Ended
Oct. 02, 2016
Sep. 29, 2016
Dec. 31, 2016
Oct. 01, 2016
Sep. 30, 2016
Servicing Assets at Fair Value [Line Items]          
Serviced mortgage loan held for sale   $ 2,400,000,000      
Mortgage servicing rights estimated fair value         $ 32,600,000
Scenario Forecast          
Servicing Assets at Fair Value [Line Items]          
Transactions related expenses     $ 2,600,000    
Subsequent Event          
Servicing Assets at Fair Value [Line Items]          
Serviced mortgage loan held for sale $ 1,300,000,000        
Aggregate notional value       $ 130,000