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Mortgage Servicing - Summary of Geographic Distributions of UPB and Count of Residential Loans and Real Estate Serviced (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]      
Amount $ 209,185,063 $ 251,071,380 $ 398,877,464
Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 209,092,130 $ 250,966,112 $ 398,727,727
Residential loans, count | loan 1,393,766    
California [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 48,094,471    
Residential loans, count | loan 191,031    
New York [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 18,741,164    
Residential loans, count | loan 79,197    
Florida [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 17,282,020    
Residential loans, count | loan 126,949    
New Jersey [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 10,254,163    
Residential loans, count | loan 49,857    
Texas [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 9,522,228    
Residential loans, count | loan 109,763    
Other [Member] | Residential Mortgage [Member]      
Mortgage Loans on Real Estate [Line Items]      
Amount $ 105,198,084    
Residential loans, count | loan 836,969