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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, 2015
USD ($)
loan
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 250,966,112
Residential loans, count | loan 1,624,762
California [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 60,567,867
Residential loans, count | loan 234,371
Florida [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 21,004,999
Residential loans, count | loan 147,454
New York [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 20,735,251
Residential loans, count | loan 86,951
New Jersey [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 11,495,328
Residential loans, count | loan 55,175
Texas [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 11,393,316
Residential loans, count | loan 127,397
Other [Member]  
Mortgage Loans on Real Estate [Line Items]  
Amount | $ $ 125,769,351
Residential loans, count | loan 973,414