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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Average period to securitization     30 days      
MSRs retained $ 1,400 $ 3,600 $ 5,900 $ 18,600    
Percentage of loan transferred through securitization 60 days or more past due     7.40%   8.90%  
Loans held for investment, not pledged as collateral 78,100   $ 78,100   $ 83,800  
Pledged advance remittance period     2 days      
Mortgage servicing rights, at fair value 999,282 $ 598,147 $ 999,282 $ 598,147 671,962 $ 679,256
Advances 166,024   166,024   $ 211,793  
Residential Mortgage-Backed Securitization Trusts [Member]            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Mortgage servicing rights, at fair value 200   200      
Investment in residual securities of trusts 1,700   1,700      
Advances $ 1,200   $ 1,200