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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Average period to securitization     30 days      
MSRs retained $ 800 $ 2,100 $ 1,600 $ 4,500    
Percentage of loan transferred through securitization 60 days or more past due     8.90%   8.30%  
Pledged advance remittance period     2 days      
Mortgage servicing rights, at fair value 1,312,633 $ 1,043,995 $ 1,312,633 $ 1,043,995 $ 1,457,149 $ 671,962
Advances 229,167   229,167   $ 249,382  
Residential Mortgage Backed Securitization Trusts [Member]            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Mortgage servicing rights, at fair value 100   100      
Investment in residual securities of trusts 1,600   1,600      
Advances $ 1,300   $ 1,300