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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jul. 01, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Average period to securitization     30 days      
MSRs retained $ 605 $ 1,427 $ 2,249 $ 5,880    
Percentage of loan transferred through securitization 60 days or more past due     8.30%   8.30%  
Pledged advance remittance period     2 days      
Maximum borrowing capacity           $ 300,000
Total Financing liabilities 6,973,559   $ 6,973,559   $ 6,508,061  
MSRs 1,455,553   1,455,553   1,457,149  
Unamortized debt issuance costs 1,100   1,100      
Secured Debt [Member]            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Total Financing liabilities 243,198   243,198   155,713  
Unamortized debt issuance costs 2,861   2,861   3,098  
Secured Debt [Member] | Agency Mortgage Servicing Rights Financing Facility [Member]            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Short-term debt 137,612   137,612   $ 0  
MSRs $ 192,600   $ 192,600