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Summary of Significant Accounting Policies - VIE & Fair Value (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Variable Interest Entities  
REO assets as a percent of consolidated VIE assets 4.00%
Loans as a percent of consolidated VIE assets 96.00%
Fair Value Measurements  
Permitted reinvestment under static investment in VIEs $ 0.0