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Regulatory Requirements - Narrative (Details)
$ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Brokers and Dealers [Abstract]    
Third party monitoring costs related to regulatory matters and resolutions   $ 171.0
Number of days from fiscal year end that servicer is obliged to provide audited financial statements 90 days  
Capital requirement based on outstanding UPB of owned and subserviced portfolio $ 344.7 $ 344.7