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Regulatory Requirements - Narrative (Details) $ in Millions	12 Months Ended	60 Months Ended
Regulatory Requirements - Narrative (Details) $ in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Third party monitoring costs		$ 177.5
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	$ 172.3	172.3
Percentage Portfolio of Loans Serviced or Subserviced	2.00%
California Department of Business Oversight [Member]
Loss Contingencies [Line Items]
Amount of debt forgiveness for borrowers	$ 198.0	198.0
Outstanding amount of debt forgiveness for borrowers	$ 15.0	$ 15.0