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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Segment Information
UPB of Servicing Portfolio	$ 17,794,681	$ 16,206,315
Wtd. Avg. Servicing Fee Rate (basis points)	0.462%	0.477%
Wtd. Avg. Life of Servicing Portfolio (in years)	8 years 9 months 18 days	8 years 1 month 6 days
Fannie Mae
Segment Information
UPB of Servicing Portfolio	$ 13,195,643	$ 12,502,699
Wtd. Avg. Servicing Fee Rate (basis points)	0.523%	0.536%
Wtd. Avg. Life of Servicing Portfolio (in years)	7 years 8 months 12 days	6 years 10 months 24 days
Freddie Mac
Segment Information
UPB of Servicing Portfolio	$ 3,977,619	$ 3,166,134
Wtd. Avg. Servicing Fee Rate (basis points)	0.308%	0.295%
Wtd. Avg. Life of Servicing Portfolio (in years)	11 years	10 years 6 months
FHA
Segment Information
UPB of Servicing Portfolio	$ 621,419	$ 537,482
Wtd. Avg. Servicing Fee Rate (basis points)	0.157%	0.165%
Wtd. Avg. Life of Servicing Portfolio (in years)	20 years 1 month 6 days	19 years 7 months 6 days

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Amount of unpaid principal balance of servicing portfolio.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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