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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Information
UPB of Servicing Portfolio	$ 20,059,077	$ 18,601,641
Wtd. Avg. Servicing Fee Rate (basis points)	0.438%	0.452%
Wtd. Avg. Life of Servicing Portfolio (in years)	8 years 9 months 18 days	8 years 7 months 6 days
Fannie Mae
Segment Information
UPB of Servicing Portfolio	$ 14,832,844	$ 13,562,667
Wtd. Avg. Servicing Fee Rate (basis points)	0.493%	0.513%
Wtd. Avg. Life of Servicing Portfolio (in years)	7 years 9 months 18 days	7 years 4 months 24 days
Freddie Mac
Segment Information
UPB of Servicing Portfolio	$ 4,534,714	$ 4,394,287
Wtd. Avg. Servicing Fee Rate (basis points)	0.30%	0.308%
Wtd. Avg. Life of Servicing Portfolio (in years)	10 years 7 months 6 days	10 years 9 months 18 days
FHA
Segment Information
UPB of Servicing Portfolio	$ 691,519	$ 644,687
Wtd. Avg. Servicing Fee Rate (basis points)	0.154%	0.155%
Wtd. Avg. Life of Servicing Portfolio (in years)	18 years 8 months 12 days	19 years 7 months 6 days

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- Definition

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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