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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Segment Information
UPB of Servicing Portfolio	$ 26,035,055	$ 24,628,456
Wtd. Avg. Servicing Fee Rate (basis points)	0.459%	45.40%
Wtd. Avg. Life of Servicing Portfolio (in years)	9 years	8 years 10 months 24 days
SFR - Fixed Rate
Segment Information
UPB of Servicing Portfolio	$ 75,103
Wtd. Avg. Servicing Fee Rate (basis points)	20.00%
Wtd. Avg. Life of Servicing Portfolio (in years)	5 years 10 months 24 days
Fannie Mae
Segment Information
UPB of Servicing Portfolio	$ 19,191,969	$ 18,268,268
Wtd. Avg. Servicing Fee Rate (basis points)	53.20%	52.30%
Wtd. Avg. Life of Servicing Portfolio (in years)	8 years 3 months 18 days	8 years 2 months 12 days
Freddie Mac
Segment Information
UPB of Servicing Portfolio	$ 4,708,457	$ 4,881,080
Wtd. Avg. Servicing Fee Rate (basis points)	28.50%	27.90%
Wtd. Avg. Life of Servicing Portfolio (in years)	9 years 9 months 18 days	9 years 10 months 24 days
Private Label
Segment Information
UPB of Servicing Portfolio	$ 1,176,627	$ 726,992
Wtd. Avg. Servicing Fee Rate (basis points)	20.00%	20.00%
Wtd. Avg. Life of Servicing Portfolio (in years)	9 years	8 years 8 months 12 days
FHA
Segment Information
UPB of Servicing Portfolio	$ 882,899	$ 752,116
Wtd. Avg. Servicing Fee Rate (basis points)	15.70%	16.30%
Wtd. Avg. Life of Servicing Portfolio (in years)	21 years	20 years 3 months 18 days

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