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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Segment Information
Servicing Portfolio UPB	$ 33,011,759	$ 30,983,455
Wtd. Avg. Servicing Fee Rate (basis points)	0.38%	0.391%
Wtd. Avg. Life of Portfolio (years)	7 years 1 month 6 days	8 years
SFR - Fixed Rate
Segment Information
Servicing Portfolio UPB	$ 275,081	$ 287,446
Wtd. Avg. Servicing Fee Rate (basis points)	0.201%	0.201%
Wtd. Avg. Life of Portfolio (years)	4 years 7 months 6 days	5 years 1 month 6 days
Fannie Mae
Segment Information
Servicing Portfolio UPB	$ 22,526,022	$ 21,264,578
Wtd. Avg. Servicing Fee Rate (basis points)	0.466%	0.474%
Wtd. Avg. Life of Portfolio (years)	6 years 7 months 6 days	7 years 4 months 24 days
Freddie Mac
Segment Information
Servicing Portfolio UPB	$ 5,820,026	$ 5,181,933
Wtd. Avg. Servicing Fee Rate (basis points)	0.219%	0.24%
Wtd. Avg. Life of Portfolio (years)	7 years 1 month 6 days	8 years 6 months
Private Label
Segment Information
Servicing Portfolio UPB	$ 2,619,485	$ 2,510,449
Wtd. Avg. Servicing Fee Rate (basis points)	0.187%	0.195%
Wtd. Avg. Life of Portfolio (years)	5 years 9 months 18 days	6 years 8 months 12 days
FHA
Segment Information
Servicing Portfolio UPB	$ 1,390,766	$ 1,359,624
Wtd. Avg. Servicing Fee Rate (basis points)	0.142%	0.144%
Wtd. Avg. Life of Portfolio (years)	18 years 10 months 24 days	19 years 2 months 12 days
Bridge loan
Segment Information
Servicing Portfolio UPB	$ 380,379	$ 379,425
Wtd. Avg. Servicing Fee Rate (basis points)	0.109%	0.109%
Wtd. Avg. Life of Portfolio (years)	3 years	3 years 2 months 12 days

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