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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Segment Information
Servicing Portfolio UPB	$ 31,384,995	$ 30,983,455
Wtd. Avg. Servicing Fee Rate (basis points)	0.388%	0.391%
Wtd. Avg. Life of Portfolio (years)	7 years 8 months 12 days	8 years
SFR - Fixed Rate
Segment Information
Servicing Portfolio UPB	$ 265,429	$ 287,446
Wtd. Avg. Servicing Fee Rate (basis points)	0.201%	0.201%
Wtd. Avg. Life of Portfolio (years)	5 years	5 years 1 month 6 days
Fannie Mae
Segment Information
Servicing Portfolio UPB	$ 21,548,221	$ 21,264,578
Wtd. Avg. Servicing Fee Rate (basis points)	0.471%	0.474%
Wtd. Avg. Life of Portfolio (years)	7 years 2 months 12 days	7 years 4 months 24 days
Freddie Mac
Segment Information
Servicing Portfolio UPB	$ 5,301,291	$ 5,181,933
Wtd. Avg. Servicing Fee Rate (basis points)	0.234%	0.24%
Wtd. Avg. Life of Portfolio (years)	7 years 8 months 12 days	8 years 6 months
Private Label
Segment Information
Servicing Portfolio UPB	$ 2,524,013	$ 2,510,449
Wtd. Avg. Servicing Fee Rate (basis points)	0.189%	0.195%
Wtd. Avg. Life of Portfolio (years)	6 years 3 months 18 days	6 years 8 months 12 days
FHA
Segment Information
Servicing Portfolio UPB	$ 1,365,329	$ 1,359,624
Wtd. Avg. Servicing Fee Rate (basis points)	0.144%	0.144%
Wtd. Avg. Life of Portfolio (years)	19 years	19 years 2 months 12 days
Bridge loan
Segment Information
Servicing Portfolio UPB	$ 380,712	$ 379,425
Wtd. Avg. Servicing Fee Rate (basis points)	0.109%	0.109%
Wtd. Avg. Life of Portfolio (years)	3 years 7 months 6 days	3 years 2 months 12 days

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