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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Segment Information
Servicing Portfolio UPB	$ 29,936,707	$ 27,998,029
Wtd. Avg. Servicing Fee Rate (basis points)	0.397%	0.411%
Wtd. Avg. Life of Servicing Portfolio (years)	8 years 3 months 18 days	8 years 7 months 6 days
SFR - Fixed Rate
Segment Information
Servicing Portfolio UPB	$ 287,942	$ 274,764
Wtd. Avg. Servicing Fee Rate (basis points)	0.201%	0.198%
Wtd. Avg. Life of Servicing Portfolio (years)	5 years 9 months 18 days	6 years
Fannie Mae
Segment Information
Servicing Portfolio UPB	$ 20,463,620	$ 19,038,124
Wtd. Avg. Servicing Fee Rate (basis points)	0.483%	0.502%
Wtd. Avg. Life of Servicing Portfolio (years)	7 years 8 months 12 days	8 years
Freddie Mac
Segment Information
Servicing Portfolio UPB	$ 5,184,888	$ 5,153,207
Wtd. Avg. Servicing Fee Rate (basis points)	0.242%	0.25%
Wtd. Avg. Life of Servicing Portfolio (years)	8 years 6 months	9 years
Private Label
Segment Information
Servicing Portfolio UPB	$ 2,371,475	$ 2,074,859
Wtd. Avg. Servicing Fee Rate (basis points)	0.192%	0.185%
Wtd. Avg. Life of Servicing Portfolio (years)	7 years 3 months 18 days	7 years 7 months 6 days
FHA
Segment Information
Servicing Portfolio UPB	$ 1,322,832	$ 1,155,893
Wtd. Avg. Servicing Fee Rate (basis points)	0.145%	0.149%
Wtd. Avg. Life of Servicing Portfolio (years)	19 years 10 months 24 days	19 years 6 months
Bridge loan
Segment Information
Servicing Portfolio UPB	$ 305,950	$ 301,182
Wtd. Avg. Servicing Fee Rate (basis points)	0.112%	0.125%
Wtd. Avg. Life of Servicing Portfolio (years)	3 years 7 months 6 days	1 year 8 months 12 days

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