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Related Party Transactions - Transactions with CCRE (Details) - USD ($)			3 Months Ended
	Aug. 16, 2019	Jul. 22, 2019	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction
Mortgage servicing right recognized			$ 11,963,000	$ 18,300,000
Third Party Bank And Cantor Commercial Real Estate LP
Related Party Transaction
Amount of loan purchased by third-party (in percentage)	80.00%
Amount of loan retained by third-party (in percentage)	20.00%
Interest rate on loans receivable (in percentage)	4.38%
Real Estate Loan | Third Party Bank And Cantor Commercial Real Estate LP
Related Party Transaction
Commercial real estate loan		$ 146,600,000
CCRE | Loan Referral Agreement
Related Party Transaction
Revenue from loan referral agreement			0	0
CCRE | Primary Servicing Rights
Related Party Transaction
MSR acquired			0	0
Mortgage servicing right recognized			800,000	$ 900,000
Affiliated Persons or Entities | Revenue Share Agreeement | CCRE
Related Party Transaction
Revenue from loan referral agreement			$ 0
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP
Related Party Transaction
Ownership interest of loans receivable (in percentage)		19.00%

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