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Agreements and Transactions with Related Parties - 2019 Activity (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 21, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Agreements and Transactions with Related Parties
Interest income		$ 240,693	$ 321,292
Related Party
Agreements and Transactions with Related Parties
Amount invested						$ 4,200
Other Related Party Transactions | Bridge loan, six multifamily properties
Agreements and Transactions with Related Parties
UPB converted to a mezzanine loan					$ 2,000
Other Related Party Transactions | Related Party | Maturity date of August 2023 | One multifamily property
Agreements and Transactions with Related Parties
Principal amount				$ 35,400
Other Related Party Transactions | Related Party | Bridge loan, one multifamily property | Maturity date of August 2023
Agreements and Transactions with Related Parties
Variable rate, spread				3.50%
Other Related Party Transactions | Related Party | AMAC III | Mezzanine Loans
Agreements and Transactions with Related Parties
Principal amount					7,000
Other Related Party Transactions | Related Party | AMAC III | Bridge loan, one multifamily property
Agreements and Transactions with Related Parties
Principal amount					$ 34,000
Other Related Party Transactions | Chief executive officer | Mezzanine Loans | Maturity date of January 2024
Agreements and Transactions with Related Parties
Fixed rate of interest					10.00%
Other Related Party Transactions | Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | Minimum
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity					10.50%
Other Related Party Transactions | Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | Maximum
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity					12.00%
Other Related Party Transactions | Chief executive officer | Bridge loan, six multifamily properties | Maturity date of September 2019
Agreements and Transactions with Related Parties
Interest income		100	100
AMAC III | Other Related Party Transactions | Related Party
Agreements and Transactions with Related Parties
Amount invested					$ 30,000
Ownership interest, percentage					18.00%
Interest income		700	800
AMAC Holdings III LLC
Agreements and Transactions with Related Parties
Loss on investment		$ 900	$ 500
AMAC III | Other Related Party Transactions | Related Party
Agreements and Transactions with Related Parties
Payoffs and partial paydowns of principal	$ 300
Financing receivable, modified, future paydown	$ 1,700

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