Agreements and Transactions with Related Parties - Other Related Party (Details) $ in Thousands	1 Months Ended										3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2021 USD ($)	Jan. 31, 2021	Mar. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jun. 30, 2018 USD ($) property loan	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) item loan property	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)
Agreements and transactions with related parties
Due from related party					$ 84,318						$ 24,740			$ 24,740
Due to related party					26,570						5,564			5,564
Base spread (as a percent)						3.00%
Proceeds from bridge loan on a multi family property			$ 50,000			$ 67,000
Investment made														$ 5,418,113	$ 5,174,313
Indirect ownership percentage														9.20%
Distribution received											5,000			$ 11,000
CMBS/Conduit
Agreements and transactions with related parties
Loans assumed					26,000
Retail property
Agreements and transactions with related parties
Property purchased					$ 32,500
Mature date of April 2030 | Private Label
Agreements and transactions with related parties
Fixed rate of interest (as a percent)																3.10%
Maturity date of March 2030 | Private Label | Lexford Portfolio
Agreements and transactions with related parties
Principal amount								$ 34,600
Fixed rate of interest (as a percent)								3.30%
Maturity date of March 2025 | SOFR
Agreements and transactions with related parties
Base spread (as a percent)	5.50%
Bridge loans | Single-Family Rental
Agreements and transactions with related parties
Interest income recorded												$ 300			1,000
Loan committed														10,000		$ 32,500
Loan committed upsized											41,500			41,500
Investment made																$ 3,500
Bridge loans | Maturity date of June 2021 | Lexford Portfolio
Agreements and transactions with related parties
Base spread (as a percent)										4.00%
Paydowns of principal made by borrower																	$ 250,000
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners											50,000			50,000
Distribution received											11,000
Bridge loan, six multifamily properties
Agreements and transactions with related parties
UPB converted to a mezzanine loan									$ 2,000
ACM, Certain executives and Consortium of independent outside investors | AMAC III
Agreements and transactions with related parties
Interest income recorded											500	300		1,200	900
Amount invested											$ 25,200			$ 25,200			$ 30,000
Ownership interest (as a percent)											18.00%			18.00%
ACM, Certain executives and Consortium of independent outside investors | Private Label | AMAC III
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																	100.00%
Fixed rate of interest (as a percent)																	3.735%
Amount of loan to related party																	$ 15,600
ACM, Certain executives and Consortium of independent outside investors | Mature date of April 2030 | Private Label
Agreements and transactions with related parties
Principal amount													$ 63,400
ACM, Certain executives and Consortium of independent outside investors | Mezzanine loans | Mature date of April 2030
Agreements and transactions with related parties
Fixed rate of interest (as a percent)																9.00%
ACM, Certain executives and Consortium of independent outside investors | AMAC III
Agreements and transactions with related parties
Loss on investment											$ 700			$ 1,800
ACM | Residential Mortgage Banking Company
Agreements and transactions with related parties
Interest income recorded											300	5,400		6,400	32,700
Acquisition purchase price																					$ 9,600
Noncontrolling interest in equity method investment acquired (as a percent)																					50.00%
Indirect ownership percentage							12.30%														22.50%
Cash distribution received											$ 7,300	4,700		$ 22,300	23,400
ACM | ACM Acquisition
Agreements and transactions with related parties
Number of shares held by related party | shares											2,535,870			2,535,870
OP units hold as part of acquisition | shares														10,634,024
Aggregate percentage of voting power held by related party											7.00%			7.00%
ACM | Preferred equity investments | Single-Family Rental
Agreements and transactions with related parties
Investment made																$ 4,600
ACM | Bridge loans
Agreements and transactions with related parties
Equity participation interest (as a percentage)																18.90%
ACM | Bridge loans | Single-Family Rental
Agreements and transactions with related parties
Loan committed														$ 35,000		$ 30,500
Loan committed upsized											$ 38,800			38,800
Investment made														9,000
ACM | Bridge loans | Matures in May 2023 | LIBOR
Agreements and transactions with related parties
Principal amount											13,600			13,600
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Maturity date of August 2022 | One multifamily property
Agreements and transactions with related parties
Principal amount																$ 35,400
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Maturity date of January 2019 | Multifamily Portfolio
Agreements and transactions with related parties
Number of properties owned | item																2
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Preferred equity investments | Maturity date of September 2019 | Multifamily Portfolio
Agreements and transactions with related parties
Equity investment																$ 3,400
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, one multifamily property
Agreements and transactions with related parties
Principal amount																	34,000
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, one multifamily property | Maturity date of August 2022
Agreements and transactions with related parties
Principal amount																$ 34,000
Variable rate, spread (as a percent)																3.50%
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, two multifamily properties | Maturity date of January 2019
Agreements and transactions with related parties
Principal amount																$ 14,800
Percentage of ownership interest of related party in the entity																50.00%
Consortium of investors including an immediate family member of our officers | Multifamily Portfolio | Fannie Mae Mortgage
Agreements and transactions with related parties
Principal amount																			$ 46,900
Interest income recorded														100
Percentage of ownership interest of related party in the entity																			17.60%
Percentage of maximum loss-sharing obligation unpaid principal balance																			5.00%
Consortium of investors including an immediate family member of our officers | Bridge loan, one multifamily property
Agreements and transactions with related parties
Principal amount																	$ 7,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loans | Maturity date of June 2021
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																		75.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loans | Maturity date of 2020
Agreements and transactions with related parties
Interest income recorded												500			1,400
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, several multifamily properties | Maturity date of January 2021
Agreements and transactions with related parties
Due to related party																		$ 9,400
Interest income recorded															300
Percentage of ownership interest of related party in the entity																		75.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, several multifamily properties | Maturity date of January 2021 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																		5.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, several multifamily properties | Maturity date of January 2022 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																		1.25%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property | Maturity date of June 2021
Agreements and transactions with related parties
Principal amount																		$ 21,700
Interest income recorded											400	300		1,000	1,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property | Maturity date of June 2021 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																		4.75%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property | Maturity date of August 2023 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																		0.25%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of October 2021
Agreements and transactions with related parties
Principal amount																			$ 31,100
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of October 2021 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																			4.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of 2020
Agreements and transactions with related parties
Principal amount																			$ 28,000
Base spread (as a percent)																			5.25%
Interest income recorded														800
Percentage of ownership interest of related party in the entity																			45.00%
Number of properties owned | property																			2
Number of bridge loans originated | item																			2
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of 2020 | Minimum
Agreements and transactions with related parties
LIBOR floor (as a percentage)																			1.24%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of 2020 | Maximum
Agreements and transactions with related parties
LIBOR floor (as a percentage)																			1.54%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of January 2019
Agreements and transactions with related parties
Interest income recorded											$ 100	100		$ 200	200
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of October 2022
Agreements and transactions with related parties
Base spread (as a percent)																			1.80%
Chairman and Chief executive officer | Minimum
Agreements and transactions with related parties
Ownership interest limit of our common stock under company charter (as a percent)											5.00%			5.00%
Mr. Ivan Kaufman
Agreements and transactions with related parties
Percentage of our former Manager's outstanding membership interest of related party in another related party											35.00%			35.00%
Director
Agreements and transactions with related parties
Number of portfolios of multifamily properties											2			2
Director | Ginkgo Investment Company LLC
Agreements and transactions with related parties
Percentage of managing member																			33.00%
Immediate family member of chief executive officer
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity					10.00%
Immediate family member of chief executive officer | Matures in October 2023 | Preferred equity interest financing agreement
Agreements and transactions with related parties
Interest income recorded											$ 300
Immediate family member of chief executive officer | Maturity date of March 2025
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity	10.00%
Immediate family member of chief executive officer | Preferred equity investments | Matures in October 2023
Agreements and transactions with related parties
Fixed rate of interest (as a percent)																12.00%
Immediate family member of chief executive officer | Preferred equity investments | Matures in April 2023
Agreements and transactions with related parties
Fixed rate of interest (as a percent)																12.00%
Immediate family member of chief executive officer | Bridge loans
Agreements and transactions with related parties
Equity participation interest (as a percentage)																21.80%
Immediate family member of chief executive officer | Bridge loans | Matures in October 2023
Agreements and transactions with related parties
Base spread (as a percent)																5.50%
Interest income recorded												100		$ 800	400
Immediate family member of chief executive officer | Bridge loans | Matures in October 2023 | LIBOR
Agreements and transactions with related parties
LIBOR floor (as a percentage)																0.75%
Immediate family member of chief executive officer | Bridge loans | Matures in May 2023 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																5.50%
LIBOR floor (as a percentage)																0.75%
Immediate family member of chief executive officer | Bridge loans | Matures in April 2023
Agreements and transactions with related parties
Interest income recorded											500	100		1,000	400
Lexford Portfolio | Bridge loans | Maturity date of June 2021
Agreements and transactions with related parties
Principal amount										$ 280,500
Number of bridge loans originated | loan										12
Number of multifamily properties renovated | property										72
Maximum exposure under guaranty											606,900			606,900
Entity controlled by our chief executive officer
Agreements and transactions with related parties
Reimbursement for flights chartered by the company's executives														1,000	100
Certain Officers and Managers | Mezzanine loans | Maturity date of January 2024
Agreements and transactions with related parties
Fixed rate of interest (as a percent)									10.00%
Certain Officers and Managers | Bridge loan, six multifamily properties | Maturity date of 2019
Agreements and transactions with related parties
Base spread (as a percent)																	4.50%
Interest income recorded														$ 100
Number of properties owned | property																				6
Proceeds from repayment in full																	$ 10,900		$ 6,800
Number of bridge loans paid off																	28,300	4	1
Remaining bridge loan from repayment																	$ 12,900
Certain Officers and Managers | Bridge loan, six multifamily properties | Maturity date of 2019 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																	0.25%
Certain Officers and Managers | 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%
Certain Officers and Managers | 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%
Certain Officers and Managers | Bridge loan, six multifamily properties | Maturity date of January 2019
Agreements and transactions with related parties
Principal amount																				$ 48,000
Ginkgo Investment Company LLC | Fannie Mae Mortgage
Agreements and transactions with related parties
Percentage of maximum loss-sharing obligation unpaid principal balance																			20.00%
Loan purchased a multifamily apartment complex which assumed																			$ 8,300
Percentage of ownership after transaction														3.60%
Percentage of loan assumption fee																			1.00%
Servicing revenue														$ 100
Consortium of affiliated investors | Lexford Portfolio
Agreements and transactions with related parties
Management fee, percentage of gross revenues of underlying properties														4.75%
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of March 2024
Agreements and transactions with related parties
Interest income recorded											1,000	$ 700		$ 2,500	$ 1,400
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of March 2024 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)													3.75%
LIBOR floor (as a percentage)													0.25%
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of March 2025
Agreements and transactions with related parties
Principal amount	$ 46,200			$ 39,400
Interest income recorded											100			100
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of March 2025 | LIBOR
Agreements and transactions with related parties
Equity participation interest (as a percentage)				2.25%
Base spread (as a percent)				4.00%
LIBOR floor (as a percentage)				0.25%
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of March 2025 | SOFR
Agreements and transactions with related parties
Equity participation interest (as a percentage)	70.00%
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of May 2025
Agreements and transactions with related parties
Principal amount		$ 67,100
Interest income recorded											$ 100			$ 100
Real estate investment fund sponsored and managed by Chief executive officer and immediate family member of chief executive officer | Bridge loans | Maturity date of May 2025 | SOFR
Agreements and transactions with related parties
Equity participation interest (as a percentage)		2.25%
Base spread (as a percent)		4.625%
LIBOR floor (as a percentage)		0.25%
LLC | LLC
Agreements and transactions with related parties
Amount invested					$ 4,200
Ownership interest (as a percent)					49.30%
Promissory note with AMC
Agreements and transactions with related parties
Outstanding principal balance of related party financing						$ 40,000