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Agreements and Transactions with Related Parties - Other Related Party (Details)	1 Months Ended										12 Months Ended							24 Months Ended
	Dec. 31, 2021 USD ($) shares	Oct. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jan. 31, 2021	Dec. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) property loan	Dec. 31, 2017 USD ($) loan property	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	Dec. 31, 2021 USD ($) shares	Jul. 31, 2019 USD ($)
Agreements and transactions with related parties
Due to related party	$ 26,570,000				$ 2,365,000						$ 26,570,000	$ 2,365,000						$ 26,570,000
Due from related parties	84,318,000				12,449,000						84,318,000	12,449,000						84,318,000
Related party financing	0										0							0
Interest expense on related party loan											200,000
Outstanding principal balance of related party financing	0										0							0
Proceeds from Bridge loan on a multi family property		$ 67,000,000.0
Entitled to annual fee	$ 1,300,000				1,600,000						1,300,000	1,600,000						$ 1,300,000
Paydowns of principal made by borrower											2,516,771,000	1,243,694,000	$ 1,753,693,000
Base spread (as a percent)		3.00%
Investment made											$ 9,209,475,000	2,376,233,000	2,712,354,000
Proceeds from repayment in full										$ 10,900,000
Indirect ownership percentage											9.20%
(Income) loss from equity affiliates											$ (34,567,000)	(76,161,000)	(10,635,000)
Percentage of our Former Manager's outstanding membership interest of related party in another related party	35.00%										35.00%							35.00%
Other Related Party Transactions
Agreements and transactions with related parties
Due from related parties	$ 84,300,000				12,400,000						$ 84,300,000	12,400,000						$ 84,300,000
CMBS/Conduit
Agreements and transactions with related parties
Loans assumed	$ 26,000,000.0
Chairman and Chief executive officer
Agreements and transactions with related parties
Reimbursement for flights chartered by the company's executives											$ 200,000
Ownership interest limit of our common stock under company charter (as a percent)	5.00%										5.00%							5.00%
ACM Acquisition
Agreements and transactions with related parties
Distribution received											$ 28,000,000.0	43,200,000
Retail property
Agreements and transactions with related parties
Property purchased	$ 32,500,000										32,500,000							$ 32,500,000
Maturity date of March 2030 | Private Label | Lexford Portfolio
Agreements and transactions with related parties
Principal amount								$ 34,600,000
Fixed rate of interest (as a percent)								3.30%
Preferred equity investments
Agreements and transactions with related parties
Equity investment	8,200,000										8,200,000							8,200,000
Preferred equity investments | Single-Family Rental
Agreements and transactions with related parties
Investment made						$ 4,600,000
Bridge Loans
Agreements and transactions with related parties
Principal amount	35,000,000.0										35,000,000.0							35,000,000.0
Fixed rate of interest (as a percent)																10.00%
Bridge Loans | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																4.50%
LIBOR floor (as a percentage)																0.25%
Bridge Loans | Single-Family Rental
Agreements and transactions with related parties
Loan committed					32,500,000	$ 30,500,000					3,200,000
Investment made					$ 3,500,000
Bridge Loan Several Multifamily Properties [Member]
Agreements and transactions with related parties
Principal amount														$ 37,500,000
Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of January 2021 [Member] | Chairman and Chief executive officer
Agreements and transactions with related parties
Interest income recorded												600,000	600,000
Bridge Loan Six Multifamily Properties [Member]
Agreements and transactions with related parties
UPB converted to a mezzanine loan										2,000,000.0
Bridge Loan Six Multifamily Properties [Member] | Maturity Date September 2019 [Member]
Agreements and transactions with related parties
Principal amount										12,900,000
AMAC III
Agreements and transactions with related parties
Interest income recorded											1,300,000	1,900,000	3,300,000
(Income) loss from equity affiliates											1,300,000	900,000
Distribution received											3,800,000	100,000
Lexford Portfolio
Agreements and transactions with related parties
Distribution received											$ 1,100,000	3,500,000
Lexford Portfolio | Bridge Loans | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Paydowns of principal made by borrower										$ 250,000,000.0
Base spread (as a percent)														4.00%
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners														$ 50,000,000.0
Two portfolios of multifamily properties
Agreements and transactions with related parties
Percentage of loan assumption fee																50.00%
Principal amount																$ 12,700,000
Equity investment																5,200,000
Ginkgo Investment Company LLC [Member] | Fannie Mae Mortgage
Agreements and transactions with related parties
Loan purchased a multifamily apartment complex which assumed															$ 8,300,000
Percentage of maximum loss-sharing obligation unpaid principal balance															20.00%
Servicing revenue															$ 100,000
Percentage of loan assumption fee															1.00%
Percentage of ownership after transaction											3.60%
ACM, Certain executives and Consortium of independent outside investors | Mature date of April 2030 | Private Label
Agreements and transactions with related parties
Fixed rate of interest (as a percent)								3.10%
ACM, Certain executives and Consortium of independent outside investors | Mature date of April 2030 | Mezzanine Loans
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
Amount invested	$ 20,300,000										$ 20,300,000		$ 30,000,000.0					$ 20,300,000
Ownership interest (as a percent)													18.00%
ACM, Certain executives and Consortium of independent outside investors | AMAC III | Private Label
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													$ 15,600,000
ACM, Certain executives and Consortium of independent outside investors | AMAC III | Bridge Loans
Agreements and transactions with related parties
Amount of loan to related party																			$ 34,000,000.0
Unaffiliated borrower | AMAC III | Mezzanine Loans
Agreements and transactions with related parties
Amount of loan to related party																			$ 7,000,000.0
ACM
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																	50.00%
ACM | Residential Mortgage Banking Company
Agreements and transactions with related parties
Noncontrolling interest in equity method investment acquired (as a percent)																	50.00%
Indirect ownership percentage				12.30%													22.50%
Acquisition purchase price																	$ 9,600,000
(Income) loss from equity affiliates											$ 34,600,000		7,200,000
Distribution received												$ 75,700,000
ACM | ACM Acquisition
Agreements and transactions with related parties
Number of shares held by related party | shares	2,535,870										2,535,870							2,535,870
OP units hold as part of acquisition | shares												10,665,530
Aggregate percentage of voting power held by related party	8.00%										8.00%							8.00%
ACM | Preferred equity interest financing agreement
Agreements and transactions with related parties
Interest income recorded												$ 100,000	1,800,000
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Maturity Date January 2019 [Member] | Multifamily Portfolio
Agreements and transactions with related parties
Number of properties owned | property								2
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Preferred equity investments | Multifamily Portfolio
Agreements and transactions with related parties
Equity investment								$ 3,400,000
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge Loan One Multifamily Property [Member]
Agreements and transactions with related parties
Principal amount														$ 61,200,000
Percentage of ownership interest of related party in the entity														10.00%
Interest income recorded													1,300,000
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge Loan One Multifamily Property [Member] | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)														4.50%
LIBOR floor (as a percentage)														2.00%
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge Loan One Multifamily Property [Member] | Maturity Date Of August 2022 [Member]
Agreements and transactions with related parties
Principal amount	$ 34,000,000.0						$ 35,400,000				$ 34,000,000.0							$ 34,000,000.0
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge Loan One Multifamily Property [Member] | Maturity Date Of August 2022 [Member] | LIBOR
Agreements and transactions with related parties
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 [Member] | Maturity Date January 2019 [Member]
Agreements and transactions with related parties
Principal amount								$ 14,800,000
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
Percentage of maximum loss-sharing obligation unpaid principal balance															5.00%
Servicing revenue															$ 100,000
Principal amount															$ 46,900,000
Percentage of ownership interest of related party in the entity															17.60%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Principal amount														$ 21,700,000
Percentage of ownership interest of related party in the entity														75.00%
Base spread (as a percent)														4.75%
LIBOR floor (as a percentage)														1.25%
Interest income recorded											1,300,000	1,400,000	1,400,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of January 2021 [Member]
Agreements and transactions with related parties
Due to related party														$ 9,400,000
Percentage of ownership interest of related party in the entity														75.00%
Base spread (as a percent)														5.00%
LIBOR floor (as a percentage)														1.25%
Interest income recorded																		$ 400,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of June 2020 [Member]
Agreements and transactions with related parties
Due to related party															$ 32,800,000
Percentage of ownership interest of related party in the entity															90.00%
Base spread (as a percent)															5.00%
LIBOR floor (as a percentage)															1.13%
Interest income recorded													1,700,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of July 2021 [Member]
Agreements and transactions with related parties
Due to related party														$ 19,500,000
Percentage of ownership interest of related party in the entity														85.00%
Interest income recorded											100,000	1,300,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Several Multifamily Properties [Member] | Maturity Date Of July 2021 [Member] | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)														4.00%
LIBOR floor (as a percentage)														2.125%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan One Multifamily Property [Member] | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Interest income recorded												1,400,000	2,700,000
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Two Multifamily Properties [Member] | Maturity date of October 2021
Agreements and transactions with related parties
Principal amount															$ 31,100,000
LIBOR floor (as a percentage)															1.80%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Two Multifamily Properties [Member] | 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 [Member] | Maturity Date Of Fourth Quarter 2020 [Member]
Agreements and transactions with related parties
Principal amount															$ 28,000,000.0
Number of properties owned | property															2
Percentage of ownership interest of related party in the entity															45.00%
Base spread (as a percent)															5.25%
Interest income recorded											1,900,000	1,900,000	2,200,000
Number of mortgage loans secured by property purchased from related party | loan															2
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge Loan Two Multifamily Properties [Member] | Maturity Date Of Fourth Quarter 2020 [Member] | 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 [Member] | Maturity Date Of Fourth Quarter 2020 [Member] | 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 [Member] | Maturity Date January 2019 [Member]
Agreements and transactions with related parties
Interest income recorded											$ 300,000	300,000	$ 600,000
Chairman and Chief executive officer
Agreements and transactions with related parties
Reimbursement for flights chartered by the company's executives												$ 500,000
Director | Ginkgo Investment Company LLC [Member]
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
Ownership interest (as a percent)	10.00%										10.00%							10.00%
Immediate family member of chief executive officer | Matures in October 2023 [Member] | Preferred equity interest financing agreement
Agreements and transactions with related parties
Interest income recorded											$ 500,000
Immediate family member of chief executive officer | Preferred equity investments | Matures in October 2023 [Member]
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 [Member]
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%	18.90%						21.80%
Immediate family member of chief executive officer | Bridge Loans | Land
Agreements and transactions with related parties
Principal amount														$ 17,700,000
Paydowns of principal made by borrower									$ 4,700,000
Percentage of ownership interest of related party in the entity														10.80%
Fixed rate of interest (as a percent)														10.00%
Immediate family member of chief executive officer | Bridge Loans | Matures in October 2023 [Member]
Agreements and transactions with related parties
Interest income recorded												$ 100,000
Immediate family member of chief executive officer | Bridge Loans | Matures in October 2023 [Member] | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)					5.50%							5.50%
LIBOR floor (as a percentage)					0.75%
Immediate family member of chief executive officer | Bridge Loans | Matures in May 2023 [Member] | LIBOR
Agreements and transactions with related parties
Amount invested	$ 3,500,000										3,500,000							$ 3,500,000
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 [Member]
Agreements and transactions with related parties
Interest income recorded												$ 100,000
Immediate family member of chief executive officer | Bridge Loans | Mature date of April 2030
Agreements and transactions with related parties
Interest income recorded											600,000
Immediate family member of chief executive officer | Bridge Loan Several Multifamily Properties [Member]
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity													23.90%
LIBOR floor (as a percentage)													2.375%
Immediate family member of chief executive officer | Bridge Loan Several Multifamily Properties [Member] | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)													4.25%
Lexford Portfolio
Agreements and transactions with related parties
(Income) loss from equity affiliates												(1,100,000)	$ (3,500,000)
Maximum exposure under guaranty	612,900,000										612,900,000							612,900,000
Lexford Portfolio | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Interest income recorded												500,000	9,600,000
Lexford Portfolio | Bridge Loans | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Number of bridge loans originated | loan														12
Number of multifamily properties renovated | property														72
Lexford Portfolio | Bridge Loan Two Multifamily Properties [Member] | Maturity Date Of June 2021 [Member]
Agreements and transactions with related parties
Base spread (as a percent)														280.50%
Entity controlled by our chief executive officer
Agreements and transactions with related parties
Reimbursement for flights chartered by the company's executives													100,000
Certain Officers And Managers [Member] | Mezzanine Loans
Agreements and transactions with related parties
Fixed rate of interest (as a percent)										10.00%
Certain Officers And Managers [Member] | Bridge Loan Six Multifamily Properties [Member] | Maturity Date September 2019 [Member]
Agreements and transactions with related parties
Principal amount																$ 48,000,000.0
Number of properties owned | property																6
Base spread (as a percent)																4.50%
LIBOR floor (as a percentage)																0.25%
Interest income recorded											$ 200,000	$ 200,000	$ 300,000
Proceeds from repayment of debt														$ 28,300,000
Proceeds from repayment in full															$ 6,800,000
Certain Officers And Managers [Member] | Bridge Loan Six Multifamily Properties [Member] | Maturity Date September 2019 [Member] | Minimum
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																10.50%
Certain Officers And Managers [Member] | Bridge Loan Six Multifamily Properties [Member] | Maturity Date September 2019 [Member] | Maximum
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																12.00%
Consortium Of Affiliated Investors [Member] | 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
Loan committed			$ 63,400,000
Interest income recorded											$ 2,100,000
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%
LLC
Agreements and transactions with related parties
Amount invested	$ 4,200,000										$ 4,200,000							$ 4,200,000
Ownership interest (as a percent)	49.30%										49.30%							49.30%
Promissory note with AMC
Agreements and transactions with related parties
Related party financing		$ 40,000,000.0
Outstanding principal balance of related party financing		$ 40,000,000.0

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- Definition

Numbers of operating partnership units issued or issuable in consideration for the business combination.

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The amount of mortgage loans converted to mezzanine loans during the reporting period.

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Minimum variable interest rate for loans receivable.

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The number of multifamily properties renovated.

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Amount of Payments To Purchase Property.

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No definition available.

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
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