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Agreements and Transactions with Related Parties, Other Related Party (Details) $ in Thousands		1 Months Ended																3 Months Ended									12 Months Ended					60 Months Ended
	Nov. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) property item loan	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) property	Aug. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	May 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Nov. 30, 2016 USD ($) item	Sep. 30, 2016 USD ($) property	Jan. 31, 2016 USD ($) property	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) property loan	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) property	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2019 USD ($) shares	Jul. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Mar. 31, 2017 USD ($) item
Agreements and transactions with related parties
Due to related party		$ 13,100																$ 13,100									$ 13,100					$ 13,100
Due from Related Parties		$ 10,651																10,651				$ 1,287					10,651	$ 1,287				$ 10,651
Paydowns of principal made by borrower																											1,753,693	957,163	$ 929,796
Proceeds from repayment in full				$ 10,900
Income (loss) from equity affiliates																		$ 1,502	$ 3,718	$ 3,264	$ 2,151	$ 91	$ (1,028)	$ 1,387	$ 746		$ 10,635	1,196	(2,951)
Chief executive officer
Agreements and transactions with related parties
Ownership interest limit of our common stock under company charter (as a percent)		5.00%																5.00%									5.00%					5.00%
Residential Mortgage Banking Company
Agreements and transactions with related parties
Maximum percentage of guaranty provided by the Company in relation to the settlement																															50.00%
Maximum exposure under guaranty		$ 400																$ 400									$ 400					$ 400
Preferred equity investments
Agreements and transactions with related parties
Principal amount														$ 15,000																$ 5,000
Commitment to fund additional investment														$ 5,000
Interest income recorded																													1,100
Fixed rate of interest (as a percent)														11.00%
Bridge loans | Maturity date of November 2018
Agreements and transactions with related parties
Principal amount															$ 14,800
Base spread (as a percent)															5.25%
LIBOR floor (as a percentage)															0.50%
Bridge loan, several multifamily properties
Agreements and transactions with related parties
Principal amount					$ 37,500
Percentage of ownership interest of related party in the entity					85.00%
Bridge loan, six multifamily properties
Agreements and transactions with related parties
UPB converted to a mezzanine loan				$ 2,000
Bridge loan, six multifamily properties | Maturity date of September 2019
Agreements and transactions with related parties
Principal amount																														$ 12,900
AMAC III
Agreements and transactions with related parties
Income (loss) from equity affiliates																											200
Investment in real estate committed																					$ 30,000
Lexford Portfolio | Bridge loans | Maturity Date of June 2021
Agreements and transactions with related parties
Paydowns of principal made by borrower																											$ 250,000
Base spread (as a percent)							4.00%																	4.00%
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners							$ 50,000																	$ 50,000
Ginkgo | Fannie Mae
Agreements and transactions with related parties
Loan purchased a multifamily apartment complex which assumed														$ 8,300
Percentage of maximum loss-sharing obligation unpaid principal balance														20.00%
Servicing revenue														$ 100
Percentage of loan assumption fee														1.00%
Percentage of ownership after transaction																											3.60%
Affiliated entities | Loans originated in 2015 or prior years
Agreements and transactions with related parties
Interest income recorded																												1,300	5,800
ACM, Certain executives and Consortium of independent outside investors | AMAC III
Agreements and transactions with related parties
Amount invested		$ 10,900																10,900									$ 10,900					10,900
Ownership interest (as a percent)																					18.00%
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
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%
Interest income recorded		$ 3,300
Fixed rate of interest (as a percent)		3.735%
Amount of loan to related party		$ 15,600																$ 15,600									15,600					$ 15,600
Unaffiliated borrower | AMAC III | Mezzanine loans
Agreements and transactions with related parties
Amount of loan to related party																																	$ 7,000
ACM / Our "Former Manager"
Agreements and transactions with related parties
Related party financing																																		$ 50,000
Outstanding principal balance of related party financing																																		$ 50,000
ACM / Our "Former Manager" | 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																															22.5%
Acquisition purchase price																															$ 9,600
Income (loss) from equity affiliates																											$ 7,200	(900)	(7,200)
Maximum percentage of guaranty provided by the Company in relation to the settlement																															50.00%
ACM / Our "Former Manager" | ACM Acquisition
Agreements and transactions with related parties
Number of preferred stock shares paired with each OP units | shares																														1
Number of shares held by related party | shares		4,285,694																4,285,694									4,285,694					4,285,694
OP units hold as part of acquisition | shares																											14,685,729
Percentage of voting power held by related party		14.60%																14.60%									14.60%					14.60%
ACM / Our "Former Manager" | Preferred equity interest financing agreement
Agreements and transactions with related parties
Interest expense on related party loan																												300	3,800
ACM / Our "Former Manager" | Non-qualified Residential Mortgages | Residential Mortgage Banking Company
Agreements and transactions with related parties
Additional investment made by the company along with a consortium of independent outside investors																																$ 16,100
Proceeds from sale of available-for-sale securities																																16,900
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Fannie Mae
Agreements and transactions with related parties
Servicing revenue													$ 100
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Maturity date of January 2019 | Multifamily
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
Agreements and transactions with related parties
Equity investment																	$ 5,200
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Preferred equity investments | Maturity Date May 2018 extended from November 2017
Agreements and transactions with related parties
Fixed rate of interest (as a percent)																	10.00%
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, several multifamily properties
Agreements and transactions with related parties
Principal amount					$ 19,500
Interest income recorded																											$ 1,300	300
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, several multifamily properties | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)					4.00%
LIBOR floor (as a percentage)					2.125%
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																	$ 12,700
Percentage of ownership interest of related party in the entity																	50.00%
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, two multifamily properties | Maturity date of January 2019 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)																	4.50%
LIBOR floor (as a percentage)																	0.25%
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	$ 61,200
Percentage of ownership interest of related party in the entity	10.00%
Interest income recorded																											1,300
Consortium of investors including other unaffiliated investors, certain of officers and chief executive officer | Bridge loan, one multifamily property | 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 an immediate family member of our officers | Fannie Mae loan on a multifamily property
Agreements and transactions with related parties
Percentage of maximum loss-sharing obligation unpaid principal balance													5.00%
Servicing revenue																												100
Principal amount													$ 46,900
Percentage of ownership interest of related party in the entity													17.60%
Consortium of Investors, including our Chief Executive Officer and our Former Manager
Agreements and transactions with related parties
Amount invested																																			$ 2,000
Ownership interest (as a percent)																																			26.10%
Interest income recorded																											300
Number of portfolios of multifamily properties | item																																			2
Consortium of Investors, including our Chief Executive Officer and our Former Manager | Bridge loans | Maturity date of November 2018
Agreements and transactions with related parties
Number of bridge loans originated | item															2
Certain officers, including our Chief Executive Officer and our Former Manager | Bridge loan, six multifamily properties | Maturity date of September 2019
Agreements and transactions with related parties
Principal amount																$ 48,000
Number of properties owned | property																6
Base spread (as a percent)																4.50%
LIBOR floor (as a percentage)																0.25%
Interest income recorded																											300	1,900	2,700
Proceeds from repayment of debt								$ 28,300
Proceeds from repayment in full											$ 6,800
Certain officers, including our Chief Executive Officer and our Former Manager | Bridge loan, six multifamily properties | Maturity date of September 2019 | Minimum
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																10.50%
Certain officers, including our Chief Executive Officer and our Former Manager | Bridge loan, six multifamily properties | Maturity date of September 2019 | Maximum
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																12.00%
Certain officers, including our Chief Executive Officer and our Former Manager | Mezzanine loans | Maturity date of January 2024
Agreements and transactions with related parties
Fixed rate of interest (as a percent)				10.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Preferred equity investments
Agreements and transactions with related parties
Amount of ownership interest of related party in the entity												$ 5,000
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
Principal amount		$ 8,600																$ 8,600									8,600					8,600
Percentage of ownership interest of related party in the entity									75.00%
Interest income recorded																											600	300
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%
LIBOR floor (as a percentage)									1.25%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, several multifamily properties | Maturity date of June 2020
Agreements and transactions with related parties
Principal amount										$ 32,800																$ 32,800			$ 32,800
Percentage of ownership interest of related party in the entity										90.00%
Base spread (as a percent)										5.00%																5.00%			5.00%
LIBOR floor (as a percentage)										1.13%
Interest income recorded																											1,700	2,400	$ 100
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, two multifamily properties | Maturity date of fourth quarter 2020
Agreements and transactions with related parties
Principal amount										$ 28,000																$ 28,000			$ 28,000
Number of properties owned | property										2																2			2
Percentage of ownership interest of related party in the entity																										45.00%
Base spread (as a percent)										5.25%																5.25%			5.25%
Interest income recorded																											2,200	2,100	$ 200
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 | Maturity date of fourth quarter 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 fourth quarter 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																											600	1,400	1,300
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																$ 31,100			$ 31,100
LIBOR floor (as a percentage)																										1.80%
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%																4.00%			4.00%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property
Agreements and transactions with related parties
Principal amount		$ 22,600																22,600									22,600					$ 22,600
Proceeds from Bridge loan on a multi family property																		$ 17,400
Interest income recorded																												200
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																	$ 21,700
Percentage of ownership interest of related party in the entity							75.00%
Interest income recorded																											1,400	600
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%																	4.75%
LIBOR floor (as a percentage)							1.25%
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property | Maturity date of July 2020
Agreements and transactions with related parties
Principal amount												$ 36,000
Percentage of ownership interest of related party in the entity												95.00%
Base spread (as a percent)												4.50%
LIBOR floor (as a percentage)												1.00%
Interest income recorded																											1,900	900
Certain certain officers, chief executive officer, and other unaffiliated investors | Bridge loan, one multifamily property | Maturity date of January 2019
Agreements and transactions with related parties
Principal amount																														$ 19,000
Percentage of ownership interest of related party in the entity																														7.50%
Base spread (as a percent)																														4.50%
LIBOR floor (as a percentage)																														0.25%
Interest income recorded																											$ 300	1,100
Kaufman Entities
Agreements and transactions with related parties
Percentage of our Former Manager's outstanding membership interest of related party in another related party		31.00%																31.00%									31.00%					31.00%
Director | Ginkgo
Agreements and transactions with related parties
Percentage of managing member														33.00%
Consortium of affiliated investors
Agreements and transactions with related parties
Interest income recorded																												1,000
Consortium of affiliated investors | Bridge loans | Maturity Date of June 2021
Agreements and transactions with related parties
Number of one-year extension options | item							2
Consortium of affiliated investors | Fannie Mae loan on a multifamily property
Agreements and transactions with related parties
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%
Immediate family member of chief executive officer | Bridge Loan, several undeveloped parcels of land
Agreements and transactions with related parties
Principal amount						$ 17,700
Paydowns of principal made by borrower			$ 4,700
Percentage of ownership interest of related party in the entity						10.80%
Interest income recorded																											$ 1,800	800
Fixed rate of interest (as a percent)						10.00%
Immediate family member of chief executive officer | Bridge loan, several multifamily properties
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 | LIBOR
Agreements and transactions with related parties
Base spread (as a percent)				4.25%
Interest income recorded																											2,700
Lexford Portfolio
Agreements and transactions with related parties
Income (loss) from equity affiliates																											3,500	2,500	$ 2,500
Maximum exposure under guaranty		$ 617,900																$ 617,900									617,900					$ 617,900
Lexford Portfolio | Maturity Date of June 2021
Agreements and transactions with related parties
Interest income recorded																											9,600	$ 10,100
Lexford Portfolio | Bridge loans | Maturity Date of June 2021
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 | Maturity Date of June 2021
Agreements and transactions with related parties
Base spread (as a percent)							280.50%																	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

X

- Definition

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

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No definition available.

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- Definition

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

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- Definition

Represents information pertaining to the percentage of indirect ownership in a business.

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No definition available.

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- Definition

Represents the percentage of noncontrolling interest in the equity method investment acquired by the entity.

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No definition available.

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- Definition

Minimum variable interest rate for loans receivable.

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No definition available.

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- Definition

Amount of percentage of guarantee provided by the company in relation to Legal Settlement.

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No definition available.

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- Definition

The amount of additional investment made by the company, along with a consortium of independent outside investors, in the mortgage loans on real estate during the reporting period.

+ References

No definition available.

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- Definition

Amount of commitment to fund additional mortgage loans.

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No definition available.

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- Definition

Represents the fixed interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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No definition available.

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- Definition

The number of multifamily properties renovated.

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No definition available.

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- Definition

Represents the number of one-year extension options available under the loans.

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No definition available.

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The number of portfolios of multifamily properties as of the balance sheet date.

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No definition available.

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- Definition

Represents number of preferred stock shares paired with each operating partnership unit.

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No definition available.

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- Definition

Represents the maximum percentage of ownership interest of the Company's common stock allowed under the company's charter.

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No definition available.

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- Definition

Represent information pertaining to percentage of loan assumption fee.

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No definition available.

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- Definition

Represents information pertaining to percentage of maximum loss-sharing obligation unpaid principal balance.

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No definition available.

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Represents the percentage of outstanding membership interest of a related party in another related party.

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No definition available.

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- Definition

The amount the entity agreed to invest in real estate joint ventures including direct and indirect investments.

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No definition available.

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- Definition

Represents the ownership amount owned by related party in the entity.

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No definition available.

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- Definition

Represents the percentage of ownership of common stock or equity participation owned by related party.

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No definition available.

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Represent information pertaining to related party, percentage of management.

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No definition available.

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- Definition

Represents the number of bridge loan originated with relevant mortgage property owned by related parties.

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No definition available.

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- Definition

Represents the number of mortgage loans secured by property purchased from the related party.

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No definition available.

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- Definition

Represents the percentage of voting power held by a related party.

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No definition available.

+ Details

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- Definition

The amount of reimbursements made to related party during the period for flights chartered by the company's executives.

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No definition available.

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- Definition

Represents the number of common shares held by a related party.

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No definition available.

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- Definition

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)
-Number 210
-Section 12
-Footnote 6
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Amount of contractual principal due at origination of mortgage loan within 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.

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

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