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

No definition available.

Name:	abr_BusinessCombinationConsiderationStockOperatingPartnerUnits
Namespace Prefix:	abr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_EquityMethodIndirectOwnershipPercentage
Namespace Prefix:	abr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_EquityMethodInvestmentNoncontrollingInterestAcquired
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum variable interest rate for loans receivable.

+ References

No definition available.

+ Details

Name:	abr_LoansReceivableFloorInterestRate
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_MaximumPercentageOfGuaranteeProvidedByCompanyInRelationToLegalSettlement
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

Name:	abr_MortgageLoansOnRealEstateAdditionalInvestmentByEntityAndIndependentOutsideInvestors
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of commitment to fund additional mortgage loans.

+ References

No definition available.

+ Details

Name:	abr_MortgageLoansOnRealEstateAdditionsCommitments
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_MortgageLoansOnRealEstateFixedInterestRate
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of multifamily properties renovated.

+ References

No definition available.

+ Details

Name:	abr_NumberOfMultifamilyPropertiesRenovated
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_NumberOfOneYearExtensionOptions
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_NumberOfPortfoliosOfMultifamilyProperties
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_NumberOfPreferredStockSharesPairedWithEachOperatingPartnershipUnit
Namespace Prefix:	abr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_OwnershipPercentageLimit
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represent information pertaining to percentage of loan assumption fee.

+ References

No definition available.

+ Details

Name:	abr_PercentageOfLoanAssumptionFee
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_PercentageOfMaximumLossSharingObligationOfUnpaidPrincipalBalance
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_PercentageOfOwnershipOfRelatedPartyInOtherRelatedParty
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyOwnership
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyOwnershipPercentage
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represent information pertaining to related party, percentage of management.

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyPercentageInManagement
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of mortgage loan secured by property purchased by the related party.

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionAmountOfMortgageLoanSecuredByPropertyPurchasedFromRelatedParty
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionNumberOfBridgeLoansOriginated
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of bridge loans paid off to the related party.

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionNumberOfBridgeLoansPaidOff
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionNumberOfMortgageLoansSecuredByPropertyPurchasedFromRelatedParty
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionPercentageOfOwnership
Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyTransactionSharesHeldByRelatedParty
Namespace Prefix:	abr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-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(Column F))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	srt_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount for accounts payable to related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_DueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

+ Details

Name:	us-gaap_EquityMethodInvestmentAggregateCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(f))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

+ Details

Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest expense incurred on a debt or other obligation to related party.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestExpenseRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestIncomeRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

+ Details

Name:	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

+ Details

Name:	us-gaap_LoansReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount for notes payable (written promise to pay), due to related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_NotesReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_NotesReceivableRelatedPartiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21D
-URI http://asc.fasb.org/extlink&oid=109223946&loc=SL94080555-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage charged for managing real estate properties.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyManagementFeePercentFee
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_UnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=abr_ResidentialMortgageBankingCompanyAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_PreferredEquityInvestmentsInMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_MezzanineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_ArborCommercialMortgageLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=abr_AgencyPlatformAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_NonQualifiedResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=abr_AcquisitionFinancingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateApril2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_SecondMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateApril2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_ConsortiumOfInvestorsIncludingImmediateFamilyMemberOfOurOfficersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_FannieMaeLoanOnMultifamilyPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_ConsortiumOfInvestorsIncludingOurChiefExecutiveOfficerAndOurFormerManagerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_CertainOfficersAndManagersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateSeptember2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_BridgeLoanSixMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfOctober2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_CertainOfficersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfJanuary2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_BridgeLoanSeveralMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfJune2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_BridgeLoanOneMultifamilyPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfJune2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfFourthQuarter2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_BridgeLoanTwoMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateJuly2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateJanuary2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateNovember2018ExtendedFromMay2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=abr_RealEstateMultiFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateNovember2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_ChairmanAndChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfAugust2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfAugust2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_MrIvanKaufmanAndHisAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_IvanKaufmanAndHisAffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_PresidentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_BridgeLoanSeveralUndevelopedParcelsOfLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_LexfordPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_GinkgoInvestmentCompanyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentAxis=abr_LexfordPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abr_ConsortiumOfAffiliatedInvestorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentAxis=abr_TwoPortfoliosOfMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=abr_GinkgoInvestmentCompanyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Agreements and Transactions with Related Parties, Other (Details) $ in Thousands	1 Months Ended										3 Months Ended			9 Months Ended		12 Months Ended				42 Months Ended
	Aug. 31, 2018 USD ($) shares	Jun. 30, 2018 USD ($) property loan item	May 31, 2018 USD ($) loan	Apr. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) property	Aug. 31, 2017 USD ($) loan	Jul. 31, 2017 USD ($)	May 31, 2017 USD ($)	Mar. 31, 2017 USD ($) item	Jan. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($) property item	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) property shares	Dec. 31, 2016 USD ($) property shares	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan item	Jun. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Mar. 31, 2016 USD ($)
Agreements and transactions with related parties
Due from related party					$ 688						$ 97,505	$ 688		$ 97,505		$ 688
Due to related party											538			538
Related party financing					50,000							50,000				50,000
Outstanding principal balance of related party financing					50,000							50,000				50,000
Income from equity affiliates											(1,028)		$ 996	1,104	$ 1,756
Investments in equity affiliates					23,653						22,101	23,653		22,101		23,653
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											2,300			2,300
Preferred equity investments
Agreements and transactions with related parties
Principal amount					5,000					$ 15,000		5,000				$ 5,000
Commitment to fund additional investment										$ 5,000
Interest income recorded													200		500
Fixed rate of interest (as a percent)										11.00%
Amount of ownership interest of related party in the entity										$ 5,000
Mezzanine loans
Agreements and transactions with related parties
Interest income recorded													100	100	300
Fixed rate of interest (as a percent)																		12.50%
Amount of loan to related party																		$ 3,000
ACM / Our "Former Manager"
Agreements and transactions with related parties
Related party financing																					$ 50,000
Interest expense on related party loan													1,000	300	2,900
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 from equity affiliates											$ 400		(1,200)	$ 1,200	(1,800)
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											5,349,053			5,349,053
OP units hold as part of acquisition \| shares	577,185													14,873,236		5,780,348	21,230,769
Percentage of voting power held by related party											21.00%			21.00%
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														$ 700						16,900
ACM / Our "Former Manager" \| Mortgage loans
Agreements and transactions with related parties
Amount of mortgage loan secured by property, purchased by related party																		$ 47,000
ACM / Our "Former Manager" \| Preferred equity interest financing agreement
Agreements and transactions with related parties
Related party financing					50,000							50,000				$ 50,000
Interest expense on related party loan													1,000	300	2,900
Outstanding principal balance of related party financing					50,000							50,000				50,000
ACM / Our "Former Manager" \| Maturity date of April 2016, extended to April 2018 \| Mortgage loans
Agreements and transactions with related parties
Base spread (as a percent)																			4.80%
Interest income recorded													200	200	700
Number of mortgage loans secured by property purchased from related party \| loan																			2
ACM / Our "Former Manager" \| Maturity date of April 2016, extended to April 2018 \| Mortgage loans \| First mortgage
Agreements and transactions with related parties
Amount of mortgage loan secured by property, purchased by related party																			$ 14,600
ACM / Our "Former Manager" \| Maturity date of April 2016, extended to April 2018 \| Mortgage loans \| Second mortgage
Agreements and transactions with related parties
Proceeds from repayment in full																	$ 5,100
Amount of mortgage loan secured by property, purchased by related party																			$ 5,100
ACM / Our "Former Manager" \| Maturity date April 2018, extended from April 2016 \| Mortgage loans \| First mortgage
Agreements and transactions with related parties
Amount of mortgage loan secured by property, purchased by related party																						$ 14,600
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%
Principal amount								$ 46,900
Percentage of ownership interest of related party in the entity								21.40%
Interest income recorded														100
Consortium of investors including an immediate family member of our officers \| Fannie Mae loan on a multifamily property \| Maximum
Agreements and transactions with related parties
Servicing revenue											$ 100
Interest income recorded													100		100
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%
Number of portfolios of multifamily properties \| item									2
Certain officers, including our Chief Executive Officer and our Former Manager \| Maturity date of September 2019 \| Bridge loan, six multifamily properties
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		700	1,600	2,100
Number of bridge loans paid off \| loan			3			1
Proceeds from repayment in full			$ 23,200			$ 6,800
Certain officers, including our Chief Executive Officer and our Former Manager \| Maturity date of September 2019 \| Bridge loan, six multifamily properties \| 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 \| Maturity date of September 2019 \| Bridge loan, six multifamily properties \| 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 \| Maturity Date of October 2018 \| Bridge loans
Agreements and transactions with related parties
Base spread (as a percent)																		5.00%
LIBOR floor (as a percentage)																		0.25%
Interest income recorded											300		300	1,000	800
Number of mortgage loans secured by property purchased from related party \| loan																		2
Loan due from related party																		$ 16,700
Number of bridge loans paid off \| loan																		1
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity Date of January 2021 \| Bridge loan, several multifamily properties
Agreements and transactions with related parties
Due to related party				$ 9,400
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											100			200
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity Date of June 2021 \| Bridge loan, one multifamily property
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											300			400
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity Date of June 2021 \| Bridge loan, one multifamily property \| 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 \| Maturity date of June 2020 \| Bridge loan, several multifamily properties
Agreements and transactions with related parties
Due to related party					$ 32,800							$ 32,800				$ 32,800
Percentage of ownership after transaction					90.00%
Base spread (as a percent)					5.00%							5.00%				5.00%
LIBOR floor (as a percentage)					1.13%
Interest income recorded											600			1,700
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of fourth quarter 2020 \| Bridge loan, two multifamily properties
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											500			1,600
Number of bridge loans originated \| item												2
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of fourth quarter 2020 \| Bridge loan, two multifamily properties \| Minimum
Agreements and transactions with related parties
LIBOR floor (as a percentage)												1.24%
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of fourth quarter 2020 \| Bridge loan, two multifamily properties \| Maximum
Agreements and transactions with related parties
LIBOR floor (as a percentage)												1.54%
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of July 2020 \| Bridge loan, one multifamily property
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											700		400	1,900	400
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of January 2019 \| Bridge loan, two multifamily properties
Agreements and transactions with related parties
Principal amount																	$ 12,700
Number of properties owned \| property																	2
Percentage of ownership interest of related party in the entity																	50.00%
Base spread (as a percent)																	4.50%
LIBOR floor (as a percentage)																	0.25%
Interest income recorded											$ 400		300	1,000	900
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of January 2019 \| Bridge loan, one multifamily property
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	$ 300	800
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date November 2018, extended from May 2018 \| Preferred equity investments \| Multifamily
Agreements and transactions with related parties
Equity investment																	$ 5,200
Fixed rate of interest (as a percent)																	10.00%
Certain certain officers, chief executive officer, and other unaffiliated investors \| Maturity date of November 2018 \| Bridge loans
Agreements and transactions with related parties
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													100		300
Amount of loan to related party																		$ 7,100
Chief executive officer \| Minimum
Agreements and transactions with related parties
Ownership interest allowed under company charter (as a percent)											5.00%			5.00%
Chief executive officer \| Bridge loan, two multifamily properties
Agreements and transactions with related parties
Number of properties owned \| item																			2
Percentage of ownership interest of related party in the entity																			95.00%
Base spread (as a percent)																			5.50%
Amount of loan to related party																			$ 1,700
Investments in equity affiliates																			$ 100
Ownership interest (as a percent)																			5.00%
Chief executive officer \| Bridge loan, two multifamily properties \| Maximum
Agreements and transactions with related parties
Interest income recorded													100		100
Chief executive officer \| Maturity date of August 2017 \| Bridge loans
Agreements and transactions with related parties
Percentage of ownership interest of related party in the entity																			24.00%
Amount of mortgage loan secured by property, purchased by related party																			$ 30,400
Chief executive officer \| Maturity date of August 2020 \| Bridge loans
Agreements and transactions with related parties
Base spread (as a percent)						4.00%
LIBOR floor (as a percentage)						1.23%
Amount of mortgage loan secured by property, purchased by related party						$ 43,200
Mr. Ivan Kaufman and his affiliates \| Maturity date of August 2017 \| Mezzanine loans
Agreements and transactions with related parties
Interest income recorded													800
Fixed rate of interest (as a percent)																	12.00%
Amount of mortgage loan secured by property, purchased by related party																	$ 4,600
Kaufman Entities
Agreements and transactions with related parties
Percentage of our Former Manager's outstanding membership interest of related party in another related party											75.00%			75.00%
Mr. Ivan Kaufman \| Maturity date of August 2017 \| Mezzanine loans
Agreements and transactions with related parties
Interest income recorded															2,400
Immediate family member of chief executive officer \| Bridge Loan, several undeveloped parcels of land
Agreements and transactions with related parties
Principal amount	$ 17,700
Percentage of ownership interest of related party in the entity	10.80%
Interest income recorded											$ 300			$ 300
Fixed rate of interest (as a percent)	10.00%
Lexford Portfolio \| Preferred equity investments
Agreements and transactions with related parties
Income from equity affiliates											700		700	1,900	2,000
Lexford Portfolio \| Maturity Date of June 2021 \| Bridge loans
Agreements and transactions with related parties
Principal amount		$ 280,500																		$ 280,500
Interest income recorded											4,400			5,500
Maximum exposure under guaranty											307,900			$ 307,900
Number of bridge loans originated \| loan		12
Number of multifamily properties renovated \| property		72
Number of one-year extension options \| item		2
Lexford Portfolio \| Maturity Date of June 2021 \| Bridge loans \| LIBOR
Agreements and transactions with related parties
Base spread (as a percent)		4.00%																		4.00%
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%
Percentage of loan assumption fee										1.00%
Percentage of ownership after transaction														3.60%
Ginkgo \| Maximum \| Fannie Mae
Agreements and transactions with related parties
Servicing revenue											100		100	$ 100	100
Lexford Portfolio \| Maturity Date of June 2021 \| Bridge loans
Agreements and transactions with related parties
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners											$ 50,000			$ 50,000
Lexford Portfolio \| Consortium of affiliated investors
Agreements and transactions with related parties
Management fee, percentage of gross revenues of underlying properties														4.75%
Two portfolios of multifamily properties \| Consortium of Investors, including our Chief Executive Officer and our Former Manager \| Maturity date of November 2018 \| Bridge loans
Agreements and transactions with related parties
Principal amount									$ 14,800
Base spread (as a percent)									5.25%
LIBOR floor (as a percentage)									0.50%
Interest income recorded													$ 300	$ 300	$ 800
Number of bridge loans originated \| item									2
Ginkgo \| Director
Agreements and transactions with related parties
Percentage of managing member										33.00%