XML 92 R83.htm IDEA: XBRL DOCUMENT v3.23.2

Agreements and Transactions with Related Parties - Other Related Party (Details) $ in Thousands		1 Months Ended						3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2023	May 30, 2023 USD ($)	Apr. 30, 2023 USD ($)	Jul. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jan. 31, 2019 USD ($)	Jun. 30, 2023 USD ($) entity shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) entity shares	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) loan property	Dec. 31, 2017 USD ($) loan property	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	May 31, 2023 USD ($) officer	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Agreements and Transactions with Related Parties
Interest income								$ 335,737	$ 201,328	$ 663,685	$ 368,026
Investment made										867,804	4,661,893
Loans and investments, allowance for credit losses								169,054	121,331	169,054	121,331	$ 113,241								$ 153,077	$ 132,559	$ 116,382
Servicing revenue								47,952	35,493	$ 92,933	71,519
Indirect ownership percentage										9.20%
Lexford Portfolio
Agreements and Transactions with Related Parties
Distribution received								2,500	6,000	$ 7,200	6,000
Arbor Residential Investor LLC
Agreements and Transactions with Related Parties
Indirect ownership percentage										12.30%
Other Related Party Transactions | AMAC III
Agreements and Transactions with Related Parties
Distribution received								500	300	$ 1,100	300
Other Related Party Transactions | Arbor Residential Investor LLC
Agreements and Transactions with Related Parties
Distribution from investment classified as return capital								7,500	7,500	7,500	15,000
Multifamily
Agreements and Transactions with Related Parties
Loans and investments, allowance for credit losses								74,295	27,958	74,295	27,958	18,707								58,348	37,961	22,084
Single-Family Rental
Agreements and Transactions with Related Parties
Loans and investments, allowance for credit losses								1,077	725	1,077	725	320								$ 973	781	$ 421
Maturity date of March 2025 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage				5.50%
Bridge loans | Matures In May 2025 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage			5.25%
SOFR floor, percentage			1.00%
Bridge loan, six multifamily properties | Other Related Party Transactions
Agreements and Transactions with Related Parties
UPB converted to a mezzanine loan							$ 2,000
Related Party
Agreements and Transactions with Related Parties
Due from related party								73,263		73,263											77,419
Due to related party								3,556		3,556											12,350
Amount invested												$ 4,200
Related Party | LLC
Agreements and Transactions with Related Parties
Ownership interest, percentage												49.30%
Related Party | Other Related Party Transactions
Agreements and Transactions with Related Parties
Costs for services to related party								800	900	1,500	1,700
Due from related party								73,300		73,300											77,400
Due to related party								3,600		3,600											12,400
Related Party | Other Related Party Transactions | AMAC III
Agreements and Transactions with Related Parties
Interest income								800	400	1,500	700
Amount invested								25,200		$ 25,200				$ 30,000
Ownership interest, percentage														18.00%
Related Party | Other Related Party Transactions | Lexford Portfolio
Agreements and Transactions with Related Parties
Management fee, percentage of gross revenues of underlying properties										4.75%
Related Party | Commercial Mortgage Backed Security
Agreements and Transactions with Related Parties
Loans assumed												$ 26,000
Related Party | Residential mortgage banking business | Other Related Party Transactions | ACM
Agreements and Transactions with Related Parties
Noncontrolling interest in equity method investment acquired (as a percent)																		50.00%
Related Party | Residential mortgage banking business | Other Related Party Transactions | Noncontrolling Interest
Agreements and Transactions with Related Parties
Gain (loss) on investments								$ 3,500	1,100	$ 2,600	6,100
Indirect ownership percentage										12.30%
Related Party | Residential mortgage banking business | Other Related Party Transactions | ACM
Agreements and Transactions with Related Parties
Acquisition purchase price																		$ 9,600
Related Party | ACM Acquisition | Other Related Party Transactions | ACM
Agreements and Transactions with Related Parties
Number of shares held by related party (in shares) | shares								2,535,870		2,535,870
OP units hold as part of acquisition (in shares) | shares										10,615,085
Aggregate percentage of voting power held by related party								6.60%		6.60%
Related Party | Multifamily | Fannie Mae Mortgage | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount																$ 46,900
Percentage of ownership interest of related party in the entity																17.60%
Percentage of maximum loss-sharing obligation unpaid principal balance																5.00%
Servicing revenue								$ 100	100	$ 100	100
Related Party | Retail property
Agreements and Transactions with Related Parties
Property purchased												32,500
Related Party | Matures in April 2023 | Multifamily | Other Related Party Transactions
Agreements and Transactions with Related Parties
Number of properties owned | property													2
Related Party | Maturity date of August 2022 | One multifamily property | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount													$ 35,400
Related Party | Maturity date of March 2030 | Private Label | Other Related Party Transactions | Lexford Portfolio
Agreements and Transactions with Related Parties
Principal amount													34,600
Related Party | Preferred equity investments
Agreements and Transactions with Related Parties
Loans and investments, allowance for credit losses								8,000		8,000											$ 8,000
Related Party | Preferred equity investments | Single-Family Rental | Other Related Party Transactions
Agreements and Transactions with Related Parties
Investment made													$ 4,600
Related Party | Preferred equity investments | Matures in April 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Fixed rate of interest													12.00%
Related Party | Preferred equity investments | Maturity Date June 2027
Agreements and Transactions with Related Parties
Equity investment								9,600		9,600
Related Party | Preferred equity investments | Maturity date of September 2019 | Multifamily | Other Related Party Transactions
Agreements and Transactions with Related Parties
Equity investment													$ 3,400
Related Party | Mezzanine Loans | Matures in April 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Fixed rate of interest													9.00%
Related Party | Bridge loans | Other Related Party Transactions
Agreements and Transactions with Related Parties
Equity participation interest (as a percentage)													18.90%
Related Party | Bridge loans | Single-Family Rental | Other Related Party Transactions
Agreements and Transactions with Related Parties
Loan committed										20,100
Investment made													$ 3,500
Loan committed upsized			$ 38,400
Related Party | Bridge loans | Maturity Date December 2025
Agreements and Transactions with Related Parties
Interest income								100		100
Related Party | Bridge loans | Maturity Date December 2025 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount																			$ 56,900
Loan committed		$ 1,200
Number of officers making minority equity investments | officer																			2
Equity investment																			$ 500
Equity participation interest (as a percentage)																			4.00%
Related Party | Bridge loans | Maturity Date December 2025 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage																			5.50%
SOFR floor, percentage		3.25%
Related Party | Bridge loans | Maturity date of March 2025
Agreements and Transactions with Related Parties
Interest income								100		100
Related Party | Bridge loans | Maturity date of March 2025 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount				$ 46,200		$ 39,400
Loan committed										2,000
Interest income								100	100	100	100
Related Party | Bridge loans | Maturity date of March 2025 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Equity participation interest (as a percentage)				70.00%
Related Party | Bridge loans | Maturity date of March 2025 | SOFR | Other Related Party Transactions | Subsequent event
Agreements and Transactions with Related Parties
Base spread, percentage	4.00%
SOFR floor, percentage	0.25%
Related Party | Bridge loans | Maturity date of March 2025 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage						4.00%
SOFR floor, percentage						0.25%
Equity participation interest (as a percentage)						2.25%
Related Party | Bridge loans | Maturity date of May 2025 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount					$ 67,100
Interest income								100	100	100	100
Related Party | Bridge loans | Maturity date of May 2025 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage					4.63%
SOFR floor, percentage					0.25%
Equity participation interest (as a percentage)					2.25%
Related Party | Bridge loans | Maturity date of May 2025 | Single-Family Rental | Other Related Party Transactions
Agreements and Transactions with Related Parties
Loan committed													30,500
Related Party | Bridge loans | Maturity date of March 2024 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Loan committed												$ 63,400
Interest income								1,500	800	2,800	1,500
Related Party | Bridge loans | Maturity date of March 2024 | SOFR | Other Related Party Transactions | Subsequent event
Agreements and Transactions with Related Parties
Base spread, percentage	3.75%
SOFR floor, percentage	0.25%
Related Party | Bridge loans | Maturity date of March 2024 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage												3.75%
SOFR floor, percentage												0.25%
Related Party | Bridge loans | Matures in October 2023 | Single-Family Rental | Other Related Party Transactions
Agreements and Transactions with Related Parties
Loan committed													$ 32,500
Related Party | Bridge loans | Matures in May 2023 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage													5.50%
SOFR floor, percentage													0.75%
Amount invested								26,700		26,700
Related Party | Bridge loans | Matures in April 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Interest income								800	300	1,500	600
Related Party | Bridge loans | Maturity Date July 2023
Agreements and Transactions with Related Parties
Principal amount								35,000		35,000
Related Party | Bridge loans | Maturity date of August 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Interest income								500	300	1,000	600
Percentage of ownership interest of related party in the entity															75.00%
Related Party | Bridge loans | Maturity Date Of June 2021 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount															$ 280,500
Number of bridge loans originated | loan															12
Number of multifamily properties renovated | property															72
Related Party | Bridge loans | Maturity Date Of June 2021 | Other Related Party Transactions | Lexford Portfolio
Agreements and Transactions with Related Parties
Base spread, percentage															4.00%
Distribution received								2,500	6,000	7,200
Paydowns of principal made by borrower														$ 250,000
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners								50,000		50,000
Related Party | Bridge loan, one multifamily property | Maturity date of August 2022 | SOFR | Other Related Party Transactions
Agreements and Transactions with Related Parties
Variable rate, spread	3.50%
Related Party | Bridge loan, one multifamily property | Maturity date of August 2022 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Variable rate, spread													3.50%
Related Party | Bridge loan, one multifamily property | Maturity date of August 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount															$ 21,700
Related Party | Bridge loan, several multifamily properties | Maturity date of August 2023 | SOFR | Other Related Party Transactions | Subsequent event
Agreements and Transactions with Related Parties
Base spread, percentage	4.75%
SOFR floor, percentage	0.25%
Related Party | Bridge loan, several multifamily properties | Maturity date of August 2023 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage															4.75%
SOFR floor, percentage															0.25%
Related Party | Bridge loan, two multifamily properties | Matures in April 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount													$ 14,800
Interest income								100	100
Percentage of ownership interest of related party in the entity													50.00%
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2022 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount																$ 28,000
Base spread, percentage																1.80%
Interest income									300		800
Percentage of ownership interest of related party in the entity																45.00%
Number of properties owned | property																2
Number of bridge loans originated | loan																2
Refinanced loan amount																$ 31,100
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2022 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage																4.00%
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2022 | Minimum | Other Related Party Transactions
Agreements and Transactions with Related Parties
SOFR floor, percentage																1.24%
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2022 | Maximum | Other Related Party Transactions
Agreements and Transactions with Related Parties
SOFR floor, percentage																1.54%
Related Party | Bridge loan, two multifamily properties | Maturity date of 2020 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage																5.25%
Related Party | AMAC III | Other Related Party Transactions
Agreements and Transactions with Related Parties
Gain (loss) on investments								(500)	(600)	(900)	(1,100)
Related Party | AMAC III | Mezzanine Loans | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount														7,000
Related Party | AMAC III | Bridge loan, one multifamily property | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount														$ 34,000
Related Party | Lexford Portfolio | Maturity date of March 2030 | Private Label | Other Related Party Transactions
Agreements and Transactions with Related Parties
Fixed rate of interest													3.30%
Related Party | Lexford Portfolio | Bridge loans | Maturity date December 2029 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Maximum exposure under guaranty								600,000		600,000
Immediate Family Member of Management or Principal Owner | LLC
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity												10.00%
Immediate Family Member of Management or Principal Owner | Maturity date of March 2025 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity				10.00%
Immediate Family Member of Management or Principal Owner | Matures in October 2023 | Preferred equity interest financing agreement | Other Related Party Transactions
Agreements and Transactions with Related Parties
Interest income								$ 600		1,200	500
Immediate Family Member of Management or Principal Owner | Preferred equity investments | Matures in October 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Fixed rate of interest													12.00%
Immediate Family Member of Management or Principal Owner | Bridge loans | Other Related Party Transactions
Agreements and Transactions with Related Parties
Equity participation interest (as a percentage)													21.80%
Immediate Family Member of Management or Principal Owner | Bridge loans | Matures in October 2023 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage													5.50%
Interest income									300
Immediate Family Member of Management or Principal Owner | Bridge loans | Matures in October 2023 | Other Related Party Transactions | Subsequent event
Agreements and Transactions with Related Parties
Base spread, percentage	5.50%
Immediate Family Member of Management or Principal Owner | Bridge loans | Matures in October 2023 | SOFR | Other Related Party Transactions | Subsequent event
Agreements and Transactions with Related Parties
SOFR floor, percentage	0.75%
Immediate Family Member of Management or Principal Owner | Bridge loans | Matures in October 2023 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
SOFR floor, percentage													0.75%
Chief executive officer
Agreements and Transactions with Related Parties
Reimbursement for flights chartered by the company's executives										$ 400	700
Chief executive officer | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of our former manager's outstanding membership interest of related party in another related party								35.00%		35.00%
Chief executive officer | Minimum | Other Related Party Transactions
Agreements and Transactions with Related Parties
Ownership percentage limit of our common stock under company charter								5.00%		5.00%
Chief executive officer | Mezzanine Loans | Maturity date of January 2024 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Fixed rate of interest							10.00%
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of January 2019 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Principal amount																	$ 48,000
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage														4.50%
Number of properties owned | property																	6
Proceeds from repayment in full														$ 10,900		$ 6,800
Number of bridge loans paid off | loan															4	1
Proceeds from repayment of debt														28,300
Remaining bridge loan from repayment														$ 12,900
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | London Interbank Offered Rate (LIBOR) 1 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Base spread, percentage														0.25%
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | Minimum | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity																	10.50%
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of 2019 | Maximum | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of ownership interest of related party in the entity																	12.00%
Chief executive officer | Bridge loan, six multifamily properties | Maturity date of January 2024 | Other Related Party Transactions
Agreements and Transactions with Related Parties
Interest income										$ 100	100
Director | Other Related Party Transactions
Agreements and Transactions with Related Parties
Number of Kaufman Entities | entity								2		2
Director | Fannie Mae Mortgage | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of maximum loss-sharing obligation unpaid principal balance																20.00%
Servicing revenue								$ 100	$ 100	$ 100	$ 100
Loan purchased a multifamily apartment complex which assumed																$ 8,300
Percentage of ownership after transaction										3.60%
Percentage of loan assumption fee																1.00%
Director | Ginkgo Investment Company LLC | Other Related Party Transactions
Agreements and Transactions with Related Parties
Percentage of managing member																33.00%

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_ConversionOfMortgageLoansToMezzanineLoans
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum variable interest rate for loans receivable.

+ References

No definition available.

+ Details

Name:	abr_LoansReceivableFloorInterestRate
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the refinanced balance with mezzanine loan by unaffiliated borrower.

+ References

No definition available.

+ Details

Name:	abr_MortgageLoansOnRealEstateRefinancedAmount
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of Entities

+ References

No definition available.

+ Details

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

X

- 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

X

- Definition

Number of Officers

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	abr_OwnershipPercentageLimit
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the cash outflow during the reporting period in respect of payments for loans and investments funded and purchased by the reporting entity.

+ References

No definition available.

+ Details

Name:	abr_PaymentForLoansAndInvestmentsFundedOriginatedAndPurchasedNet
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of Payments To Purchase Property.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of equity participation interest.

+ References

No definition available.

+ Details

Name:	abr_PercentageOfEquityParticipationInterest
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represent information pertaining to percentage of loan assumption fee.

+ References

No definition available.

+ Details

Name:	abr_PercentageOfLoanAssumptionFee
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to fund under the related party commitment.

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyLoanCommitmentAmount
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represent information pertaining to related party, percentage of management.

+ References

No definition available.

+ Details

Name:	abr_RelatedPartyPercentageInManagement
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- 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

X

- Definition

The upsized amount the entity agreed to fund under the related party commitment.

+ References

No definition available.

+ Details

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

X

- 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
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Footnote 6
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

+ Details

Name:	srt_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Paragraph Column F
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

+ Details

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

X

- Definition

Amount of obligations incurred and payable classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

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

X

- 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
-Name Accounting Standards Codification
-Section 30
-Paragraph 8
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479637/805-30-30-8

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 30
-Paragraph 7
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479637/805-30-30-7

+ Details

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

X

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-2

+ Details

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

X

- Definition

Costs of sales and operating expenses for the period incurred from transactions with related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 21D
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-21D

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

+ Details

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

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481664/323-10-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-25

+ Details

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

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

+ Details

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

X

- Definition

Amount of realized and unrealized gain (loss) on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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

X

- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column E)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480167/946-830-55-10

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 45
-Paragraph 39
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480228/946-830-45-39

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(1)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column E)(Footnote 6)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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

X

- Definition

The fair value of loans assumed in noncash investing or financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-5

+ Details

Name:	us-gaap_LoansAssumed1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage added to reference rate used to compute variable rate on loan receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

+ Details

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

X

- 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

X

- Definition

Amount due from parties in nontrade transactions, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

X

- 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
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

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

X

- 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/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 21D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-21D

+ Details

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

X

- Definition

The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

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

X

- Definition

The percentage charged for managing real estate properties.

+ References

No definition available.

+ Details

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

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

+ Details

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

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

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

X

- Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_ArborResidentialInvestorLLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=abr_OtherRelatedPartyTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_RealEstateInvestmentFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturesInMay2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_BridgeLoanSixMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_LimitedLiabilityCompany1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	dei_LegalEntityAxis=abr_ACMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=abr_ACMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturesInApril2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfAugust2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_PreferredEquityInvestmentsInMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateJune2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_MezzanineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateDecember2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=abr_LondonInterbankOfferedRateLIBOR1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMay2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturesInOctober2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturesInMay2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateJuly2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfAugust2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_BridgeLoanOneMultifamilyPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_BridgeLoanSeveralMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_BridgeLoanTwoMultifamilyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfOctober2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOf2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis=abr_RealEstateInvestmentFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateDecember2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOfJanuary2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	abr_LoansReceivableMaturityAxis=abr_MaturityDateOf2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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