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Debt Obligations - Debt Covenants (Details)	1 Months Ended					3 Months Ended
	Apr. 30, 2025	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Mar. 31, 2025
CLO 16
Overcollateralization [Abstract]
Current		136.19%	129.98%	127.64%	120.81%	142.15%
Limit						120.21%
Interest Coverage [Abstract]
Current						190.88%
Limit						120.00%
CLO 16 | Subsequent event
Overcollateralization [Abstract]
Current	142.15%
CLO 17
Overcollateralization [Abstract]
Current		122.10%	123.14%	121.78%	121.71%	122.65%
Limit						121.51%
Interest Coverage [Abstract]
Current						147.45%
Limit						120.00%
CLO 17 | Subsequent event
Overcollateralization [Abstract]
Current	122.65%
CLO 18
Overcollateralization [Abstract]
Current		123.89%	124.20%	123.67%	123.87%	127.91%
Limit						123.03%
Interest Coverage [Abstract]
Current						145.71%
Limit						120.00%
CLO 18 | Subsequent event
Overcollateralization [Abstract]
Current	127.91%

X

- Definition

Represents the interest coverage ratio maintained during the period under covenant compliance. Interest coverage ratio is calculated by dividing interest income by interest expense for the classes senior to those retained by the entity.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the overcollateralization ratio maintained during the period under covenant compliance. Overcollateralization ratio is calculated by dividing the total principal balance of all collateral in the CDO by the total principal balance of the bonds associated with the applicable ratio.

+ References

No definition available.

+ Details

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

X

- Definition

Interest Coverage

+ References

No definition available.

+ Details

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

X

- Definition

Represents the interest coverage ratio required to be maintained under covenant compliance. Interest coverage ratio is calculated by dividing interest income by interest expense for the classes senior to those retained by the entity.

+ References

No definition available.

+ Details

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

X

- Definition

Overcollateralization

+ References

No definition available.

+ Details

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

X

- Definition

Represents the overcollateralization ratio required to be maintained under covenant compliance. Overcollateralization ratio is calculated by dividing the total principal balance of all collateral in the CDO by the total principal balance of the bonds associated with the applicable ratio.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=abr_CollateralizedLoanObligationsSixteenMember
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_DebtInstrumentAxis=abr_CollateralizedLoanObligationsSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=abr_CollateralizedLoanObligationsEighteenMember
Namespace Prefix:
Data Type:	na
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