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Debt Obligations - Debt Covenants (Details)	1 Months Ended					9 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Sep. 30, 2024
CLO 14
Overcollateralization [Abstract]
Current		132.91%	125.22%	120.00%	119.76%	133.88%
Limit						118.76%
Interest Coverage [Abstract]
Current						165.86%
Limit						120.00%
CLO 14 | Subsequent event
Overcollateralization [Abstract]
Current	133.88%
CLO 16
Overcollateralization [Abstract]
Current		127.64%	120.81%	120.81%	121.21%	129.98%
Limit						120.21%
Interest Coverage [Abstract]
Current						169.06%
Limit						120.00%
CLO 16 | Subsequent event
Overcollateralization [Abstract]
Current	129.98%
CLO 17
Overcollateralization [Abstract]
Current		121.78%	121.71%	121.71%	122.51%	123.14%
Limit						121.51%
Interest Coverage [Abstract]
Current						159.44%
Limit						120.00%
CLO 17 | Subsequent event
Overcollateralization [Abstract]
Current	123.14%
CLO 18
Overcollateralization [Abstract]
Current		123.67%	123.87%	123.87%	124.03%	124.20%
Limit						123.03%
Interest Coverage [Abstract]
Current						146.99%
Limit						120.00%
CLO 18 | Subsequent event
Overcollateralization [Abstract]
Current	124.20%
CLO 19
Overcollateralization [Abstract]
Current		119.98%	119.30%	120.30%	120.30%	121.78%
Limit						119.30%
Interest Coverage [Abstract]
Current						138.81%
Limit						120.00%
CLO 19 | Subsequent event
Overcollateralization [Abstract]
Current	121.78%

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

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Namespace Prefix:	abr_
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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

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Namespace Prefix:	abr_
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Period Type:	duration

X

- Definition

Interest Coverage

+ References

No definition available.

+ Details

Name:	abr_InterestCoverageAbstract
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Data Type:	xbrli:stringItemType
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Period Type:	duration

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- 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

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X

- Definition

Overcollateralization

+ References

No definition available.

+ Details

Name:	abr_OvercollateralizationAbstract
Namespace Prefix:	abr_
Data Type:	xbrli:stringItemType
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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

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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