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v3.26.1

Debt Obligations - Debt Covenants (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2026 | Jan. 31, 2026 | Oct. 31, 2025 | Jul. 31, 2025 | Apr. 30, 2025 | Mar. 31, 2026
CLO 17 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  | 127.77% | 127.02% | 124.46% | 122.65% | 136.30%
Limit |  |  |  |  |  | 121.51%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 155.42%
Limit |  |  |  |  |  | 120.00%
CLO 17 | Subsequent event |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current | 136.30% |  |  |  |  |
CLO 18 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  | 136.54% | 131.38% | 130.03% | 127.91% | 139.84%
Limit |  |  |  |  |  | 123.03%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 134.63%
Limit |  |  |  |  |  | 120.00%
CLO 18 | Subsequent event |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current | 139.84% |  |  |  |  |
BTR CLO 1 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  | 117.47% | 117.47% | 117.47% |  | 117.47%
Limit |  |  |  |  |  | 115.47%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 151.92%
Limit |  |  |  |  |  | 120.00%
BTR CLO 1 | Subsequent event |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current | 117.47% |  |  |  |  |
CLO 20 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  | 112.52% | 112.52% |  |  | 112.52%
Limit |  |  |  |  |  | 110.52%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 135.00%
Limit |  |  |  |  |  | 120.00%
CLO 20 | Subsequent event |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current | 112.52% |  |  |  |  |
CLO 21 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 113.15%
Limit |  |  |  |  |  | 111.15%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 130.39%
Limit |  |  |  |  |  | 120.00%
CLO 21 | Subsequent event |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current | 113.15% |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Amount payable on default of senior debt |  |  |  |  |  | $ 0

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-types: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
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Namespace Prefix: | abr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount payable on default of senior debt under debt instrument. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Interest Coverage + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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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Namespace Prefix: | abr_
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- Definition Overcollateralization + References No definition available. + Details
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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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Period Type: | duration

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- Details
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- Details
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- Details
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