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Debt Obligations - Debt Covenants (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2025 | Oct. 31, 2024 | Jul. 31, 2024 | Apr. 30, 2024 | Jan. 31, 2024 | Dec. 31, 2024
CLO 14 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 137.46%
Limit |  |  |  |  |  | 118.76%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  | 133.88% | 132.91% | 125.22% | 120.00% | 172.64%
Limit |  |  |  |  |  | 120.00%
CLO 14 | Subsequent Event |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Current | 137.46% |  |  |  |  |
CLO 16 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 136.19%
Limit |  |  |  |  |  | 120.21%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  | 129.98% | 127.64% | 120.81% | 120.81% | 176.22%
Limit |  |  |  |  |  | 120.00%
CLO 16 | Subsequent Event |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Current | 136.19% |  |  |  |  |
CLO 17 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 122.10%
Limit |  |  |  |  |  | 121.51%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  | 123.14% | 121.78% | 121.71% | 121.71% | 152.15%
Limit |  |  |  |  |  | 120.00%
CLO 17 | Subsequent Event |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Current | 122.10% |  |  |  |  |
CLO 18 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 123.89%
Limit |  |  |  |  |  | 123.03%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  | 124.20% | 123.67% | 123.87% | 123.87% | 143.01%
Limit |  |  |  |  |  | 120.00%
CLO 18 | Subsequent Event |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Current | 123.89% |  |  |  |  |
CLO 19 |  |  |  |  |  |
Overcollateralization [Abstract] |  |  |  |  |  |
Current |  |  |  |  |  | 119.56%
Limit |  |  |  |  |  | 119.30%
Interest Coverage [Abstract] |  |  |  |  |  |
Current |  | 121.78% | 119.98% | 119.30% | 120.30% | 133.28%
Limit |  |  |  |  |  | 120.00%
CLO 19 | Subsequent Event |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Current | 119.56% |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |
Interest Coverage [Abstract] |  |  |  |  |  |
Amount payable on default of senior debt |  |  |  |  |  | $ 0

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- 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

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- 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

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- Definition Represents the amount payable on default of senior debt under debt instrument. + References No definition available. + Details
Name: | abr_DebtInstrumentCovenantsAmountPayableOnDefaultOfSeniorDebt
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest Coverage + References No definition available. + Details
Name: | abr_InterestCoverageAbstract
Namespace Prefix: | abr_
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
Name: | abr_InterestCoverageRatioCovenantCompliance
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Overcollateralization + References No definition available. + Details
Name: | abr_OvercollateralizationAbstract
Namespace Prefix: | abr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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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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