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Basis of Presentation and Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2024
Summary of Significant Accounting Policies [Line Items] |
Period of a loan past due becomes delinquent | 60 days
Period following acquisition in which the entity finalizes the purchase price allocation of the real estate properties acquired | 1 year
Fannie Mae |
Summary of Significant Accounting Policies [Line Items] |
Percentage of loss obligation on UPB | 5.00%
Obligated funding percentage of mortgage delinquencies | 100.00%
Percentage of additional loss obligation on UPB | 5.00%
Loss sharing funding percentage of advances until final settlement | 25.00%
Minimum |
Summary of Significant Accounting Policies [Line Items] |
Maximum number of days held-for-sale loans are generally transferred or sold | 60 days
Minimum | Treasury futures |
Summary of Significant Accounting Policies [Line Items] |
Treasury futures rate period | 5 years
Minimum | MSRs | Commercial Loan | Discount rate |
Summary of Significant Accounting Policies [Line Items] |
Derivative financial instruments measurement input | 0.08
Maximum |
Summary of Significant Accounting Policies [Line Items] |
Maximum number of days held-for-sale loans are generally transferred or sold | 180 days
Maximum | Treasury futures |
Summary of Significant Accounting Policies [Line Items] |
Treasury futures rate period | 10 years
Maximum | MSRs | Commercial Loan | Discount rate |
Summary of Significant Accounting Policies [Line Items] |
Derivative financial instruments measurement input | 0.14
Maximum | Fannie Mae |
Summary of Significant Accounting Policies [Line Items] |
Percentage of loss obligation on UPB | 20.00%
Weighted average | MSRs | Commercial Loan | Discount rate |
Summary of Significant Accounting Policies [Line Items] |
Derivative financial instruments measurement input | 0.12

X
- Definition Funding percentage of mortgage delinquencies which includes principal and interest and servicing advances. + References No definition available. + Details
Name: | abr_FundingPercentageOfMortgageDelinquencies
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of input used to measure loan, held to maturity. + References No definition available. + Details
Name: | abr_LoansHeldToMaturityMeasurementInput
Namespace Prefix: | abr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents percentage of loss sharing funding percentage of advances until final settlement. + References No definition available. + Details
Name: | abr_LossSharingFundingPercentageOfAdvancesUntilFinalSettlement
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of additional loss on unpaid principal balance as an obligation to partially guarantee the performance of the loan. + References No definition available. + Details
Name: | abr_PercentageOfAdditionalLossOnUnpaidPrincipalBalance
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of loss on unpaid principle balance as an obligation to partially guarantee the performance of the loan. + References No definition available. + Details
Name: | abr_PercentageOfLossOnUnpaidPrincipleBalance
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of debt instrument past due becomes delinquent. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum period from the origination date a loan receivables held-for-sale will be sold. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period following the date of acquisition which the entity finalizes the purchase price allocation of the real estate properties acquired. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclose basis of Presentation and significant Accounting Policies with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:stringItemType
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- Definition Treasury Futures Rate Period + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
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