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Loans and Investments (Details 6) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) item | Jun. 30, 2015 USD ($) item | Jun. 30, 2014 item
Troubled debt restructurings by asset class |  |  |
Unfunded commitments on modified loans classified as troubled debt restructurings | $ |  | $ 0 |
Number of loans considered to be troubled debt restructurings that subsequently considered non-performing | 0 | 0 | 0
Number of additional loans considered to be troubled debt restructurings |  | 0 | 0
Multifamily |  |  |
Troubled debt restructurings by asset class |  |  |
Number of loans considered to be troubled debt restructurings | 4 | 5 |
Original Unpaid Principal Balance | $ | $ 29,416,546 | $ 35,609,122 |
Original Weighted Average Rate of Interest (as a percent) | 4.95% | 5.12% |
Modified Unpaid Principal Balance | $ | $ 29,416,456 | $ 35,609,122 |
Modified Weighted Average Rate of Interest (as a percent) | 4.95% | 5.12% |

X
- Definition Represents the number of additional financing receivables that have been modified during the period that the entity considered to be troubled debt restructurings. + References No definition available. + Details
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X
- Definition The number of financing receivables that have been modified during the period that the company considered to be troubled debt restructurings. + References No definition available. + Details
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X
- Definition The number of financing receivables that have been modified during the period that the company considered to be troubled debt restructurings that subsequently considered non-performing. + References No definition available. + Details
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X
- Definition The amount of unpaid principal balance (after modification) in financing receivables that have been modified during the period that the company considered to be troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the outstanding recording investment related to financing receivables modified during the period that the company considered to be troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the weighted average interest rate on a group of loans after modifications that the company considered to be troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate on a group of loans before modifications that the company considered to be troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of the unfunded commitments related to loans considered to be troubled debt restructurings. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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X
- Details
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