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Debt Obligations (Details 6) - Range [Domain] - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2010 | Dec. 31, 2014
Debt Obligations |  |  |
Debt Carrying Value | $ 160,108,568 |  | $ 159,833,260
Junior subordinated notes |  |  |
Debt Obligations |  |  |
Debt Carrying Value | 160,100,000 |  | 159,800,000
Deferred amount Due at maturity | $ 15,700,000 |  | $ 16,000,000
Variable interest rate, description | three-month LIBOR |  |
Nonredeemable period from issue date (in years) | 2 years |  |
Weighted average note rate (as a percent) | 3.05% |  | 3.01%
Weighted average note rate including certain fees and costs (as a percent) | 3.21% |  | 3.18%
Amount of retired debt instrument |  | $ 114,100,000 |

X
- Definition Amount of the principal payments due at maturity, which is being amortized into expense over the life of the debt. + References No definition available. + Details
Name: | abr_DebtInstrumentAmountDueAtMaturity
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the period from issuance during which debt instrument was not redeemable. + References No definition available. + Details
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Namespace Prefix: | abr_
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Balance Type: | na
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X
- Definition Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs. + References No definition available. + Details
Name: | abr_DebtWeightedAverageInterestRateIncludingFeesAndCosts
Namespace Prefix: | abr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The retirement of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity. + References No definition available. + Details
Name: | abr_EarlyRetirementOfSubordinatedDebt
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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X
- 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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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