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Debt Obligations (Details 8) (USD $) | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Real Estate owned Multifamily Portfolio | Dec. 31, 2013 Real Estate owned Multifamily Portfolio | Sep. 30, 2014 First mortgage Multifamily Portfolio | Sep. 30, 2014 First mortgage Multifamily Portfolio | Sep. 30, 2014 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage | Dec. 31, 2013 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage | Dec. 31, 2014 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage Real Estate held for sale item | Sep. 30, 2014 Mortgage Notes Payable - Real Estate Held-For-Sale First mortgage Real Estate held for sale Multifamily Portfolio item | Sep. 30, 2014 Mortgage Notes Payable - Real Estate Owned First mortgage Multifamily Portfolio
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Mortgage note payable - real estate owned | $ 25,022,701 | $ 42,745,650 | $ 25,000,000 | $ 42,700,000 |  |  | $ 48,800,000 | $ 53,800,000 |  |  |
Reduction in mortgage note payable | 4,937,098 |  |  |  | 1,300,000 | 1,600,000 |  |  | 11,100,000 |  | 3,400,000
Variable interest rate, description |  |  |  |  |  |  | one-month LIBOR |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  | 1.23% |  |  |  |
Investment classified as real estate held-for-sale |  |  |  |  |  |  |  | 11,000,000 |  |  |
Mortgage note payable - real estate held-for-sale | $ 23,791,205 | $ 11,005,354 |  |  |  |  |  |  |  | $ 23,800,000 |
Number of properties sold |  |  |  |  |  |  |  |  | 1 |  |
Number of real estate properties classified as held-for-sale |  |  |  |  |  |  |  |  |  | 3 |

X
- Definition Represents the value of investment transferred to real estate held-for-sale in noncash transactions during the reporting period. + References No definition available. + Details
Name: | abr_InvestmentTransferredToRealEstateHeldForSaleFairValue
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the liability for mortgage notes payable by the reporting entity in connection with the acquisition of real property which is held-for-sale. + References No definition available. + Details
Name: | abr_MortgageNotePayableHeldForSale
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the liability for mortgage notes payable by the reporting entity in connection with the acquisition of real property. + References No definition available. + Details
Name: | abr_MortgageNotesPayableRealEstateOwned
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of real estate properties classified as held-for-sale within the portfolio. + References No definition available. + Details
Name: | abr_NumberOfRealEstatePropertiesClassifiedAsHeldForSale
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate properties sold within the portfolio. + References No definition available. + Details
Name: | abr_NumberOfRealEstatePropertiesSold
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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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- Details
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Namespace Prefix: | us-gaap_
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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