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Loans and Investments, Interest Reserves (Details) $ in Millions | Sep. 30, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
--- | --- | ---
Loans and Investments |  |
Total interest reserves | $ 30.1 | $ 20.4
Number of loans | loan | 70 | 75
Aggregate unpaid principal balance | $ 1,090.0 | $ 1,010.0

X
- Definition Amount of funds placed into an interest reserve, based on contractual requirements, to cover debt service costs. + References No definition available. + Details
Name: | abr_FundedInterestReserves
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the number of loans with funded interest reserves. + References No definition available. + Details
Name: | abr_FundedInterestReservesNumberOfLoans
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of unpaid principal balance of receivables with funded interest reserves. + References No definition available. + Details
Name: | abr_FundedInterestReservesUnpaidPrincipalBalance
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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