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Loans and Investments (Details 7) - Jun. 30, 2015 $ in Millions | USD ($) item
--- | ---
Loans and Investments |
Total interest reserves | $ 17.7
Number of loans | item | 54
Aggregate unpaid principal balance | $ 756.4

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

X
- 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: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration