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Loans and Investments (Details 7) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 item
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Loans and Investments |
Total interest reserves | $ 15.8
Number of loans | 53
Aggregate unpaid principal balance | $ 715.9

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