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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

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- Definition

Amount of funds placed into an interest reserve, based on contractual requirements, to cover debt service costs.

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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.

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No definition available.

+ Details

Name:	abr_FundedInterestReservesNumberOfLoans
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Definition

Amount of unpaid principal balance of receivables with funded interest reserves.

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No definition available.

+ Details

Name:	abr_FundedInterestReservesUnpaidPrincipalBalance
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	abr_LoansAndInvestmentsAbstract
Namespace Prefix:	abr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration