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Loans and Investments, Interest Reserves (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Loans and Investments
Interest reserve held	$ 41.3	$ 52.5
Number of loans covered under interest reserve | loan	98	81
Aggregate UPB covered under interest reserve	$ 2,010.0	$ 1,570.0

X

- Definition

Carrying amount as of the balance sheet date pertaining to interest reserve funded to cover debt service costs, based on contractual requirements.

+ References

No definition available.

+ Details

Name:	abr_InterestReserve
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Number of loans covered under the interest reserve fund.

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No definition available.

+ Details

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

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- Definition

Amount of aggregate unpaid principal balance covered under the interest reserve fund.

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No definition available.

+ Details

Name:	abr_InterestReserveUnpaidPrincipalBalance
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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