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Loans and Investments, Interest Reserves (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) loan
Loans and Investments
Interest reserve held	$ 37,000,000	$ 48,900,000
Number of loans covered under interest reserve	131	110
Aggregate UPB covered under interest reserve	$ 2,430,000,000	$ 2,220,000,000

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

X

- Definition

Number of loans covered under the interest reserve fund.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

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