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Loans and Investments, Loan Modifications, Refinancings and/or Extensions (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 loan	Sep. 30, 2016 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan
Troubled debt restructurings by asset class
Number of Loans | loan		2		2
Original Unpaid Principal Balance		$ 16,961,456		$ 16,961,456
Original Wtd. Avg. Rate of Interest (as a percent)		5.15%		5.15%
Modified Unpaid Principal Balance		$ 16,961,456		$ 16,961,456
Modified Wtd. Avg. Rate of Interest (as a percent)		5.15%		5.15%
Number of additional loans considered to be troubled debt restructurings | loan	0	0	0	0
Hotel
Troubled debt restructurings by asset class
Number of Loans | loan			1
Original Unpaid Principal Balance			$ 34,750,000
Original Wtd. Avg. Rate of Interest (as a percent)			4.01%
Modified Unpaid Principal Balance			$ 34,750,000
Modified Wtd. Avg. Rate of Interest (as a percent)			4.01%
Multifamily
Troubled debt restructurings by asset class
Number of Loans | loan		1		1
Original Unpaid Principal Balance		$ 14,646,456		$ 14,646,456
Original Wtd. Avg. Rate of Interest (as a percent)		5.33%		5.33%
Modified Unpaid Principal Balance		$ 14,646,456		$ 14,646,456
Modified Wtd. Avg. Rate of Interest (as a percent)		5.33%		5.33%
Office
Troubled debt restructurings by asset class
Number of Loans | loan		1		1
Original Unpaid Principal Balance		$ 2,315,000		$ 2,315,000
Original Wtd. Avg. Rate of Interest (as a percent)		4.03%		4.03%
Modified Unpaid Principal Balance		$ 2,315,000		$ 2,315,000
Modified Wtd. Avg. Rate of Interest (as a percent)		4.03%		4.03%

X

- Definition

Represents the number of additional financing receivables that have been modified during the period that the entity considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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X

- Definition

The number of financing receivables that have been modified during the period that the company considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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X

- Definition

The amount of unpaid principal balance (after modification) in financing receivables that have been modified during the period that the company considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of the outstanding recording investment related to financing receivables modified during the period that the company considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents the weighted average interest rate on a group of loans after modifications that the company considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	abr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the weighted average interest rate on a group of loans before modifications that the company considered to be troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	abr_
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Balance Type:	na
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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