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Loans and Investments - Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans and Investments [Abstract]
Amount of provision for credit losses	$ 55,512	$ 68,805	$ 19,318
Unfunded commitments related to structured loans and investments	2,200,000	1,310,000
Accrued interest receivable related to loans	$ 154,400	$ 124,200

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- References

No definition available.

+ Details

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- Definition

Represents the amount of outstanding unfunded commitments related to loans and investments that the entity is obligated to fund as the borrowers meet certain requirements.

+ References

No definition available.

+ Details

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Namespace Prefix:	abr_
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Balance Type:	credit
Period Type:	instant

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- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

+ Details

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Balance Type:	debit
Period Type:	instant

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- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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