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Mortgage Servicing - Schedule of Components of Servicing Revenue, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Transfers and Servicing [Abstract]
Servicing fees	$ 33,948	$ 32,543
Interest earned on escrows	10,219	12,890
Prepayment fees	913	1,034
Write-offs and payoffs of MSRs	(1,047)	(3,106)
Amortization of MSRs	(18,293)	(17,758)
Servicing revenue, net	$ 25,740	$ 25,603

X

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer, net of amortization of mortgage servicing rights (MSRs).

+ References

No definition available.

+ Details

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X

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer, net of amortization of mortgage servicing rights (MSRs).

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of interest earned on escrows.

+ References

No definition available.

+ Details

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X

- Definition

The amount of write-offs mortgage servicing rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	abr_
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Balance Type:	credit
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X

- Definition

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

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X

- Definition

Amount of income earned, after hedging basis adjustments, from fees charged for prepayment of certain Federal Home Loan Bank (FHLBank) advances before original maturity.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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