XML 70 R60.htm IDEA: XBRL DOCUMENT v3.24.3

Mortgage Servicing - Schedule of Product and Geographic Concentration (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) loan state	Dec. 31, 2023 USD ($) state loan
Mortgage Servicing
Number of bridge loans sold | loan	4	4
Concentration risk, threshold for disclosure	4.00%	4.00%
MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 33,011,759	$ 30,983,455
MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	100.00%	100.00%
New York | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	11.00%	11.00%
Texas | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	11.00%	11.00%
North Carolina | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	8.00%	8.00%
California | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	7.00%	8.00%
Georgia | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	6.00%	6.00%
Florida | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	6.00%	6.00%
New Jersey | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	5.00%	5.00%
Illinois | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total		4.00%
Other | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	46.00%	41.00%
Number of states | state	0	0
Fannie Mae | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 22,526,022	$ 21,264,578
Fannie Mae | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	68.00%	69.00%
Freddie Mac | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 5,820,026	$ 5,181,933
Freddie Mac | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	18.00%	17.00%
Private Label | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 2,619,485	$ 2,510,449
Private Label | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	8.00%	8.00%
FHA | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 1,390,766	$ 1,359,624
FHA | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	4.00%	4.00%
Bridge | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 380,379	$ 379,425
Bridge | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	1.00%	1.00%
SFR - Fixed Rate. | MSRs
Mortgage Servicing
Product Concentrations, UPB	$ 275,081	$ 287,446
SFR - Fixed Rate. | MSRs | Fee-based servicing portfolio
Mortgage Servicing
Product Concentrations, % of Total	1.00%	1.00%

X

- Definition

Number of states accounted for more than 4% of unpaid principal balance and related servicing revenues.

+ References

No definition available.

+ Details

Name:	abr_ConcentrationRiskNumberOfStatesOver4PercentRevenues
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Concentration Risk, Threshold, Percentage

+ References

No definition available.

+ Details

Name:	abr_ConcentrationRiskThresholdPercentage
Namespace Prefix:	abr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Bridge Loans Sold

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of unpaid principal balance to total unpaid principal balance as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	abr_PercentageOfUnpaidPrincipalBalance
Namespace Prefix:	abr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosuresPertainingToServicingAssetsAndServicingLiabilitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Subparagraph (a)
-Paragraph 4
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

Name:	us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ServicingContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueRightsGrantedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_NC
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_GA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_NJ
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_IL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=abr_OtherStatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_FederalNationalMortgageAssociationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_FederalHomeLoanMortgageCorporationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_PrivateLabelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_FederalHousingAdministrationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_BridgeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=abr_SingleFamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: