XML 102 R87.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Debt Obligations - Credit and Repurchase Facilities Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Jan. 31, 2025 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |
Outstanding letters of credit | $ 5.0 |  |
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Advance rate (as a percent) | 70.00% |  |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Advance rate (as a percent) | 80.00% |  |
Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average note rate including certain fees and costs (as a percent) | 7.43% |  | 8.26%
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreement used to finance leasehold and capital expenditure improvements at corporate office (as a percent) | 67.00% |  | 69.00%
Agency Business | Freddie Mac Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding letters of credit | $ 5.0 |  |
Agency Business | Fannie Mae Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding letters of credit | 70.0 |  |
Joint Repurchase Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 2,000.0 |  |
Extension of maturity date (in years) | 1 year |  |
Joint Repurchase Facility | Private Label |  |  |
Debt Instrument [Line Items] |  |  |
Advance rate (as a percent) | 80.00% |  |
$1B repurchase facility |  |  |
Debt Instrument [Line Items] |  |  |
Extension of maturity date (in years) | 1 year |  |
$1B repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 1,000.0 |  |
$1B repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.50% |  |
$1B repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 1,000.0 |  |
Line of credit facility, expiration period | 6 months |  |
Line of credit facility, repurchase period | 6 months |  |
$1B repurchase facility | Structured Business | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.50% |  |
$1B repurchase facility | Structured Business | Minimum | Multi Family |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 3.26% |  |
$750M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 750.0 |  |
$650M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 650.0 |  |
$650M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
SOFR floor rate | 0.25% |  |
$650M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.46% |  |
$650M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 3.11% |  |
$500M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 500.0 |  |
Variable rate, spread (as a percent) | 1.75% |  |
SOFR floor (as a percentage) | 0.15% |  |
$500M credit facility | Structured Business | March 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.25% |  |
SOFR floor (as a percentage) | 0.15% |  |
$250M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 250.0 |  |
Extension of maturity date (in years) | 1 year |  |
Variable rate, spread (as a percent) | 3.25% |  |
SOFR floor (as a percentage) | 2.50% |  |
$649 repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 649.0 |  |
$400M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 400.0 |  |
Variable rate, spread (as a percent) | 3.25% |  |
SOFR floor (as a percentage) | 1.00% |  |
Maturity period extension (in years) | 1 year |  |
$400M credit facility | Structured Business | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 400.0 |
$350M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 350.0 |  |
Maturity period extension (in years) | 1 year |  |
$350M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.00% |  |
$250M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 250.0 |  |
Extension of maturity date (in years) | 1 year |  |
Variable rate, spread (as a percent) | 3.25% |  |
SOFR floor (as a percentage) | 2.00% |  |
$250M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 250.0 |  |
Maturity period extension (in years) | 1 year |  |
$250M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.00% |  |
$250M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.65% |  |
$200M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
$200M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 1.75% |  |
$200M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 3.50% |  |
$200M repurchase facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
Maturity period extension (in years) | 1 year |  |
$200M repurchase facility | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate increase | 2.55% |  |
$200M repurchase facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
$150M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 150.0 |  |
Variable rate, spread (as a percent) | 3.00% |  |
$150M credit facility | Structured Business | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average loan spread | 0.0550 |  |
$134M loan specific credit facilities | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 134.1 |  |
$134M loan specific credit facilities | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 1.91% |  |
$134M loan specific credit facilities | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.40% |  |
SOFR floor rate | 2.40% |  |
$134M loan specific credit facilities | Structured Business | Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
SOFR floor rate | 6.15% |  |
Interest rate | 0.85% |  |
$40M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 40.0 |  |
Maturity period extension (in years) | 1 year |  |
$40M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 2.35% |  |
$35M working capital facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 35.0 |  |
$35M working capital facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 3.00% |  |
Q Series securitization |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average note rate including certain fees and costs (as a percent) | 7.46% |  | 7.99%
Q Series securitization | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 1.50% |  |
Maturity period extension (in years) | 1 year |  |
Q Series securitization | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 3.50% |  |
$750M ASAP agreement | Agency Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 750.0 |  |
SOFR floor rate | 0.25% |  |
Value of portfolio loans and cash as collateral | $ 750.0 |  |
Debt instrument, reduced basis spread on variable rate | 1.15% |  |
$500M joint repurchase facility | Agency Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 500.0 |  |
Debt instrument, reduced basis spread on variable rate | 1.48% |  |
$200M credit facility | Structured Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
$200M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 1.40% |  |
$200M credit facility | Agency Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
$200M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
Variable rate, spread (as a percent) | 1.35% |  |
$200M credit facility | Agency Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200.0 |  |
Additional 200 million credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate, spread (as a percent) | 1.75% |  |
Additional borrowing capacity | $ 200.0 |  |
Line of credit facility, sublimit for principal and interest advances | 37.5 |  |
$50M credit facility | Agency Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 50.0 |  |
Variable rate, spread (as a percent) | 1.35% |  |
$75 Million credit facility | Agency Business |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 75.0 |  |
Interest rate | 2.875% |  |
$75 Million credit facility | Agency Business | Freddie Mac Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Committed amount | $ 5.0 |  |

X
- Definition Represents the advance rate related to debt instruments. + References No definition available. + Details
Name: | abr_DebtInstrumentAdvanceRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument extension term of bridge loan during the period. + References No definition available. + Details
Name: | abr_DebtInstrumentExtensionTerm
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum variable interest rate for debt instruments. + References No definition available. + Details
Name: | abr_DebtInstrumentFloorRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Length of the extension period of the debt instrument. + References No definition available. + Details
Name: | abr_DebtInstrumentMaturityDateLengthOfExtensionPeriod
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reduced percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | abr_DebtInstrumentReducedBasisSpreadOnVariableRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs. + References No definition available. + Details
Name: | abr_DebtWeightedAverageInterestRateIncludingFeesAndCosts
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Leverage capital divided by average loan and investment assets as defined in the agreements. + References No definition available. + Details
Name: | abr_LeverageCapitalToLoanAndInvestmentPortfolio
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Additional maximum borrowing capacity under the credit facility. + References No definition available. + Details
Name: | abr_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents debt instrument commitment amount, under the option of temporarily increasing the amount that could be borrowed. + References No definition available. + Details
Name: | abr_LineOfCreditFacilityCommitmentAmount
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line Of Credit Facility, Repurchase Period + References No definition available. + Details
Name: | abr_LineOfCreditFacilityRepurchasePeriod
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line Of Credit Facility, Sublimit For Principal And Interest Advances + References No definition available. + Details
Name: | abr_LineOfCreditFacilitySublimitForPrincipalAndInterestAdvances
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum variable interest rate for loans receivable. + References No definition available. + Details
Name: | abr_LoansReceivableFloorInterestRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Loan Spread + References No definition available. + Details
Name: | abr_WeightedAverageLoanSpread
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
Name: | us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Incremental percentage increase (decrease) in the stated rate on a debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69F -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69F Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I Reference 26: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 27: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=abr_StructuredTransactionBusinessSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=abr_AgencyBusinessSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_JointRepurchaseFacilityMember
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_DebtInstrumentAxis=abr_JointRepurchaseFacility1.00BillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_RepurchaseFacility1BillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=abr_MultiFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility750MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_RepurchaseFacility650MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility500MillionPerformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_DebtInstrumentRateChangeEffectivePeriodAxis=abr_March2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility250MillionNonperformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_WarehouseRepurchaseFacility649MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility400MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_RepurchaseFacility350MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_RepurchaseFacility250MillionMaturity2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_RepurchaseFacility250MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A200MillionRepurchaseFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A200MillionRepurchaseFacility1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility150MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_LoanSpecificCreditFacilities143MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A40MCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A35MWorkingCapitalFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_QSeriesSecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A750MASAPAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A500MJointRepurchaseFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A200MCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacility200Million2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_Additional200MillionCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_A50MCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_CreditFacilitySeventyFiveMillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |