XML 63 R53.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans and Investments - Loan Modifications (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) loan | Jun. 30, 2024 USD ($) loan | Mar. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) loan | Sep. 30, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  | $ 1,000 |  |  |  |  |  |  |
Loans and investments, gross |  |  | 11,565,538 |  |  | $ 12,615,006 |  |  | $ 11,565,538 | $ 12,615,006
New borrower investments |  |  | $ 2,000 | $ 4,900 | $ 2,000 |  |  |  |  |
Rate cap strike price, percentage |  |  | 5.25% |  |  |  |  |  |  |
Total specific reserve |  |  | $ 3,500 |  |  |  |  |  | $ 3,500 |
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan |  |  | 27 |  |  | 19 |  |  | 27 | 19
Interest reserve |  |  |  |  |  |  |  |  | $ 200,400 | $ 156,100
Future funding commitments, modified loans, borrowers experiencing financial difficulty |  |  | $ 49,000 |  |  |  |  |  | $ 49,000 |
Number of loans modified not pursuant to contract | loan | 8 |  |  | 8 |  |  |  | 8 |  |
Loans modified, not pursuant to contract, amount |  |  |  |  |  |  |  | $ 212,500 |  |
Loan modification, refinancing, and extensions | loan |  |  | 0 |  |  |  |  |  | 0 | 0
Secondary Loan |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, net of reserve | $ 4,400 |  | $ 3,500 | $ 4,400 |  |  |  | 4,400 | $ 3,500 |
Loans modified in period, floor interest rate spread |  |  | 0.0375 | 0.0375 |  |  |  |  |  |
Senior Lien |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 0.0075 | 0.0050 |  |  |  |  |  |
Financing receivable, floor interest rate |  |  | 0.0575 | 0.0600 |  |  |  |  |  |
Loans modified in period, floor interest rate spread |  |  | 0.0300 | 0.0325 |  |  |  |  |  |
Senior Lien | Senior Position Loan |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, net of reserve | 32,000 |  | $ 29,000 | $ 32,000 |  |  |  | 32,000 | 29,000 |
Financial Asset, Greater Than 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  |  | 2,500 |  |  |  |  |  |
Loans and investments, gross | 32,500 |  |  | $ 32,500 |  |  |  | $ 32,500 |  |
Financial Asset, 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  |  |  |  | $ 5,000 |  |  |  |
Loans and investments, gross |  |  |  |  | 36,400 |  |  |  |  |
Financing receivable, net of reserve |  |  |  |  |  | 31,400 |  |  |  | $ 31,400
Temporary Interest Rate Relief And Extended Maturity, Six Loans | Financial Asset, Greater Than 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period | 118,900 |  |  |  |  |  |  |  |  |
Temporary Interest Rate Relief And Extended Maturity, Six Loans | Financial Asset, Less Than 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period | $ 87,500 |  |  |  |  |  |  |  |  |
Temporary Interest Rate Relief |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of loans modified not pursuant to contract | loan | 5 |  |  | 5 |  |  |  | 5 |  |
Loans modified, not pursuant to contract, amount |  |  |  |  |  |  |  | $ 123,200 |  |
Temporary Interest Rate Relief, Three Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  |  | $ 19,200 |  |  |  |  |  |
Number of loans modified not pursuant to contract | loan | 3 |  |  | 3 |  |  |  | 3 |  |
Loans modified, not pursuant to contract, amount |  |  |  | $ 81,000 |  |  |  |  |  |
Temporary Interest Rate Relief, Five Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of loans modified not pursuant to contract | loan | 5 |  |  | 5 |  |  |  | 5 |  |
Loans modified, not pursuant to contract, amount |  |  |  | $ 131,500 |  |  |  |  |  |
Bridge loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, fixed interest rate |  | 0.0300 | 0.0700 |  |  |  |  |  |  |
Financing receivable, accrual rate |  | 0.0300 |  |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  |  |  | 1,500 |  |  |  |  |
Loans and investments, gross |  |  | $ 11,169,284 |  | $ 13,500 | 12,273,244 | $ 70,500 |  | $ 11,169,284 | 12,273,244
Loans modified in period, floor interest rate spread |  |  |  |  | 0.0415 |  |  |  |  |
Variable rate, spread |  |  |  |  |  |  | 3.40% |  |  |
Fixed interest rate, first twenty four months |  |  |  |  | 0.0825 |  |  |  |  |
Fixed interest rate, last twelve months |  |  |  |  | 0.0850 |  |  |  |  |
Financing receivable, total fixed rate |  | 0.0600 |  |  |  |  |  |  |  |
Financing receivable, total fixed rate, period |  | 18 months |  |  |  |  |  |  |  |
Financing receivable, borrower required funding |  | $ 10,500 |  |  |  |  |  |  |  |
Interest reserve |  | 2,500 |  |  |  |  |  |  |  |
Financing receivable, borrower requirement, capital improvements |  | $ 8,000 |  |  |  |  |  |  |  |
Financing receivable, borrower requirement, capital improvements, period |  | 15 months |  |  |  |  |  |  |  |
Bridge loans | Loan Reduction |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Loans and investments, gross |  |  |  |  | $ 12,500 |  |  |  |  |
Multifamily | Bridge loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 6 |  | 16 |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 443,600 |  | $ 692,800 |  |  |  |  |
Weighted average pay rate | 0.0592 |  |  | 0.0730 | 0.0695 |  |  |  |  |
Financing receivable, accrual rate | 0.0262 |  |  | 0.0204 | 0.0186 |  |  |  |  |
Loans previously classified as non-performing |  |  |  |  | $ 712,900 |  |  |  |  |
Multifamily | Bridge loans | Financial Asset, Greater Than 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Loans previously classified as non-performing |  |  |  |  | 12,200 |  |  |  |  |
Multifamily | Bridge loans | Financial Asset, Less Than 60 Days Past Due |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Loans previously classified as non-performing |  |  |  |  | $ 92,700 |  |  |  |  |
Multifamily | Bridge loans | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 0.0325 |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 3.25% | 3.25% |  |  |  |  |
Multifamily | Bridge loans | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  | 0.0485 |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 5.25% | 4.25% |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 17 | 14 |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 678,200 | $ 291,900 | $ 671,000 |  |  |  |  |
Number of financing receivables with extended maturities | loan |  |  |  | 12 | 15 |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 4 months | 12 months |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 23 months | 30 months |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Sixteen Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 16 |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 663,700 |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, One Loan |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 1 |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 14,500 |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Six Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan | 6 |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period | $ 341,900 |  |  |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Two Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 2 |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 52,900 |  |  |  |  |  |  |
Financing receivable, specific reserve |  |  | $ 4,600 |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Thirteen Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 13 |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 586,300 |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Thirteen Loans | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  | 12 months |  |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Thirteen Loans | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  | 31 months |  |  |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  |  | 12 |  |  |  |  |  |
Financing receivable, amount modified in period |  |  | $ 206,800 | $ 201,900 |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  | 12 months |  |  |  |  |  |  |
Number of financing receivables with extended maturities | loan |  |  | 3 | 8 |  |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 6 months |  |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 15 months |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Fourteen Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  |  | $ 361,800 |  |  |  |  |  |
Multifamily | Bridge loans | Loan Modification, Extended Maturity, Twelve Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  |  | $ 321,700 |  |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief, Twenty Three Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  |  |  | 23 |  |  |  |  |
Financing receivable, amount modified in period |  |  |  |  | $ 1,070,000 |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan |  |  |  |  | 2 |  |  |  |  |
Loan loss reserve, specifically impaired loans |  |  |  |  | $ 7,000 |  |  |  |  |
Total UPB, specifically impaired loans |  |  |  |  | $ 49,600 |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  |  |  | 11 |  |  |  |  |
Financing receivable, amount modified in period |  |  |  |  | $ 456,500 |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  |  | 2 months |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  |  | 19 months |  |  |  |  |
Multifamily | Bridge loans | Rate of Interest and Extended Maturity |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  |  |  |  | $ 86,900 |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  |  |  | 1 year |  |  |  |
Variable rate, spread |  |  |  |  |  | 4.25% |  |  |  |
Financing receivable modified, pay rate of interest |  |  |  |  |  | $ 500 |  |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  |  |  |  | 3 |  |  |  |
Financing receivable, amount modified in period |  |  |  |  |  | $ 241,000 |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  |  |  | 1 year |  |  |  |
Percentage of deferred interest waived |  |  |  |  |  | 0.25 |  |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness | Minimum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  |  |  | 4.00% |  |  |  |
Percentage of interest foregone |  |  |  |  |  | 0.0200 |  |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness | Maximum |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  |  |  | 4.30% |  |  |  |
Percentage of interest foregone |  |  |  |  |  | 0.0215 |  |  |  |
Office |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, net of reserve |  |  |  |  |  | $ 37,100 |  |  |  | 37,100
Financing receivable, reserve for credit loss |  |  |  |  |  | 8,000 |  |  |  | $ 8,000
Loan reserve |  |  |  |  |  | $ 2,300 |  |  |  |

X
- Definition Financing Receivable, Accrued Interest, Before Allowance For Credit Loss, Previously Non-Performing Loans + References No definition available. + Details
Name: | abr_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLossPreviouslyNonPerformingLoans
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Conversion to Common Equity Investment + References No definition available. + Details
Name: | abr_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestConversionToCommonEquityInvestment
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing Receivable, Allowance For Credit Losses, Specifically Impaired Loans + References No definition available. + Details
Name: | abr_FinancingReceivableAllowanceForCreditLossesSpecificallyImpairedLoans
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing Receivable, Basis Spread On Variable Rate + References No definition available. + Details
Name: | abr_FinancingReceivableBasisSpreadOnVariableRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Borrower Required Funding + References No definition available. + Details
Name: | abr_FinancingReceivableBorrowerRequiredFunding
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Borrower Requirement, Capital Improvements + References No definition available. + Details
Name: | abr_FinancingReceivableBorrowerRequirementCapitalImprovements
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Borrower Requirement, Capital Improvements, Period + References No definition available. + Details
Name: | abr_FinancingReceivableBorrowerRequirementCapitalImprovementsPeriod
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Fixed Interest Rate + References No definition available. + Details
Name: | abr_FinancingReceivableFixedInterestRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Fixed Interest Rate, First Twenty Four Months + References No definition available. + Details
Name: | abr_FinancingReceivableFixedInterestRateFirstTwentyFourMonths
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Fixed Interest Rate, Last Twelve Months + References No definition available. + Details
Name: | abr_FinancingReceivableFixedInterestRateLastTwelveMonths
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Floor Interest Rate + References No definition available. + Details
Name: | abr_FinancingReceivableFloorInterestRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Loans Modified In Period, Equity Reinvested + References No definition available. + Details
Name: | abr_FinancingReceivableLoansModifiedInPeriodEquityReinvested
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Loans Modified In Period, Rate Cap Strike Price, Percentage + References No definition available. + Details
Name: | abr_FinancingReceivableLoansModifiedInPeriodRateCapStrikePricePercentage
Namespace Prefix: | abr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | abr_FinancingReceivableModificationsRefinancingAndOrExtensionsMadeConsideredTroubleDebtRestructuringNumberOfLoans
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modified In Period, Accrual Rate, Basis Spread On Variable Rate + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedInPeriodAccrualRateBasisSpreadOnVariableRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modified in Period, Amount, Not Pursuant To Contract + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedInPeriodAmountNotPursuantToContract
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Modified In Period, Weighted Average Accrual Rate + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedInPeriodWeightedAverageAccrualRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modified, Pay Rate of Interest + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedPayRateOfInterest
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Modified, Percent Of Deferred Interest Waived If Paid Off By Extended Maturity Date + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedPercentOfDeferredInterestWaivedIfPaidOffByExtendedMaturityDate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of interest foregone. + References No definition available. + Details
Name: | abr_FinancingReceivableModifiedPercentageOfInterestDeferred
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Specific Reserve + References No definition available. + Details
Name: | abr_FinancingReceivableSpecificReserve
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Specifically Impaired Loans + References No definition available. + Details
Name: | abr_FinancingReceivableSpecificallyImpairedLoans
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Total Fixed Rate + References No definition available. + Details
Name: | abr_FinancingReceivableTotalFixedRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Total Fixed Rate, Period + References No definition available. + Details
Name: | abr_FinancingReceivableTotalFixedRatePeriod
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Total Specific Reserve + References No definition available. + Details
Name: | abr_FinancingReceivableTotalSpecificReserve
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date pertaining to interest reserve funded to cover debt service costs, based on contractual requirements. + References No definition available. + Details
Name: | abr_InterestReserve
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Mortgage Loans On Real Estate, Weighted Average Pay Rate + References No definition available. + Details
Name: | abr_MortgageLoansOnRealEstateWeightedAveragePayRate
Namespace Prefix: | abr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Financing Receivables Modified During Period + References No definition available. + Details
Name: | abr_NumberOfFinancingReceivablesModifiedDuringPeriod
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Financing Receivables Modified During Period, Not Pursuant To Contract + References No definition available. + Details
Name: | abr_NumberOfFinancingReceivablesModifiedDuringPeriodNotPursuantToContract
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Financing Receivables With Extended Maturities + References No definition available. + Details
Name: | abr_NumberOfFinancingReceivablesWithExtendedMaturities
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class. + References No definition available. + Details
Name: | abr_NumberOfImpairedLoansByAssetClass
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A + Details
Name: | us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481746/310-40-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 36 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-36 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=abr_SubordinatedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LienCategoryAxis=us-gaap_SeniorLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=abr_SeniorPositionLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=abr_FinancialAssetGreaterThan60DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=abr_FinancialAsset60DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturitySixLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=abr_FinancialAssetLessThan60DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefThreeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefFiveLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_BridgeLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_LoanReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturitySixteenLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturityOneLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturityTwoLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturityThirteenLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefAndExtendedMaturityFourteenLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_LoanModificationExtendedMaturityTwelveLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_TemporaryInterestRateReliefTwentyThreeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_LoanModificationExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_RateOfInterestAndExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=abr_InterestDeferralExtendedMaturityAndInterestForgivenessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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