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v3.19.3.a.u2

Loans and Investments, Interest Reserves (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) loan
Loans and Investments |  |
Interest reserve held | $ 37,000,000 | $ 48,900,000
Number of loans covered under interest reserve | 131 | 110
Aggregate UPB covered under interest reserve | $ 2,430,000,000 | $ 2,220,000,000

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 Number of loans covered under the interest reserve fund. + References No definition available. + Details
Name: | abr_InterestReserveNumberOfLoans
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of aggregate unpaid principal balance covered under the interest reserve fund. + References No definition available. + Details
Name: | abr_InterestReserveUnpaidPrincipalBalance
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | abr_LoansAndInvestmentsAbstract
Namespace Prefix: | abr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration