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SCHEDULE IV - LOANS AND OTHER LENDING INVESTMENTS, Loans and Investments Carrying Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of the Company's loans and investments carrying amounts |  |  |
Balance at beginning of year | $ 3,200,145 | $ 2,579,127 | $ 1,695,732
Additions during period: |  |  |
New loan originations | 2,831,822 | 1,658,732 | 1,842,974
Loan charge-offs |  | 3,173 | 20,473
Funding of unfunded loan commitments | 65,531 | 21,027 | 51,689
Accretion of unearned revenue | 12,083 | 9,278 | 6,519
Recoveries of reserves |  | 2,527 | 2,456
Deductions during period: |  |  |
Loan payoffs and paydowns | (1,753,693) | (957,163) | (929,796)
Unfunded loan commitments | (147,392) | (88,617) | (77,233)
Use of loan charge-offs |  | (3,173) | (20,473)
Provision for loan losses |  | (13,986) | (2,000)
Unearned revenue and costs | (18,536) | (10,780) | (11,214)
Balance at end of year | $ 4,189,960 | $ 3,200,145 | $ 2,579,127

X
- Definition The amount of additions to mortgage loans due to loan charge-offs during the reporting period. + References No definition available. + Details
Name: | abr_AllowanceForLoanLossTotalChargeOffs
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Balance Type: | debit
Period Type: | duration

X
- Definition The carrying value of loans derived after deducting unearned revenue and other holdbacks. + References No definition available. + Details
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X
- Definition The amount of additions to mortgage loans due to accretion of unearned revenue during the reporting period. + References No definition available. + Details
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- Definition The amount of additions to mortgage loans due to funding of unfunded loan commitments during the reporting period. + References No definition available. + Details
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- Definition The amount of reductions of mortgage loans due to unearned revenue and costs, during the reporting period. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The amount of unfunded loan commitments on real estate during the reporting period. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The amount of reductions of mortgage loans due to use of loan charge-offs, during the reporting period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Represents the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses. + References No definition available. + Details
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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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X
- Definition Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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