XML 56 R46.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans and Investments - Risk Ratings and LTV Ratios (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loans and Investments |  |
Loans and investments, gross | $ 11,565,538 | $ 12,615,006
Percentage of Portfolio | 100.00% | 100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 2.00% |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 80.00% |
Charge-offs, Year One | $ 1,722 | $ 0
Charge-offs, Year Two | 0 | 0
Charge-offs, Year Three | 2,750 | 0
Charge-offs, Year Four | 5,488 | 0
Charge-offs, Year Five | 0 | 0
Charge-offs, prior years | 0 | 5,700
Charge-offs, Total | 9,960 | 5,700
Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 828,127 | 752,918
Origination Year Two | 891,471 | 5,324,481
Origination Year Three | 4,507,256 | 5,581,489
Origination Year Four | 4,618,900 | 488,628
Origination Year Five | 306,701 | 239,648
Origination, Prior Years | 413,083 | 227,842
Loans and investments, gross | $ 11,565,538 | $ 12,615,006
Wtd. Avg. First Dollar LTV Ratio (as percent) | 2.00% | 1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 80.00% | 78.00%
Multifamily | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 277,081 | $ 422,596
Origination Year Two | 442,679 | 4,813,671
Origination Year Three | 4,030,480 | 5,217,946
Origination Year Four | 4,425,124 | 325,426
Origination Year Five | 136,670 | 239,648
Origination, Prior Years | 263,935 | 78,694
Loans and investments, gross | $ 9,575,969 | $ 11,097,981
Percentage of Portfolio | 83.00% | 88.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 2.00% | 1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 83.00% | 80.00%
Multifamily | Pass | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 59,347 | $ 80,814
Origination Year Two | 75,239 | 53,316
Origination Year Three | 18,600 | 26,185
Origination Year Four | 9,346 | 2,010
Origination Year Five | 2,010 | 4,598
Origination, Prior Years | 24,841 | 20,300
Loans and investments, gross | 189,383 | 187,223
Multifamily | Pass/Watch | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 73,598 | 317,358
Origination Year Two | 343,325 | 2,561,938
Origination Year Three | 1,322,118 | 2,223,155
Origination Year Four | 862,048 | 119,860
Origination Year Five | 119,860 | 84,600
Origination, Prior Years | 113,100 | 58,044
Loans and investments, gross | 2,834,049 | 5,364,955
Multifamily | Special Mention | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 123,276 | 24,424
Origination Year Two | 23,457 | 1,762,539
Origination Year Three | 2,262,487 | 2,631,689
Origination Year Four | 3,279,171 | 180,750
Origination Year Five | 0 | 140,685
Origination, Prior Years | 109,385 | 350
Loans and investments, gross | 5,797,776 | 4,740,437
Multifamily | Substandard | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 658 | 435,878
Origination Year Three | 365,687 | 322,987
Origination Year Four | 178,775 | 8,006
Origination Year Five | 0 | 0
Origination, Prior Years | 6,844 | 0
Loans and investments, gross | 551,964 | 766,871
Multifamily | Doubtful | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 20,860 | 0
Origination Year Two | 0 | 0
Origination Year Three | 61,588 | 13,930
Origination Year Four | 95,784 | 14,800
Origination Year Five | 14,800 | 9,765
Origination, Prior Years | 9,765 | 0
Loans and investments, gross | 202,797 | 38,495
Single-Family Rental | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 540,696 | 330,322
Origination Year Two | 448,792 | 510,810
Origination Year Three | 476,776 | 363,543
Origination Year Four | 193,776 | 119,692
Origination Year Five | 126,521 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | $ 1,786,561 | $ 1,324,367
Percentage of Portfolio | 15.00% | 10.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 61.00% | 62.00%
Single-Family Rental | Pass | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 107,355 | $ 9,709
Origination Year Two | 20,834 | 608
Origination Year Three | 7,052 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | 135,241 | 10,317
Single-Family Rental | Pass/Watch | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 427,637 | 289,482
Origination Year Two | 369,009 | 465,057
Origination Year Three | 361,725 | 144,846
Origination Year Four | 109,454 | 119,692
Origination Year Five | 37,303 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | 1,305,128 | 1,019,077
Single-Family Rental | Special Mention | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 5,704 | 31,131
Origination Year Two | 58,949 | 45,145
Origination Year Three | 107,999 | 218,697
Origination Year Four | 84,322 | 0
Origination Year Five | 89,218 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | 346,192 | 294,973
Land | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 10,350 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 8,100
Origination Year Five | 8,100 | 0
Origination, Prior Years | 127,928 | 127,928
Loans and investments, gross | $ 146,378 | $ 136,028
Percentage of Portfolio | 1.00% | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 96.00% | 97.00%
Land | Pass | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 10,350 |
Origination Year Two | 0 |
Origination Year Three | 0 |
Origination Year Four | 0 |
Origination Year Five | 0 |
Origination, Prior Years | 0 |
Loans and investments, gross | 10,350 |
Land | Pass/Watch | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One |  | $ 0
Origination Year Two |  | 0
Origination Year Three |  | 0
Origination Year Four |  | 4,600
Origination Year Five |  | 0
Origination, Prior Years |  | 0
Loans and investments, gross |  | 4,600
Land | Special Mention | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 3,500
Origination Year Five | 8,100 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | 8,100 | 3,500
Land | Substandard | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 127,928 | 127,928
Loans and investments, gross | 127,928 | 127,928
Office | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 35,410
Origination Year Five | 35,410 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | $ 35,410 | $ 35,410
Percentage of Portfolio | 1.00% | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 94.00% | 80.00%
Office | Special Mention | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 0 | $ 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 35,410
Origination Year Five | 35,410 | 0
Origination, Prior Years | 0 | 0
Loans and investments, gross | 35,410 | 35,410
Retail | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 19,520 | 19,520
Loans and investments, gross | $ 19,520 | $ 19,520
Percentage of Portfolio | 1.00% | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 88.00% | 88.00%
Retail | Substandard | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 0 | $ 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 19,520 | 19,520
Loans and investments, gross | 19,520 | 19,520
Commercial | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | 0 | 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 1,700 | 1,700
Loans and investments, gross | $ 1,700 | $ 1,700
Percentage of Portfolio | 1.00% | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 63.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 100.00% | 66.00%
Commercial | Doubtful | Credit risk concentration |  |
Loans and Investments |  |
Origination Year One | $ 0 | $ 0
Origination Year Two | 0 | 0
Origination Year Three | 0 | 0
Origination Year Four | 0 | 0
Origination Year Five | 0 | 0
Origination, Prior Years | 1,700 | 1,700
Loans and investments, gross | $ 1,700 | $ 1,700

X
- Definition Represents the weighted average First Dollar LTV Ratio that is calculated by comparing the total of the company's senior most dollar and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will absorb a total loss of its position. + References No definition available. + Details
Name: | abr_FirstDollarLTVRatio
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will initially absorb a loss. + References No definition available. + Details
Name: | abr_LastDollarLTVRatio
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents a category of loans on real estate expressed as a percentage of total loans on real estate. + References No definition available. + Details
Name: | abr_MortgageLoansOnRealEstatePercentage
Namespace Prefix: | abr_
Data Type: | dtr-types1: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/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
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: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=abr_PassWatchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_LandAndLandImprovementsMember
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: |

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

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