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Debt Obligations - Collateralized Loan Obligations (Details) |  |  | 1 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) tranche item | Jun. 30, 2021 USD ($) item tranche | Feb. 28, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) item tranche | Dec. 31, 2021 USD ($) tranche item | Dec. 31, 2020 USD ($) tranche item | Dec. 31, 2019 USD ($) tranche item | Dec. 31, 2018 USD ($) tranche item
Debt Obligations |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations |  |  |  |  |  |  | $ 4,281,512,000 | $ 668,000,000 | $ 1,067,193,000 |
Debt, Carrying Value |  |  |  |  |  |  | $ 5,892,810,000 | $ 2,517,309,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 2.21% | 2.20% |  |
Payoffs and paydowns of collateralized loan obligations |  |  |  |  |  |  | $ 889,150,000 | $ 283,125,000 | $ 529,250,000 |
UPB |  |  |  |  |  |  | 4,493,699,000 | 2,238,722,000 |  |
Collateralized loan obligations |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  | 5,924,705,000 | 2,532,343,000 |  |
Debt, Carrying Value |  |  |  |  |  |  | $ 5,892,810,000 | $ 2,517,309,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.59% | 1.60% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 6,645,088,000 | $ 2,932,791,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 6,616,810,000 | 2,923,634,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 329,496,000 | 138,683,000 |  |
Deferred financing fees |  |  |  |  |  |  | $ 31,900,000 | $ 15,000,000.0 |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  | 1.86% | 1.93% |  |
Collateral at risk |  |  |  |  |  |  | $ 0 | $ 0 |  |
CLO 18 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  | $ 2,050,000,000.00 |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  | 397,200,000 |  |  |  |  |  |  |
CLO 18 | Investment grade | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  | 1,650,000,000 |  |  |  |  |  |  |
CLO 18 | Below investment grade | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  | $ 210,100,000 |  |  |  |  |  |  |
CLO 17 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  |  | 8 |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  |  | 2 |  |  |
Value of the tranches issued |  |  |  |  |  |  | $ 1,910,000,000 |  |  |
Debt, Face Value |  |  |  |  |  |  | 1,714,125,000 |  |  |
Debt, Carrying Value |  |  |  |  |  |  | $ 1,705,549,000 |  |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.81% |  |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 1,914,280,000 |  |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 1,903,997,000 |  |  |
Cash, Restricted Cash |  |  |  |  |  |  | $ 118,520,000 |  |  |
Replacement period |  |  |  |  |  |  | 2 years 6 months |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  |  | $ 315,000,000.0 |  |  |
Maximum period to acquire additional loan obligations |  |  |  |  |  |  | 180 days |  |  |
Notional amount of residual interest retained |  |  |  |  |  |  | $ 385,900,000 |  |  |
Value of portfolio loans as collateral |  |  |  |  |  |  | 1,790,000,000 |  |  |
Face value of loan obligations will be owned by the issuer |  |  |  |  |  |  | $ 2,100,000,000 |  |  |
Leverage (as a percent) |  |  |  |  |  |  | 82.00% |  |  |
UPB |  |  |  |  |  |  | $ 194,300,000 |  |  |
CLO 17 | One-month LIBOR |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  | 1.68% |  |  |
CLO 17 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  |  | $ 194,300,000 |  |  |
CLO 16 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche | 8 |  |  |  |  |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item | 2 |  |  |  |  |  |  |  |  |
Value of the tranches issued | $ 1,370,000,000 |  |  | $ 1,370,000,000 |  |  |  |  |  |
Debt, Face Value | 1,240,000,000 |  |  | 1,240,000,000 |  |  | 1,237,500,000 |  |  |
Debt, Carrying Value | $ 135,000,000.0 |  |  | $ 135,000,000.0 |  |  | $ 1,230,093,000 |  |  |
Weighted average note rate (as a percent) | 1.31% |  |  | 1.31% |  |  | 1.44% |  |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 1,444,573,000 |  |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 1,436,743,000 |  |  |
Replacement period |  |  |  | 2 years 6 months |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations | $ 313,000,000.0 |  |  |  |  |  |  |  |  |
Maximum period to acquire additional loan obligations | 180 days |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained | $ 262,500,000 |  |  | $ 262,500,000 |  |  |  |  |  |
Value of portfolio loans as collateral | 1,190,000,000 |  |  | 1,190,000,000 |  |  |  |  |  |
Face value of loan obligations will be owned by the issuer | $ 1,500,000,000 |  |  | $ 1,500,000,000 |  |  |  |  |  |
Leverage (as a percent) | 83.00% |  |  | 83.00% |  |  |  |  |  |
CLO 16 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained | $ 135,000,000.0 |  |  | $ 135,000,000.0 |  |  |  |  |  |
CLO 15 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  | 8 |  |  |  |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  | 2 |  |  |  |  |  |  |  |
Value of the tranches issued |  | $ 747,800,000 |  |  | $ 747,800,000 |  |  |  |  |
Debt, Face Value |  | 674,400,000 |  |  | 674,400,000 |  | 674,412,000 |  |  |
Debt, Carrying Value |  | 73,400,000 |  |  | $ 73,400,000 |  | $ 669,723,000 |  |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.49% |  |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 785,761,000 |  |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 782,682,000 |  |  |
Cash, Restricted Cash |  |  |  |  |  |  | 15,750,000 |  |  |
Replacement period |  |  |  |  | 2 years 6 months |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  | $ 162,000,000.0 |  |  |  |  |  |  |  |
Maximum period to acquire additional loan obligations |  | 180 days |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  | $ 140,600,000 |  |  | $ 140,600,000 |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  | 1.37% |  |  | 1.37% |  |  |  |  |
Value of portfolio loans as collateral |  | $ 653,000,000.0 |  |  | $ 653,000,000.0 |  |  |  |  |
Face value of loan obligations will be owned by the issuer |  | $ 815,000,000.0 |  |  | $ 815,000,000.0 |  |  |  |  |
Leverage (as a percent) |  | 83.00% |  |  | 83.00% |  |  |  |  |
CLO 15 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  | $ 73,400,000 |  |  | $ 73,400,000 |  |  |  |  |
CLO 14 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  | 8 |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  | 2 |  |  |  |
Value of the tranches issued |  |  |  |  |  | $ 724,200,000 |  |  |  |
Debt, Face Value |  |  |  |  |  | 655,500,000 | 655,475,000 |  |  |
Debt, Carrying Value |  |  |  |  |  | $ 68,700,000 | $ 650,947,000 |  |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.45% |  |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 717,396,000 |  |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 715,154,000 |  |  |
Cash, Restricted Cash |  |  |  |  |  |  | 53,342,000 |  |  |
Replacement period |  |  |  |  |  | 2 years 6 months |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  | $ 149,800,000 |  |  |  |
Maximum period to acquire additional loan obligations |  |  |  |  |  | 180 days |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  | $ 129,500,000 |  |  |  |
Value of portfolio loans as collateral |  |  |  |  |  | 635,200,000 |  |  |  |
Face value of loan obligations will be owned by the issuer |  |  |  |  |  | $ 785,000,000.0 |  |  |  |
Leverage (as a percent) |  |  |  |  |  | 84.00% |  |  |  |
CLO 14 | One-month LIBOR |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  | 1.33% |  |  |  |
CLO 14 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  | $ 68,700,000 |  |  |  |
CLO 13 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  |  |  | 8 |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  |  |  | 2 |  |
Value of the tranches issued |  |  |  |  |  |  |  | $ 738,000,000.0 |  |
Debt, Face Value |  |  |  |  |  |  | 668,000,000 | 668,000,000 |  |
Debt, Carrying Value |  |  |  |  |  |  | $ 665,006,000 | $ 663,804,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.54% | 1.58% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 740,369,000 | $ 768,664,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 738,265,000 | 765,923,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 48,543,000 | $ 43,000 |  |
Replacement period |  |  |  |  |  |  |  | 3 years |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  |  |  | $ 159,500,000 |  |
Maximum period to acquire additional loan obligations |  |  |  |  |  |  |  | 180 days |  |
Notional amount of residual interest retained |  |  |  |  |  |  |  | $ 132,000,000.0 |  |
Value of portfolio loans as collateral |  |  |  |  |  |  |  | 640,500,000 |  |
Face value of loan obligations will be owned by the issuer |  |  |  |  |  |  |  | $ 800,000,000.0 |  |
Leverage (as a percent) |  |  |  |  |  |  |  | 84.00% |  |
UPB |  |  |  |  |  |  |  | $ 70,000,000.0 |  |
CLO 13 | One-month LIBOR |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  |  | 1.41% |  |
CLO 13 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  |  |  | $ 70,000,000.0 |  |
CLO 12 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  |  |  |  | 8 |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  |  |  |  | 2 |
Proceeds from issuance of collateralized loan obligations |  |  |  |  |  |  |  |  | $ 124,100,000 |
Value of the tranches issued |  |  |  |  |  |  |  |  | 585,800,000 |
Debt, Face Value |  |  |  |  |  |  | 534,193,000 | 534,193,000 | 534,200,000 |
Debt, Carrying Value |  |  |  |  |  |  | $ 531,939,000 | $ 530,673,000 | $ 51,600,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.62% | 1.66% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 557,249,000 | $ 628,935,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 555,974,000 | 627,262,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 35,635,000 | 2,005,000 |  |
Replacement period |  |  |  |  |  |  |  |  | 3 years |
Maximum period to acquire additional loan obligations |  |  |  |  |  |  |  |  | 180 days |
Notional amount of residual interest retained |  |  |  |  |  |  |  |  | $ 100,800,000 |
Value of portfolio loans as collateral |  |  |  |  |  |  |  |  | 510,900,000 |
Face value of loan obligations will be owned by the issuer |  |  |  |  |  |  |  |  | $ 635,000,000.0 |
Leverage (as a percent) |  |  |  |  |  |  |  |  | 84.00% |
CLO 12 | One-month LIBOR |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  |  |  | 1.50% |
CLO 12 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  |  |  |  | $ 51,600,000 |
CLO 11 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  |  | 533,000,000 |  |
Debt, Carrying Value |  |  |  |  |  |  |  | $ 529,859,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  |  | 1.61% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  |  | $ 555,157,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  |  | 553,286,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  |  | 92,395,000 |  |
CLO 10 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  |  |  |  |  | 7
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  |  |  |  |  | 2
Proceeds from issuance of collateralized loan obligations |  |  |  |  |  |  |  |  |  | $ 58,100,000
Value of the tranches issued |  |  |  |  |  |  |  |  |  | 494,200,000
Debt, Face Value |  |  |  |  |  |  | 441,000,000 | 441,000,000 |  | 441,000,000.0
Debt, Carrying Value |  |  |  |  |  |  | $ 439,553,000 | $ 438,442,000 |  | $ 53,200,000
Weighted average note rate (as a percent) |  |  |  |  |  |  | 1.57% | 1.61% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 485,460,000 | $ 522,132,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 483,995,000 | 520,507,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 57,706,000 | 25,537,000 |  |
Replacement period |  |  |  |  |  |  |  |  |  | 4 years
Maximum period to acquire additional loan obligations |  |  |  |  |  |  |  |  |  | 120 days
Notional amount of residual interest retained |  |  |  |  |  |  |  |  |  | $ 119,000,000.0
Value of portfolio loans as collateral |  |  |  |  |  |  |  |  |  | 501,900,000
Face value of loan obligations will be owned by the issuer |  |  |  |  |  |  |  |  |  | $ 560,000,000.0
Leverage (as a percent) |  |  |  |  |  |  |  |  |  | 79.00%
CLO 10 | One-month LIBOR |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  |  |  |  | 1.45%
CLO 10 | Below investment grade |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Notional amount of residual interest retained |  |  |  |  |  |  |  |  |  | $ 53,200,000
CLO 9 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  |  | 356,150,000 |  |
Debt, Carrying Value |  |  |  |  |  |  |  | $ 354,531,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  |  | 1.53% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  |  | $ 457,903,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  |  | 456,656,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  |  | 18,703,000 |  |
CLO 11 and CLO 9 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Value |  |  |  |  |  |  | 889,200,000 |  |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  | 3,400,000 |  |  |
CLO 8 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Value |  |  |  |  |  |  |  | 282,900,000 |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  |  | 1,500,000 |  |
CLO 7 and CLO 6 |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Value |  |  |  |  |  |  |  |  | 529,300,000 |
Deferred fees expensed as interest expense |  |  |  |  |  |  |  |  | $ 2,600,000 |
CLO VII |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  |  | $ 133,700,000 | $ 49,500,000 |  |

X
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X
- Definition Represents the face value of collateral in default, as defined by the CDO indenture, as well as assets deemed to be a credit risk. Credit risk assets are reported by each of the CDOs and are generally defined as the one that, in the CDO collateral manager's reasonable business judgment, has a significant risk of declining in credit quality or, with a passage of time, becoming a defaulted asset. + References No definition available. + Details
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- Definition Face (par) amount of tranches issued to fund a collateralized securitization vehicle. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the replacement period of financing that allows the principal proceeds and sale proceeds (if any) of the loan obligations to be reinvested in qualifying replacement loan obligations. + References No definition available. + Details
Name: | abr_DebtInstrumentFinancingReplacementPeriod
Namespace Prefix: | abr_
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- Definition Represents information pertaining to redemption value of debt instrument. + References No definition available. + Details
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Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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