XML 121 R107.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Agreements and Transactions with Related Parties - Other Related Party (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Jan. 31, 2024 | May 31, 2023 USD ($) officer | Apr. 30, 2023 USD ($) | Jul. 31, 2022 USD ($) | Apr. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) property | Jan. 31, 2019 USD ($) | Jun. 30, 2023 | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) loan property | Dec. 31, 2017 USD ($) property loan | Dec. 31, 2016 | Dec. 31, 2015 USD ($) | Nov. 30, 2023 USD ($) | Feb. 28, 2022 USD ($)
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | $ 1,331,219 | $ 948,401 | $ 466,087 |  |  |  |  |  |  |  |
Investment made |  |  |  |  |  |  |  |  |  |  | 1,362,171 | 5,955,061 | 9,209,475 |  |  |  |  |  |  |  |
Income from equity affiliates |  |  |  |  |  |  |  |  |  |  | 24,281 | 14,247 | 34,567 |  |  |  |  |  |  |  |
Servicing revenue |  |  |  |  |  |  |  |  |  |  | $ 193,542 | 152,068 | 133,429 |  |  |  |  |  |  |  |
Indirect ownership percentage |  |  |  |  |  |  |  |  |  |  | 9.20% |  |  |  |  |  |  |  |  |  |
Paydowns of principal made by borrower |  |  |  |  |  |  |  |  |  |  | $ 3,354,055 | 3,818,554 | 2,516,771 |  |  |  |  |  |  |  |
Lexford Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution received |  |  |  |  |  |  |  |  |  |  | 12,200 | 11,100 |  |  |  |  |  |  |  |  |
Mezzanine Loans | Other Related Party Transactions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension of maturity date (in years) |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bridge Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |
Bridge loan, six multifamily properties | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UPB converted to a mezzanine loan |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested |  |  |  |  |  |  | $ 4,200 |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |
Income from equity affiliates |  |  |  |  |  |  |  |  |  |  | 12,200 | 11,100 |  |  |  |  |  |  |  |  |
Maximum exposure under guaranty |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |
Related Party | Other Related Party Transactions | LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 49.30% |  |  |  |  |  | 49.30% |  |  |  |  |  |  |  |
Related Party | Other Related Party Transactions | AMAC III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 3,100 | 1,900 | $ 1,300 |  |  |  |  |  |  |  |
Amount invested |  |  |  |  |  |  |  |  |  |  | 25,900 |  |  |  | $ 30,000 |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |  |  |
Income from equity affiliates |  |  |  |  |  |  |  |  |  |  | 1,900 | 2,400 | 1,300 |  |  |  |  |  |  |  |
Distribution received |  |  |  |  |  |  |  |  |  |  | $ 1,100 | 500 |  |  |  |  |  |  |  |  |
Related Party | Other Related Party Transactions | Lexford Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, percentage of gross revenues of underlying properties |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |  |
Related Party | CMBS/Conduit | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans assumed |  |  |  |  |  |  | $ 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Residential mortgage banking business | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from equity affiliates |  |  |  |  |  |  |  |  |  |  | $ 600 | 4,900 | 34,600 |  |  |  |  |  |  |  |
Acquisition purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,600 |  |
Noncontrolling interest in equity method investment acquired (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Indirect ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.30% |  |
Related Party | ACM Acquisition | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution received |  |  |  |  |  |  |  |  |  |  | $ 15,000 | 23,800 |  |  |  |  |  |  |  |  |
Number of shares held by related party (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 2,535,870 |  |  |  |  |  |  |  |  |  |
OP units hold as part of acquisition (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 10,615,085 |  |  |  |  |  |  |  |  |  |
Aggregate percentage of voting power held by related party |  |  |  |  |  |  |  |  |  |  | 6.40% |  |  |  |  |  |  |  |  |  |
Related Party | Retail property | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property purchased |  |  |  |  |  |  | $ 32,500 |  |  |  |  |  | 32,500 |  |  |  |  |  |  |  |
Related Party | Multifamily | Fannie Mae Mortgage | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,900 |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.60% |  |  |  |
Percentage of maximum loss-sharing obligation unpaid principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Servicing revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Related Party | Maturity date of March 2025 | Secured Overnight Financing Rate (SOFR) | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mature date of April 2030 | Multifamily | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned | property |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 2 |  |  |  |  |  |  |
Related Party | Maturity Date Of June 2021 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Related Party | Maturity date of March 2030 | Private Label | Other Related Party Transactions | Lexford Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,600 |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |
Related Party | Preferred equity investments | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Related Party | Preferred equity investments | Single- Family Rental | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment made |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600 |  |  |  |  |  |  |
Related Party | Preferred equity investments | Matures in April 2023 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |
Related Party | Preferred equity investments | Maturity date of September 2019 | Multifamily | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |  | $ 3,400 |  |  |  |  |  |  |
Related Party | Mezzanine Loans | Other Related Party Transactions | AMAC III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |
Related Party | Mezzanine Loans | Single- Family Rental | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 300 | 300 | 300 |  |  |  |  |  |  |  |
Related Party | Mezzanine Loans | Mature date of April 2030 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |
Related Party | Bridge Loans | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | 35,000 |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  |  |  | 18.90% |  |  |  |  |  | 18.90% |  |  |  |  |  |  |
Related Party | Bridge Loans | Other Related Party Transactions | AMAC III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 |  |  |  |  |  |
Related Party | Bridge Loans | Single- Family Rental | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan committed |  |  |  |  |  |  |  | $ 32,500 |  |  | 31,400 |  |  | $ 30,500 |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |
Investment made |  |  |  |  |  |  |  | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Loan committed upsized |  |  |  | $ 38,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,900 |
Related Party | Bridge Loans | Matures in December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Matures in December 2025 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | 56,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan committed |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers | officer |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Matures in December 2025 | Secured Overnight Financing Rate (SOFR) | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2025 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 46,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,400
Loan committed |  |  |  |  | $ 6,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 400 | 100 |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2025 | Secured Overnight Financing Rate (SOFR) | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2025 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25%
Base spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00%
Related Party | Bridge Loans | Maturity date of May 2025 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 67,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan committed |  |  |  |  |  | $ 9,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 200 | 100 |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of May 2025 | Secured Overnight Financing Rate (SOFR) | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  | 4.63% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2024 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan committed |  |  |  |  |  |  |  |  |  |  |  |  | 63,400 |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 5,600 | 3,700 | $ 2,100 |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity date of March 2024 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  | 3.75% |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Matures in May 2023 | Secured Overnight Financing Rate (SOFR) | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Matures in May 2023 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  | 5.50% |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Amount invested |  |  |  |  |  |  |  |  |  |  | 36,300 |  |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Matures in April 2023 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 3,600 |  | $ 600 |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Mature date of April 2030 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |
Related Party | Bridge Loans | Maturity Date Of June 2021 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | 280,500 |  |  |  |  |  |  |  |  |  |
Number of bridge loans originated | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |
Number of multifamily properties renovated | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72 |  |  |  |  |
Related Party | Bridge Loans | Maturity Date Of June 2021 | Other Related Party Transactions | Lexford Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Paydowns of principal made by borrower |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |
Related Party | Bridge loan, one multifamily property | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,700 |  |  |  |  |
Related Party | Bridge loan, one multifamily property | Mature date of April 2030 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 35,400 |  |  |  |  |  | $ 35,400 |  |  |  |  |  |  |
Related Party | Bridge loan, one multifamily property | Mature date of April 2030 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |
Related Party | Bridge loan, several multifamily properties | Maturity Date Of June 2021 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | $ 2,200 | 1,400 | 1,300 |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Related Party | Bridge loan, two multifamily properties | Mature date of April 2030 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 14,800 |  |  |  |  |  | $ 14,800 |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of fourth quarter 2020 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,000 |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |
Number of properties owned | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of mortgage loans secured by property purchased from related party | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of fourth quarter 2020 | Minimum | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.24% |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of fourth quarter 2020 | Maximum | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.54% |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2021 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 31,100 |  |  |  |  |  | $ 31,100 |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of October 2021 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Related Party | Bridge loan, two multifamily properties | Maturity date of 2020 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 800 |  |  |  |  |  |  |  |  |
Related Party | Ginkgo Investment Company LLC | Fannie Mae Mortgage | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of maximum loss-sharing obligation unpaid principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Servicing revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Loan purchased a multifamily apartment complex which assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,300 |  |  |  |
Percentage of ownership after transaction |  |  |  |  |  |  |  |  |  |  | 3.60% |  |  |  |  |  |  |  |  |  |
Percentage of loan assumption fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Immediate Family Member of Management or Principal Owner | Other Related Party Transactions | LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 10.00% |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Maturity date of March 2025 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Matures in October 2023 | Preferred equity interest financing agreement | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | $ 2,800 | 1,300 |  |  |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Preferred equity investments | Matures in October 2023 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Bridge Loans | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  |  |  | 21.80% |  |  |  |  |  | 21.80% |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Bridge Loans | Matures in October 2023 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Immediate Family Member of Management or Principal Owner | Bridge Loans | Matures in October 2023 | LIBOR | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base spread (as a percent) |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  | 5.50% |  |  |  |  |  |  |
LIBOR floor (as a percentage) |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Director | Ginkgo Investment Company LLC | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of managing member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |
Chief Executive Officer | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of our former Manager's outstanding membership interest of related party in another related party |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |
Chief Executive Officer | Chief Executive Officer | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest limit of our common stock under company charter (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Chief Executive Officer | Mezzanine Loans | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Chief Executive Officer | Bridge loan, six multifamily properties | Maturity date of September 2019 | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | $ 200 | $ 200 | $ 200 |  |  |  |  |  |  |  |
Chief Executive Officer | Bridge loan, six multifamily properties | Maturity date of September 2019 | Minimum | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |
Chief Executive Officer | Bridge loan, six multifamily properties | Maturity date of September 2019 | Maximum | Other Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |

X
- Definition Numbers of operating partnership units issued or issuable in consideration for the business combination. + References No definition available. + Details
Name: | abr_BusinessCombinationConsiderationStockOperatingPartnerUnits
Namespace Prefix: | abr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of mortgage loans converted to mezzanine loans during the reporting period. + References No definition available. + Details
Name: | abr_ConversionOfMortgageLoansToMezzanineLoans
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Length of the extension period of the debt instrument. + References No definition available. + Details
Name: | abr_DebtInstrumentMaturityDateLengthOfExtensionPeriod
Namespace Prefix: | abr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to the percentage of indirect ownership in a business. + References No definition available. + Details
Name: | abr_EquityMethodIndirectOwnershipPercentage
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of noncontrolling interest in the equity method investment acquired by the entity. + References No definition available. + Details
Name: | abr_EquityMethodInvestmentNoncontrollingInterestAcquired
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum variable interest rate for loans receivable. + References No definition available. + Details
Name: | abr_LoansReceivableFloorInterestRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the fixed interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References No definition available. + Details
Name: | abr_MortgageLoansOnRealEstateFixedInterestRate
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of multifamily properties renovated. + References No definition available. + Details
Name: | abr_NumberOfMultifamilyPropertiesRenovated
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Officers + References No definition available. + Details
Name: | abr_NumberOfOfficers
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum percentage of ownership interest of the Company's common stock allowed under the company's charter. + References No definition available. + Details
Name: | abr_OwnershipPercentageLimit
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the cash outflow during the reporting period in respect of payments for loans and investments funded and purchased by the reporting entity. + References No definition available. + Details
Name: | abr_PaymentForLoansAndInvestmentsFundedOriginatedAndPurchasedNet
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Payments To Purchase Property. + References No definition available. + Details
Name: | abr_PaymentsToPurchaseProperty
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of equity participation interest. + References No definition available. + Details
Name: | abr_PercentageOfEquityParticipationInterest
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represent information pertaining to percentage of loan assumption fee. + References No definition available. + Details
Name: | abr_PercentageOfLoanAssumptionFee
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to percentage of maximum loss-sharing obligation unpaid principal balance. + References No definition available. + Details
Name: | abr_PercentageOfMaximumLossSharingObligationOfUnpaidPrincipalBalance
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of outstanding membership interest of a related party in another related party. + References No definition available. + Details
Name: | abr_PercentageOfOwnershipOfRelatedPartyInOtherRelatedParty
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum amount the entity agreed to fund under the related party commitment. + References No definition available. + Details
Name: | abr_RelatedPartyLoanCommitmentAmount
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percentage of ownership of common stock or equity participation owned by related party. + References No definition available. + Details
Name: | abr_RelatedPartyOwnershipPercentage
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information pertaining to related party, percentage of management. + References No definition available. + Details
Name: | abr_RelatedPartyPercentageInManagement
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of bridge loan originated with relevant mortgage property owned by related parties. + References No definition available. + Details
Name: | abr_RelatedPartyTransactionNumberOfBridgeLoansOriginated
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of mortgage loans secured by property purchased from the related party. + References No definition available. + Details
Name: | abr_RelatedPartyTransactionNumberOfMortgageLoansSecuredByPropertyPurchasedFromRelatedParty
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of voting power held by a related party. + References No definition available. + Details
Name: | abr_RelatedPartyTransactionPercentageOfOwnership
Namespace Prefix: | abr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of common shares held by a related party. + References No definition available. + Details
Name: | abr_RelatedPartyTransactionSharesHeldByRelatedParty
Namespace Prefix: | abr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The upsized amount the entity agreed to fund under the related party commitment. + References No definition available. + Details
Name: | abr_RelatedPartyUpsizedLoanCommitmentAmount
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Footnote 6 -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(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of contractual principal due at origination of mortgage loan within 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column F -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(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479581/805-30-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479637/805-30-30-7 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
Name: | us-gaap_ContractuallySpecifiedServicingFeesAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_EquityMethodInvestmentAggregateCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 21D -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-21D Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_EquityMethodInvestmentDividendsOrDistributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of income (loss) for proportionate share of equity method investee's income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 45 -Paragraph 39 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480228/946-830-45-39 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)(Footnote 6)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_InterestIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The fair value of loans assumed in noncash investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
Name: | us-gaap_LoansAssumed1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage added to reference rate used to compute variable rate on loan receivable. + References No definition available. + Details
Name: | us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 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_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage charged for managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeePercentFee
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_UnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_LexfordPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=abr_OtherRelatedPartyTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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_FinancingReceivablePortfolioSegmentAxis=abr_BridgeLoanSixMultifamilyPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_LimitedLiabilityCompany1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=abr_AMACIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=abr_CommercialMortgageBackedSecurityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=abr_ResidentialMortgageBankingCompanyAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=abr_AgencyPlatformAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=abr_SecuredOvernightFinancingRateSOFRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MatureDateOfApril2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfJune2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateLoanTypeAxis=abr_PrivateLabelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=abr_PreferredEquityInvestmentsInMortgageLoansMember
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: | abr_LoansReceivableMaturityAxis=abr_MaturesInApril2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfSeptember2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateDecember2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=abr_LondonInterbankOfferedRateLIBOR1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMay2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfMarch2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturesInMay2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfFourthQuarter2020Member
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: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOfOctober2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturityDateOf2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=abr_GinkgoInvestmentCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abr_LoansReceivableMaturityAxis=abr_MaturesInOctober2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=abr_PreferredEquityInterestFinancingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |