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INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended | 58 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 26, 2019 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2024 | Dec. 31, 2023
Marketable Securities [Line Items] |  |  |  |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 42,997 |  |  |  | $ 42,997 | $ 39,445
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |  |
Number of shares owned |  | 2,360,000 |  |  |  | 2,360,000 |
Investment ownership percentage (as a percent) |  | 15.30% |  |  |  | 15.30% |
Investment in Alpine Income Property Trust, Inc. |  | $ 42,997 |  |  |  | $ 42,997 | 39,445
Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |  |
Investment ownership percentage (as a percent) |  | 7.90% |  |  |  | 7.90% |
Investment in Alpine Income Property Trust, Inc. |  | $ 22,274 |  |  |  | $ 22,274 | 20,695
Share purchased |  |  |  |  |  | 1,223,854 |
Common Stock |  |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |  |
Investment ownership percentage (as a percent) |  | 7.40% |  |  |  | 7.40% |
Investment in Alpine Income Property Trust, Inc. |  | $ 20,723 |  |  |  | $ 20,723 | $ 18,750
Share purchased | 421,053 | 29,807 | 129,271 | 155,665 | 8,088 | 1,138,621 |

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