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INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended | 70 Months Ended
--- | --- | --- | --- | ---
Nov. 26, 2019 | Sep. 30, 2025 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2025
INVESTMENT SECURITIES |  |  |  |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 35,022 |  | $ 39,666 |  |  | $ 35,022
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |  |  |
Number of shares owned |  | 2,470,000 |  |  |  |  | 2,470,000
Investment ownership percentage (as a percent) |  | 16.10% |  |  |  |  | 16.10%
Investment in Alpine Income Property Trust, Inc. |  | $ 35,022 |  | 39,666 |  |  | $ 35,022
Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |  |  |
Share purchased |  |  |  |  |  |  | 1,223,854
Investment ownership percentage (as a percent) |  | 8.00% |  |  |  |  | 8.00%
Investment in Alpine Income Property Trust, Inc. |  | $ 17,342 |  | $ 20,549 |  |  | $ 17,342
Common Stock |  |  |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |  |  |
Share purchased | 421,053 | 109,081 | 129,271 | 29,807 | 155,665 | 8,088 | 1,247,702
Investment ownership percentage (as a percent) |  | 8.10% |  |  |  |  | 8.10%
Investment in Alpine Income Property Trust, Inc. |  | $ 17,680 |  | $ 19,117 |  |  | $ 17,680

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