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INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended | 52 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 26, 2019 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2024 | Dec. 31, 2023
Marketable Securities [Line Items] |  |  |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  | $ 35,643 | $ 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 |  |  |  |  | 2,330,000 |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  | $ 35,643 | 39,445
Investment ownership percentage (as a percent) |  |  |  |  | 15.70% |
Common Stock |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Share purchased | 421,053 | 129,271 | 155,665 | 8,088 | 1,108,814 |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  | $ 16,942 | 18,750
Investment ownership percentage (as a percent) |  |  |  |  | 7.50% |
Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Share purchased |  |  |  |  | 1,223,854 |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  | $ 18,701 | $ 20,695
Investment ownership percentage (as a percent) |  |  |  |  | 8.20% |

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