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INVESTMENT SECURITIES - Tabular Disclosure (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | $ 43,735 | $ 43,735
Unrealized Losses in Investment Income | (8,092) | (4,290)
Investment Securities | 35,643 | 39,445
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 43,735 | 43,735
Unrealized Losses in Investment Income | (8,092) | (4,290)
Investment Securities | 35,643 | 39,445
Common Stock |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 20,482 | 20,482
Unrealized Losses in Investment Income | (3,540) | (1,732)
Investment Securities | 16,942 | 18,750
Alpine Income Property OP, LP Limited Partnership Units |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 23,253 | 23,253
Unrealized Losses in Investment Income | (4,552) | (2,558)
Investment Securities | $ 18,701 | $ 20,695

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