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INVESTMENT SECURITIES - Tabular Disclosure (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | $ 43,735 | $ 41,635
Unrealized Gains in Investment Income |  | 406
Unrealized Losses in Investment Income | (4,290) |
Investment Securities | 39,445 | 42,041
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 | 41,635
Unrealized Gains in Investment Income |  | 406
Unrealized Losses in Investment Income | (4,290) |
Investment Securities | 39,445 | 42,041
Common Stock |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 20,482 | 18,382
Unrealized Gains in Investment Income |  | 308
Unrealized Losses in Investment Income | (1,732) |
Investment Securities | 18,750 | 18,690
Alpine Income Property OP, LP Limited Partnership Units |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 23,253 | 23,253
Unrealized Gains in Investment Income |  | 98
Unrealized Losses in Investment Income | (2,558) |
Investment Securities | $ 20,695 | $ 23,351

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