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INVESTMENT SECURITIES - Available-for-sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities |  |
Investment Securities | $ 35,022 | $ 39,666
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |
Available-for-sale securities |  |
Cost | 45,739 | 44,182
Unrealized Losses in Investment Income | (10,717) | (4,516)
Investment Securities | 35,022 | 39,666
Common Stock |  |
Available-for-sale securities |  |
Cost | 22,486 | 20,929
Unrealized Losses in Investment Income | (4,806) | (1,812)
Investment Securities | 17,680 | 19,117
Alpine Income Property OP, LP Limited Partnership Units |  |
Available-for-sale securities |  |
Cost | 23,253 | 23,253
Unrealized Losses in Investment Income | (5,911) | (2,704)
Investment Securities | $ 17,342 | $ 20,549

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