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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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