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INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended			70 Months Ended
	Nov. 26, 2019	Sep. 30, 2025	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2025
INVESTMENT SECURITIES
Investment in Alpine Income Property Trust, Inc.		$ 35,022		$ 39,666			$ 35,022
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units
INVESTMENT SECURITIES
Number of shares owned		2,470,000					2,470,000
Investment ownership percentage (as a percent)		16.10%					16.10%
Investment in Alpine Income Property Trust, Inc.		$ 35,022		39,666			$ 35,022
Alpine Income Property OP, LP Limited Partnership Units
INVESTMENT SECURITIES
Share purchased							1,223,854
Investment ownership percentage (as a percent)		8.00%					8.00%
Investment in Alpine Income Property Trust, Inc.		$ 17,342		$ 20,549			$ 17,342
Common Stock
INVESTMENT SECURITIES
Share purchased	421,053	109,081	129,271	29,807	155,665	8,088	1,247,702
Investment ownership percentage (as a percent)		8.10%					8.10%
Investment in Alpine Income Property Trust, Inc.		$ 17,680		$ 19,117			$ 17,680

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