INVESTMENT SECURITIES - Tabular Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Cost	$ 44,182	$ 43,735
Unrealized Losses in Investment Income	(1,185)	(4,290)
Investment Securities	42,997	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	44,182	43,735
Unrealized Losses in Investment Income	(1,185)	(4,290)
Investment Securities	42,997	39,445
Common Stock
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Cost	20,929	20,482
Unrealized Losses in Investment Income	(206)	(1,732)
Investment Securities	20,723	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	(979)	(2,558)
Investment Securities	$ 22,274	$ 20,695