INVESTMENT SECURITIES - Tabular Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Cost	$ 40,693	$ 38,896
Unrealized Gains in Investment Income		2,141
Unrealized Losses in Investment Income	(2,210)
Investment Securities	38,483	41,037
Operating Units
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Cost	23,253	23,253
Unrealized Gains in Investment Income		1,273
Unrealized Losses in Investment Income	(1,322)
Investment Securities	21,931	24,526
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	40,693	38,896
Unrealized Gains in Investment Income		2,141
Unrealized Losses in Investment Income	(2,210)
Investment Securities	38,483	41,037
Common Stock
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Cost	17,440	15,643
Unrealized Gains in Investment Income		868
Unrealized Losses in Investment Income	(888)
Investment Securities	$ 16,552	$ 16,511

Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax

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Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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