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INVESTMENT SECURITIES - Tabular Disclosure (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | $ 43,735 | $ 41,635
Unrealized Gains in Investment Income |  | 406
Unrealized Losses in Investment Income | (4,476) |
Investment Securities | 39,259 | 42,041
Operating Units |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 23,253 | 23,253
Unrealized Gains in Investment Income |  | 98
Unrealized Losses in Investment Income | (2,656) |
Investment Securities | 20,597 | 23,351
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 | 43,735 | 41,635
Unrealized Gains in Investment Income |  | 406
Unrealized Losses in Investment Income | (4,476) |
Investment Securities | 39,259 | 42,041
Common Stock [Member] |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Cost | 20,482 | 18,382
Unrealized Gains in Investment Income |  | 308
Unrealized Losses in Investment Income | (1,820) |
Investment Securities | $ 18,662 | $ 18,690

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- Definition Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax + References No definition available. + Details
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- Definition 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 + Details
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