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INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 26, 2019 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Marketable Securities [Line Items] |  |  |  |
Share purchased |  | 26,355 | 126,133 |
Purchase price of shares |  | $ 500 | $ 2,300 |
Equity Method Investments |  | 0 | 0 | $ 0
Investment in Alpine Income Property Trust, Inc. |  | $ 35,260 | $ 35,260 | 41,037
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Number of shares owned |  | 2,170,000 | 2,170,000 |
Investment in Alpine Income Property Trust, Inc. |  | $ 35,260 | $ 35,260 | $ 41,037
Investment ownership percentage (as a percent) |  | 16.00% | 16.00% |
Common Stock |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Share purchased |  |  | 950,011 | 8,088
Purchase price of shares |  |  |  | $ 100
Investment in Alpine Income Property Trust, Inc. |  | $ 15,409 | $ 15,409 | $ 16,511
Investment ownership percentage (as a percent) |  | 8.00% | 8.00% |
Common Stock | IPO Purchase |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Share purchased | 421,053 |  |  |
Purchase price of shares | $ 8,000 |  |  |
Alpine Income Property OP, LP Limited Partnership Units |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Share purchased |  |  | 1,223,854 |
Investment ownership percentage (as a percent) |  | 9.00% | 9.00% |
Alpine |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Share purchased |  |  | 950,011 |

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