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INVESTMENT SECURITIES - General Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 26, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Oct. 26, 2021
Marketable Securities [Line Items]          
Share purchased   828,643      
Purchase price of shares   $ 149 $ 292    
Equity Method Investments   0   $ 0  
Investment in Alpine Income Property Trust, Inc.   $ 38,587   $ 41,037  
Alpine Income Property Trust, Inc.          
Marketable Securities [Line Items]          
Share purchased   4,765   8,088  
Number of shares owned   2,050,000.00      
Purchase price of shares   $ 100   $ 100  
Closing share price (in dollars per share)   $ 18.47   $ 17.65  
Investment in Alpine Income Property Trust, Inc.   $ 38,600      
Alpine          
Marketable Securities [Line Items]          
Share purchased   828,643      
Closing share price (in dollars per share)   $ 18.47   $ 17.65 $ 17.75
IPO Purchase          
Marketable Securities [Line Items]          
Share purchased   815,790      
IPO Purchase | Alpine Income Property Trust, Inc.          
Marketable Securities [Line Items]          
Share purchased 421,053        
Purchase price of shares $ 8,000        
OP Units | Alpine Income Property Trust, Inc.          
Marketable Securities [Line Items]          
Share purchased   1,223,854