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INVESTMENT SECURITIES - General Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 26, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 26, 2021
Marketable Securities [Line Items]          
Share purchased 1,223,854 823,878      
Purchase price of shares   $ 357 $ 513 $ 532  
Equity Method Investments   $ 0 48,677    
Equity method investment, ownership percentage (as a percent)   6.30%      
Investment in Alpine Income Property Trust, Inc.   $ 41,037 $ 30,574    
Alpine Income Property Trust, Inc.          
Marketable Securities [Line Items]          
Share purchased   8,088      
Number of shares owned   2,050,000.00      
Purchase price of shares   $ 100      
Closing share price (in dollars per share)   $ 17.65      
Equity method investment, ownership percentage (as a percent)   15.60%      
Investment in Alpine Income Property Trust, Inc.   $ 41,000      
Alpine Income Property Trust, Inc. | OP Units          
Marketable Securities [Line Items]          
Purchase price of shares $ 23,300        
Equity method investment, ownership percentage (as a percent)   9.30%      
Alpine          
Marketable Securities [Line Items]          
Share purchased   823,878      
Closing share price (in dollars per share)   $ 17.65     $ 17.75
Private placement          
Marketable Securities [Line Items]          
Share purchased 394,737        
Purchase price of shares $ 7,500        
IPO Purchase          
Marketable Securities [Line Items]          
Share purchased     815,790 815,790  
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