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BUSINESS SEGMENT DATA - Description (Details)
12 Months Ended
Dec. 31, 2022
loan
segment
Dec. 31, 2021
Dec. 31, 2020
BUSINESS SEGMENT DATA      
Number of operating segment | segment 4    
Number of commercial loan investment 3    
Commercial Real Estate Portfolio Segment      
BUSINESS SEGMENT DATA      
Number of commercial loan investment 3    
Number of preferred equity investments 1    
Product concentration | Identifiable Assets [Member] | Income Properties      
BUSINESS SEGMENT DATA      
Percentage of total 91.00% 86.00%  
Product concentration | Base Rent Revenues | Income Properties      
BUSINESS SEGMENT DATA      
Percentage of total 83.60% 72.10% 88.60%