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FAIR VALUE MEASUREMENTS - Fair Value of Derivatives (Details)
 9 Months Ended
Sep. 30, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
FAIR VALUE MEASUREMENTS    
Number of mortgage loans outstanding with related interest rate swaps | item 16  
Interest rate swap | Level 2    
Financial assets:    
Financial assets $ 1,338,000 $ 1,811,000
Financial assets, Balance Sheet Classification Escrow, deposits and other assets and receivables Escrow, deposits and other assets and receivables
Interest rate swap | Cash flow hedges    
FAIR VALUE MEASUREMENTS    
Number of interest rate derivatives held | item 16  
Notional Amount $ 41,054,000  
Weighted average maturity 1 year 1 month 6 days  
Weighted average annual interest rate (as a percent) 3.97%  
Financial liabilities:    
Financial liabilities $ 0 $ 0
Interest rate swap | Cash flow hedges | Minimum    
FAIR VALUE MEASUREMENTS    
Fixed interest rate (as a percent) 2.97%  
Interest rate swap | Cash flow hedges | Maximum    
FAIR VALUE MEASUREMENTS    
Fixed interest rate (as a percent) 4.60%