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LEASES - As Lessee - Ground Lease and Office Lease (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Lessee Accounting      
Operating lease liability $ 7,212,000    
Operating lease liability, Statement of Financial Position Accrued expenses and other liabilities    
Operating lease, right-of-use asset, Statement of Financial Position Escrow, deposits and other assets and receivables    
Real Estate in Greensboro, NC      
Lessee Accounting      
Operating lease liability $ 6,634,000 $ 6,895,000  
Right-of-use asset $ 6,267,000 6,663,000  
Operating lease, discount rate (as a percent) 2.95%    
Operating lease, remaining lease term 13 years 2 months 12 days    
Real Estate in Greensboro, NC | Real estate expenses      
Lessee Accounting      
Operating lease expense $ 599,000 533,000 $ 525,000
Real Estate in Greensboro, NC | Five-Year Lease      
Lessee Accounting      
Operating lease, number of renewal options | item 4    
Operating lease, renewal term 5 years    
Operating lease, option to extend true    
Real Estate in Greensboro, NC | Seven-Month Lease      
Lessee Accounting      
Operating lease, number of renewal options | item 1    
Operating lease, renewal term 7 months    
Operating lease, option to extend true    
Corporate office lease in Great Neck, NY      
Lessee Accounting      
Operating lease, renewal term 5 years    
Operating lease, option to extend true    
Operating lease liability $ 578,000 602,000  
Right-of-use asset $ 564,000 593,000  
Operating lease, discount rate (as a percent) 3.81%    
Operating lease, remaining lease term 15 years    
Corporate office lease in Great Neck, NY | General and administrative expense      
Lessee Accounting      
Operating lease expense $ 55,000 $ 57,000 $ 54,000