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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
DERIVATIVE FINANCIAL INSTRUMENTS      
Cash pledged $ 1,030,000 $ 1,630,000  
Securities pledged $ 7,693,000 $ 15,490,000  
Interest rate swap | Cash flow hedge | Variable-rate borrowings      
DERIVATIVE FINANCIAL INSTRUMENTS      
Notional amount     $ 10,000,000