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INVESTMENT SECURITIES - CORPORATE BONDS AND MORTGAGE BACKED SECURITIES (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Private label mortgage backed security    
Amortized cost and fair value of the investment securities portfolio by contractual maturity    
Securities $ 2,780,000  
Mortgage backed securities and CMOs    
Amortized cost and fair value of the investment securities portfolio by contractual maturity    
Gross unrealized losses on available for sale securities $ 152,000 $ 13,000