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INVESTMENT SECURITIES - Amortized cost and estimated fair value of available-for-sale securities excluding SBIC (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 31,602 $ 35,750
Fair Value 32,233 36,666
Debt available for sale securities pledged as collateral $ 2,300 $ 3,700
Threshold Percentage Of Shareholders Equity Amount Held As Securities By One Issuer 10.00% 10.00%
Unrealized loss $ 57 $ 64
Number of securities in continuous unrealized loss position for more than twelve months | security 1  
Available for sale securities, excluding SBIC    
Debt Securities, Available-for-sale [Line Items]    
Due between one year and five years amortized cost $ 250  
Due between five years and ten years amortized cost 8,117  
Due between one year and five years fair value 249  
Due between five years and ten years fair value 8,356  
Securities, amortized cost 23,235  
Securities, fair value 23,628  
Amortized Cost 31,602  
Fair Value 32,233  
Unrealized loss $ 100 $ 100
Number of securities in unrealized loss position | security 7 7