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INVESTMENT SECURITIES - Amortized cost and estimated fair value of available-for-sale securities excluding SBIC (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 24,857 $ 35,750
Fair Value 25,532 36,666
Debt available for sale securities pledged as collateral $ 2,900 $ 3,700
Threshold Percentage Of Shareholders Equity Amount Held As Securities By One Issuer 10.00% 10.00%
Unrealized loss $ 38 $ 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 within one year amortized cost $ 250  
Due between one year and five years amortized cost 1,250  
Due between five years and ten years amortized cost 4,750  
Due within one year fair value 251  
Due between one year and five years fair value 1,245  
Due between five years and ten years fair value 4,897  
Securities, amortized cost 18,607  
Securities, fair value 19,139  
Amortized Cost 24,857  
Fair Value $ 25,532  
Number of securities in unrealized loss position | security 5 7