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INVESTMENT SECURITIES - Amortized cost and estimated fair value of available-for-sale securities excluding SBIC (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 35,750 $ 59,100
Fair Value 36,666 58,903
Debt available for sale securities pledged as collateral $ 3,700 $ 5,500
Threshold Percentage Of Shareholders Equity Amount Held As Securities By One Issuer 10.00% 10.00%
Unrealized loss $ 64 $ 409
Number of securities in continuous unrealized loss position for more than twelve months | security 2  
Available for sale securities, excluding SBIC    
Debt Securities, Available-for-sale [Line Items]    
Due within one year amortized cost $ 250  
Due between one year through five years amortized cost 1,250  
Due between five years and ten years amortised cost 4,750  
Due within one year fair value 254  
Due after one year through five years fair value 1,245  
Due between five years and ten years fair value 4,799  
Mortgage-related securities, amortized cost 29,500  
Mortgage-related securities, fair value 30,368  
Amortized Cost 35,750  
Fair Value $ 36,666  
Number of securities in unrealized loss position | security 7 26