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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Book value, fair value of commercial serving rights and impairment) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Valuation Allowance $ 1,900,000  
15 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 1,627,000 $ 1,522,000
Fair Value 1,157,000 1,100,000
Valuation Allowance 470,000 422,000
30 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 6,287,000 5,445,000
Fair Value 4,402,000 4,089,000
Valuation Allowance 1,885,000 1,356,000
Less Than 20 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 58,000 87,000
Fair Value 170,000 203,000
Valuation Allowance 0 0
More Than 20 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 584,000 776,000
Fair Value 934,000 1,085,000
Valuation Allowance $ 0 $ 0