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SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
security
Jan. 01, 2021
USD ($)
Investment Holdings [Line Items]    
Allowance on AFS debt securities | $ $ 0 $ 0
Accounting Standards Update 2016-13    
Investment Holdings [Line Items]    
Allowance on AFS debt securities | $ $ 0  
US Government-sponsored enterprises    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 49  
Available for sale securities portfolio, number of securities (security) 528  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) 1.07%  
US Government agency    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 11  
Available for sale securities portfolio, number of securities (security) 150  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) 0.45%  
Private label    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 14  
Available for sale securities portfolio, number of securities (security) 31  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) 0.18%  
Obligations of states and political subdivisions thereof    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 12  
Available for sale securities portfolio, number of securities (security) 119  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) 0.52%  
Corporate bonds    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 4  
Available for sale securities portfolio, number of securities (security) 27  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) 0.78%