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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balances Evaluated for Impairment and Related Allowance for Loan Losses Allocation (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment $ 6,154   $ 11,026      
Loans, Collectively evaluated for impairment 1,057,729   998,986      
Total Loans 1,063,883   1,010,012      
Allowance for loan losses, Individually evaluated for impairment 39   51      
Allowance for loan losses, Collectively evaluated for impairment 13,398   12,745      
Allowance for loan losses, Total 13,437 $ 13,000 12,796 $ 12,751 $ 12,668 $ 12,775
Commercial and Industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 130,280   115,663      
Municipal            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 39,753   42,065      
Installment and Other            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total Loans 28,787   21,902      
Commercial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 2,205   6,690      
Loans, Collectively evaluated for impairment 721,551   674,935      
Total Loans 723,756   681,625      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 9,078   8,710      
Allowance for loan losses, Total 9,078   8,710      
Commercial | Commercial Real Estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 1,681   5,848      
Loans, Collectively evaluated for impairment 504,468   487,068      
Total Loans 506,149   492,916      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 6,680   6,763      
Allowance for loan losses, Total 6,680   6,763      
Commercial | Acquisition and Development            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 201   492      
Loans, Collectively evaluated for impairment 47,373   30,489      
Total Loans 47,574   30,981      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 720   417      
Allowance for loan losses, Total 720   417      
Commercial | Commercial and Industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 323   350      
Loans, Collectively evaluated for impairment 129,957   115,313      
Total Loans 130,280   115,663      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 1,598   1,446      
Allowance for loan losses, Total 1,598   1,446      
Commercial | Municipal            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 39,753   42,065      
Total Loans 39,753   42,065      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 80   84      
Allowance for loan losses, Total 80   84      
Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 3,949   4,336      
Loans, Collectively evaluated for impairment 336,178   324,051      
Total Loans 340,127   328,387      
Allowance for loan losses, Individually evaluated for impairment 39   51      
Allowance for loan losses, Collectively evaluated for impairment 3,735   3,560      
Allowance for loan losses, Total 3,774   3,611      
Consumer | Residential Mortgage            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 3,948   4,325      
Loans, Collectively evaluated for impairment 307,392   302,160      
Total Loans 311,340   306,485      
Allowance for loan losses, Individually evaluated for impairment 39   42      
Allowance for loan losses, Collectively evaluated for impairment 3,505   3,358      
Allowance for loan losses, Total 3,544   3,400      
Consumer | Installment and Other            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 1   11      
Loans, Collectively evaluated for impairment 28,786   21,891      
Total Loans 28,787   21,902      
Allowance for loan losses, Individually evaluated for impairment 0   9      
Allowance for loan losses, Collectively evaluated for impairment 230   202      
Allowance for loan losses, Total 230   211      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 0   0      
Total Loans 0   0      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 585   475      
Allowance for loan losses, Total $ 585   $ 475