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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Trouble debt restructurings [Abstract]      
Recorded investment in troubled debt restructurings $ 6,800,000 $ 7,700,000 $ 10,200,000
Specific reserves allocated for troubled debt restructuring 900,000 700,000 900,000
Troubled debt restructurings accruing interest under modified terms 800,000 1,700,000 5,800,000
Troubled debt restructurings on non-accrual status 6,000,000 6,000,000 4,400,000
Additional amounts committed to customers with loans classified as troubled debt restructurings $ 0 $ 0 0
Additional amounts of interest and past due escrow payments capitalized     $ 4,000
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan 2 5 9
Pre-Modification Outstanding Recorded Investment $ 491,000 $ 948,000 $ 854,000
Post-Modification Outstanding Recorded Investment 491,000 948,000 $ 769,000
Increase in allowance for loan losses related to troubled debt restructurings 400,000 100,000  
Troubled debt restructurings, charge offs (less than $0.1 million in 2014) $ 0 $ 0  
Number of days past due after which a loan is considered to be in payment default 90 days    
Financing receivable, modifications, subsequent default, number of loans | loan 1   0
Financing receivable, modifications, subsequent default, recorded investment $ 164,000    
Commercial mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Financing receivable, modifications, subsequent default, number of loans | loan 1    
Financing receivable, modifications, subsequent default, recorded investment $ 164,000    
Residential Mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   1  
Pre-Modification Outstanding Recorded Investment   $ 105,000  
Post-Modification Outstanding Recorded Investment   $ 105,000  
Commercial mortgages:      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan     1
Commercial mortgages: | Commercial mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   1 6
Pre-Modification Outstanding Recorded Investment   $ 166,000 $ 485,000
Post-Modification Outstanding Recorded Investment   $ 166,000 $ 388,000
Residential Mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan     2
Pre-Modification Outstanding Recorded Investment     $ 295,000
Post-Modification Outstanding Recorded Investment     $ 307,000
Consumer Loans | Home equity lines and loans      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan     1
Pre-Modification Outstanding Recorded Investment     $ 74,000
Post-Modification Outstanding Recorded Investment     $ 74,000
Extended Maturity      
Trouble debt restructurings [Abstract]      
Troubled debt restructuring, extension of maturity date, duration     13 years
Closing costs capitalized on restructured loan     $ 8,000
Loan Consolidation      
Trouble debt restructurings [Abstract]      
Troubled debt restructuring, extension of maturity date, duration 2 years    
Extended Maturity, Interest Rate Below Market Reduction | Commercial mortgages: | Commercial mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan     5
Payment Deferral      
Trouble debt restructurings [Abstract]      
Postponement or reduction, amortized payments, period     3 months
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 2    
Troubled debt restructurings, charge offs (less than $0.1 million in 2014)     $ 97,000
Commercial and industrial      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan 2    
Pre-Modification Outstanding Recorded Investment $ 491,000    
Post-Modification Outstanding Recorded Investment $ 491,000    
Commercial and industrial | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   3  
Pre-Modification Outstanding Recorded Investment   $ 677,000  
Post-Modification Outstanding Recorded Investment   $ 677,000  
Commercial and industrial | Principal Forgiveness | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   2  
Commercial and industrial | Extended Maturity | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   1  
Commercial and industrial | Loan Consolidation | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans | loan   2