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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
loan
borrower
instrument
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Trouble debt restructurings [Abstract]      
Recorded investment in troubled debt restructurings | $ $ 6,700,000 $ 9,000,000.0 $ 6,800,000
Specific reserves allocated to troubled debt restructuring | $ 400,000 2,300,000 900,000
Troubled debt restructurings accruing interest under modified terms | $ 2,800,000 900,000 800,000
Troubled debt restructurings on non-accrual status | $ 3,900,000 8,100,000 6,000,000.0
Additional amounts committed to customers with loans classified as troubled debt restructurings | $ $ 17,000 $ 0 $ 0
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 15 3 2
Pre-Modification Outstanding Recorded Investment | $ $ 5,100,000 $ 4,483,000 $ 491,000
Post-Modification Outstanding Recorded Investment | $ 5,100,000 4,483,000 491,000
Increase in allowance for loan losses related to troubled debt restructurings | $ 200,000 1,700,000 400,000
Troubled debt restructurings, charge offs | $ $ 0 $ 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 | instrument 1    
Financing receivable, modifications, subsequent default, recorded investment | $ $ 170,000    
Commercial mortgages | Commercial mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 4 1  
Pre-Modification Outstanding Recorded Investment | $ $ 1,297,000 $ 4,223,000  
Post-Modification Outstanding Recorded Investment | $ $ 1,297,000 $ 4,223,000  
Residential Mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 4 1  
Pre-Modification Outstanding Recorded Investment | $ $ 997,000 $ 123,000  
Post-Modification Outstanding Recorded Investment | $ $ 997,000 $ 123,000  
Consumer Loans | Home equity lines and loans      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3 1  
Pre-Modification Outstanding Recorded Investment | $ $ 738,000 $ 137,000  
Post-Modification Outstanding Recorded Investment | $ $ 738,000 $ 137,000  
Financing receivable, modifications, subsequent default, number of loans | instrument 1    
Financing receivable, modifications, subsequent default, recorded investment | $ $ 170,000    
Commercial And Consumer Portfolio Segment      
Trouble debt restructurings [Abstract]      
Financing receivable, modifications, loan balance remaining in modified status, modified more than once | $ $ 20,100,000    
Financing receivable, number of loans remaining in modified status 31    
Financing receivable, modifications, loan balance remaining in modified status | $ $ 20,800,000    
Financing receivable, number of loans remaining in modified status, modified more than once 18    
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 1,064    
Post-Modification Outstanding Recorded Investment | $ $ 211,200,000    
Principal Forgiveness | Commercial mortgages      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans   1  
Principal Forgiveness | Residential Mortgage      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 1    
Interest Rate Below Market Reduction | Consumer Loans | Home equity lines and loans      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans   1  
Payment Deferral      
Trouble debt restructurings [Abstract]      
Financing receivable, modifications, number of days past due 30 days    
Payment Deferral | Commercial mortgages      
Trouble debt restructurings [Abstract]      
Financing receivable, modifications, number of borrowers | borrower 3    
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 4    
Payment Deferral | Commercial mortgages | Substandard | Non-accrual Status      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3    
Payment Deferral | Commercial mortgages | Substandard | Non-accrual Status | 30 - 59 Days Past Due      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 2    
Payment Deferral | Home equity lines and loans      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3    
Payment Deferral | Home equity lines and loans | Substandard | Non-accrual Status      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3    
Payment Deferral | Residential Mortgage      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3    
Payment Deferral | Residential Mortgage | Non-accrual Status      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 3    
Payment Deferral | Residential Mortgage | Substandard | Non-accrual Status      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 2    
Payment Deferral | Residential Mortgage | Substandard | Non-accrual Status | 30 - 59 Days Past Due      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 1    
Extended Maturity and Interest Rate Below Market Reduction | Residential Mortgage      
Trouble debt restructurings [Abstract]      
Troubled debt restructuring, extension of maturity date, duration   13 years  
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans   1  
Extended Maturity and Interest Rate Below Market Reduction | Consumer Loans | Home equity lines and loans      
Trouble debt restructurings [Abstract]      
Troubled debt restructuring, extension of maturity date, duration   3 years  
Commercial and industrial | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 4   2
Pre-Modification Outstanding Recorded Investment | $ $ 2,068,000   $ 491,000
Post-Modification Outstanding Recorded Investment | $ $ 2,068,000   $ 491,000
Commercial and industrial | Interest Rate Below Market Reduction      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 2    
Commercial and industrial | Interest Rate Below Market Reduction | Non-accrual Status      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 1    
Commercial and industrial | Extended Maturity      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 2    
Commercial and industrial | Extended Maturity and Interest Rate Below Market Reduction      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans 1    
Commercial and industrial | Extended Maturity and Interest Rate Below Market Reduction | Commercial, and Agricultural      
Loans by class modified as troubled debt restructurings [Abstract]      
Number of Loans     2