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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Subsidiary
Trust
Branch
County
Component
Calculation
Segment
Factor
Type
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Subsidiary, Sale of Stock [Line Items]        
Number of significant consolidated subsidiaries owned | Subsidiary   2    
Number of unconsolidated subsidiary business trusts owned | Trust   3    
Number of bank branches | Branch   225    
Risks and Uncertainties [Abstract]        
Number of main components of economic risk | Component   3    
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Period for which a nonaccrual TDR loan remains on nonaccrual status   12 months    
Number of days past due for loans to be placed on nonaccrual status   90 days    
Allowance for Loan Losses [Abstract]        
Number of broad components used in allowance methodology | Component   2    
Number of calculations used for general loan loss allocations | Calculation   2    
Number of main loan segments | Segment   5    
Period of historical net charge-off data for each loan class used in determining allowance level   36 months    
Number of qualitative environmental factors used in qualitative calculation for general loan loss allocations | Factor   8    
Other Real Estate [Abstract]        
Other real estate   $ 1,900 $ 2,000  
Derivative Financial Instruments and Hedging Activities [Abstract]        
Number of types of derivative financial instruments | Type   3    
Advertising [Abstract]        
Advertising costs   $ 5,700 $ 3,900 $ 3,600
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Corporate income tax rate   35.00% 35.00% 35.00%
Reclassification related to tax effect of Tax Cuts and Jobs Act   $ 0    
Minimum [Member]        
Investments in Real Estate Limited Partnerships [Abstract]        
Company's ownership interest in limited partnerships   5.00%    
Maximum [Member]        
Investments in Real Estate Limited Partnerships [Abstract]        
Company's ownership interest in limited partnerships   99.99%    
Retained Earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification related to tax effect of Tax Cuts and Jobs Act   $ 645    
Accumulated Other Comprehensive Income/(Loss) [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification related to tax effect of Tax Cuts and Jobs Act   (645)    
ASU 2014-01 [Member]        
Investments in Real Estate Limited Partnerships [Abstract]        
Unfunded commitments   3,200    
Impairment losses related to real estate partnerships   0    
ASU 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Effect of change on net income from excess tax benefits   $ 3,100    
Effect of change on net income from excess tax benefits per diluted common share (in dollars per share) | $ / shares   $ 0.06    
ASU 2018-02 [Member] | Retained Earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification related to tax effect of Tax Cuts and Jobs Act   $ 645    
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income/(Loss) [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification related to tax effect of Tax Cuts and Jobs Act   $ (645)    
Plan [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Corporate income tax rate 21.00%      
Plan [Member] | ASU 2018-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Corporate income tax rate 21.00%      
Upstate New York [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of counties where the bank has facilities | County   35    
Northeastern Pennsylvania [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of counties where the bank has facilities | County   6    
Vermont [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of counties where the bank has facilities | County   12    
Western Massachusetts [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of counties where the bank has facilities | County   1    
Consumer Installment Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number of days past due after which loans are charged off to the extent outstanding principal balance exceeds fair value of collateral/property   90 days    
Consumer Mortgage Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number of days past due after which loans are charged off to the extent outstanding principal balance exceeds fair value of collateral/property   180 days    
Home Equity Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number of days past due after which loans are charged off to the extent outstanding principal balance exceeds fair value of collateral/property   180 days    
Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   3 years    
Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   10 years    
Software [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   3 years    
Software [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   7 years    
Hardware [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   3 years    
Hardware [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   7 years    
Building and Building Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   10 years    
Building and Building Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   40 years    
Land Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Estimated useful life   20 years    
BPAS [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of significant consolidated subsidiaries owned | Subsidiary   5    
Hand Benefits & Trust [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of significant consolidated subsidiaries owned | Subsidiary   1    
NRS [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of significant consolidated subsidiaries owned | Subsidiary   1    
Core Deposits [Member] | Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset useful life (amortization period)   7 years    
Core Deposits [Member] | Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset useful life (amortization period)   20 years    
Customer Relationships [Member] | Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset useful life (amortization period)   7 years    
Customer Relationships [Member] | Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset useful life (amortization period)   20 years    
Commercial Portfolio Segment [Member] | Minimum [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Threshold balance of loans individually evaluated for impairment   $ 500