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COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
derivative
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
derivative
swap
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
derivative
Other Commitments [Line Items]          
Loss Contingency Accrual $ 0   $ 0   $ 0
Unrealized Gain (Loss) on Derivatives 467,000 $ 46,000 $ 871,000 $ 38,000  
Derivative, Number of Interest Rate Swap Agreements | swap     2    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     $ 900,000    
Customer Loan Swaps          
Other Commitments [Line Items]          
Cash held as collateral 26,200,000   26,200,000   5,100,000
Notional amount of derivative 832,286,000   832,286,000   833,030,000
Interest Rate Swap On Loans [Member]          
Other Commitments [Line Items]          
Cash held as collateral 1,500,000.0   1,500,000.0    
Notional amount of derivative 100,000,000   100,000,000   0
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges     176,000    
Loss on Cash Flow Hedge Ineffectiveness 0   0    
Interest rate swaps          
Other Commitments [Line Items]          
Cash held as collateral 10,100,000   10,100,000   5,800,000
Notional amount of derivative 43,000,000   43,000,000   43,000,000
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges     518,000 689,000  
Loss on Cash Flow Hedge Ineffectiveness 0 0 0 0  
Forward-Starting Interest Rate Swap          
Other Commitments [Line Items]          
Notional amount of derivative 0   0   25,000,000
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges 32,000 24,000      
Forward Contracts [Member]          
Other Commitments [Line Items]          
Notional amount of derivative 16,630,000   16,630,000   4,315,000
Unrealized Gain (Loss) on Derivatives 238,000 $ 49,000 480,000 $ 99,000  
Cancellable Commitment          
Other Commitments [Line Items]          
Contractual Amounts Of Financial Instrument 275,100,000   275,100,000   270,800,000
Federal home loan bank 30-day | Interest rate swaps          
Other Commitments [Line Items]          
Notional amount of derivative $ 414,997,000   $ 414,997,000   $ 118,891,000
Derivative, Number of Instruments Held | derivative 84   84   25
Commercial and Industrial Sector [Member] | Interest rate swaps          
Other Commitments [Line Items]          
Notional amount of derivative $ 416,143,000   $ 416,143,000   $ 416,515,000
Derivative, Number of Instruments Held | derivative 85   85   82
Contract Two [Member] | Interest rate swaps          
Other Commitments [Line Items]          
Notional amount of derivative $ 10,000,000   $ 10,000,000   $ 10,000,000
Contract Two [Member] | Forward-Starting Interest Rate Swap          
Other Commitments [Line Items]          
Notional amount of derivative 0   0   25,000,000
Contract, One | Interest rate swaps          
Other Commitments [Line Items]          
Notional amount of derivative $ 10,000,000   $ 10,000,000   $ 10,000,000