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COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
derivative
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
derivative
swap
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
derivative
Other Commitments [Line Items]          
Loss Contingency Accrual $ 0   $ 0   $ 0
Loss on Cash Flow Hedge Ineffectiveness $ 0   $ 0   0
Derivative, Number of Instruments Held | derivative 2   2    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     $ 548,000    
Unrealized Gain (Loss) on Derivatives $ (4,000) $ (235,000) 8,000 $ (223,000)  
Interest rate swaps          
Other Commitments [Line Items]          
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges     489,000 666,000  
Notional amount of derivative 43,000,000   43,000,000   43,000,000
Cash held as collateral 5,500,000   5,500,000    
Forward-Starting Interest Rate Swap          
Other Commitments [Line Items]          
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges     2,000 (189,000)  
Notional amount of derivative 25,000,000   25,000,000   50,000,000
Cash held as collateral 12,700,000   12,700,000    
Forward Contracts [Member]          
Other Commitments [Line Items]          
Notional amount of derivative 12,585,000   12,585,000   $ 8,065,000
Unrealized Gain (Loss) on Derivatives $ 69,000 $ 137,000 $ 50,000 $ 19,000  
Federal home loan bank 30-day | Interest rate swaps          
Other Commitments [Line Items]          
Derivative, Number of Instruments Held | derivative 11   11   23
Notional amount of derivative $ 32,147,000   $ 32,147,000   $ 124,784,000
Commercial and Industrial Sector [Member] | Interest rate swaps          
Other Commitments [Line Items]          
Derivative, Number of Instruments Held | derivative 74   74   65
Notional amount of derivative $ 364,113,000   $ 364,113,000   $ 351,668,000
Contract One [Member] | Interest rate swaps          
Other Commitments [Line Items]          
Notional amount of derivative 10,000,000   $ 10,000,000    
Contract One [Member] | Forward-Starting Interest Rate Swap          
Other Commitments [Line Items]          
Number of interest rate swap agreements | swap     1    
Notional amount of derivative $ 25,000,000   $ 25,000,000