COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) derivative	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) derivative swap	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) derivative
Other Commitments [Line Items]
Loss Contingency Accrual	$ 0		$ 0		$ 0
Loss on Cash Flow Hedge Ineffectiveness	$ 0		$ 0		0
Number of interest rate swap agreements | swap			2
Derivative, Number of Instruments Held | derivative	2		2
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			$ 1,200,000
Unrealized Gain (Loss) on Derivatives	$ 60,000	$ 226,000	283,000	$ 610,000
Interest rate swaps
Other Commitments [Line Items]
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges			981,000	1,200,000
Notional amount of derivative	43,000,000		43,000,000		43,000,000
Cash held as collateral	9,100,000		9,100,000
Forward-Starting Interest Rate Swap
Other Commitments [Line Items]
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges			241,000	351,000
Notional amount of derivative	50,000,000		50,000,000		50,000,000
Cash held as collateral	1,200,000		1,200,000
Forward Contracts [Member]
Other Commitments [Line Items]
Notional amount of derivative	13,023,000		13,023,000		$ 15,125,000
Unrealized Gain (Loss) on Derivatives	$ 16,000	$ 0	$ 35,000	$ 0
Federal home loan bank 30-day | Interest rate swaps
Other Commitments [Line Items]
Derivative, Number of Instruments Held | derivative	30		30		0
Notional amount of derivative	$ 150,753,000		$ 150,753,000		$ 0
Commercial and Industrial Sector [Member] | Interest rate swaps
Other Commitments [Line Items]
Derivative, Number of Instruments Held | derivative	59		59		50
Notional amount of derivative	$ 296,045,000		$ 296,045,000		$ 266,263,000
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