COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) derivative	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) derivative swap	Sep. 30, 2017 USD ($)	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
Unrealized Gain (Loss) on Derivatives	$ (46,000)	$ (60,000)	$ (38,000)	$ (283,000)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			412,000
Interest rate swaps
Other Commitments [Line Items]
Cash held as collateral	4,700,000		4,700,000
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges			689,000	981,000
Notional amount of derivative	43,000,000		43,000,000		43,000,000
Forward-Starting Interest Rate Swap
Other Commitments [Line Items]
Cash held as collateral	15,700,000		15,700,000
Derivative Instrument Payment Of Interest Rate Swaps Designated As Cash Flow Hedges			24,000	(241,000)
Notional amount of derivative	25,000,000		25,000,000		50,000,000
Forward Contracts [Member]
Other Commitments [Line Items]
Notional amount of derivative	10,188,000		10,188,000		$ 8,065,000
Unrealized Gain (Loss) on Derivatives	$ 49,000	$ 16,000	$ 99,000	$ 35,000
Federal home loan bank 30-day | Interest rate swaps
Other Commitments [Line Items]
Derivative, Number of Instruments Held | derivative	8		8		23
Notional amount of derivative	$ 56,720,000		$ 56,720,000		$ 124,784,000
Commercial and Industrial Sector [Member] | Interest rate swaps
Other Commitments [Line Items]
Derivative, Number of Instruments Held | derivative	75		75		65
Notional amount of derivative	$ 396,606,000		$ 396,606,000		$ 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]
Notional amount of derivative	$ 25,000,000		$ 25,000,000
Number of interest rate swap agreements | swap			1