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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 |  |

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