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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 |  |

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