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DERIVATIVES (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 13, 2016 USD ($) interest_rate_swap | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Number of interest rate swaps terminated (interest rate swap) | interest_rate_swap | 3 |  |
Cash Flow Hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gain within accumulated other comprehensive income, to be reclassified into earnings | $ 1,300 |  |
Estimated net amount of gains expected to be reclassified into earnings within the next twelve months |  | $ 195 |
Fair Value Hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate notional amount of the hedged items |  | 86,500 | $ 87,600
Fair value of aggregate notional amount of the hedged items, unrealized loss |  | 299 | 1,600
Available-for-sale Securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of aggregate notional amount of the hedged items, unrealized loss |  | 2,400 | 1,400
Available-for-sale Securities | Fair Value Hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate notional amount of the hedged items |  | 50,000 | 50,000
Fair value of aggregate notional amount of the hedged items, unrealized loss |  | $ 2,400 | $ 1,400

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