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DERIVATIVES (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) N | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) N | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) N
Derivative [Line Items] |  |  |  |  |  |
Net interest income (expense) | $ 28,142,000 |  | $ 29,992,000 | $ 85,778,000 | $ 82,555,000 |
Amount of gain/(loss) recognized in OCI (effective portion) | 843,000 |  | 222,000 | 2,412,000 | 1,023,000 |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | $ 230,000,000 |  |  | $ 230,000,000 |  | $ 180,000,000
Weighted average pay rate | 2.04% |  |  | 2.04% |  | 1.64%
Weighted average receive rate | 2.07% |  |  | 2.07% |  | 1.33%
Weighted average maturity |  |  |  | 2 years 10 months 24 days |  | 2 years 3 months
Unrealized gain, net |  |  |  | $ 3,536,000 |  | $ 1,394,000
Number of contracts | N | 11 |  |  | 11 |  | 9
Net interest income (expense) | $ 124,000 |  | (150,000) | $ 137,000 | (763,000) |
Amount of gain/(loss) recognized in OCI (effective portion) | 514,000 |  | 131,000 | 1,597,000 | 605,000 |
Amount of gain/(loss) reclassified from OCI to interest expense | 20,000 |  | 0 | 64,000 | 0 |
Amount of gain/(loss) recognized in other non-interest expense | 0 |  | $ 0 | 0 | $ 0 |
Unrealized after-tax gain of accumulated other comprehensive income loss |  | $ 220,000 |  |  |  |
Interest income | 31,000 |  |  | 93,000 |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 230,000,000 |  |  | 230,000,000 |  | $ 180,000,000
Fair Value | 3,536,000 |  |  | 3,536,000 |  | 1,394,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | $ 425,151,000 |  |  | $ 425,151,000 |  | $ 317,363,000
Weighted average pay rate | 4.28% |  |  | 4.28% |  | 4.11%
Weighted average receive rate | 4.05% |  |  | 4.05% |  | 3.43%
Weighted average maturity |  |  |  | 7 years 6 months |  | 7 years 7 months 6 days
Number of contracts | N | 57 |  |  | 57 |  | 42
Fair Value | $ 12,027,000 |  |  | $ 12,027,000 |  | $ 3,131,000

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