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DERIVATIVES - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) N | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) N | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 31,735,000 | $ 32,149,000 | $ 31,971,000 | $ 31,747,000 | $ 30,914,000 | $ 30,085,000 | $ 29,268,000 | $ 30,007,000 | $ 127,602,000 | $ 120,274,000 | $ 115,163,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 270,000,000.0 |  |  |  | $ 245,000,000.0 |  |  |  | 270,000,000.0 | 245,000,000.0 |
Net interest income (expense) |  |  |  |  |  |  |  |  | (3,700,000) | 953,000 |
Unrealized after-tax gain of accumulated other comprehensive income (loss) |  |  |  | $ 26,000 |  |  | $ 189,000 |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 89,000 | $ 223,000 |
Derivative number of instruments terminated | N |  |  |  | 3 |  |  | 4 |  |  |  |

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