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DERIVATIVES - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) N | Jun. 30, 2019 USD ($) N | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Net interest income (expense) | $ 33,845,000 | $ 31,971,000 |  |  | $ 65,638,000 | $ 63,718,000 |
Pre-tax loss on the termination of the interest rate swaps | 842,000 |  |  |  | 842,000 |  |
Accrued interest receivable | 23,117,000 |  |  |  | 23,117,000 |  | $ 22,495,000
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | 15,000,000.0 |  |  |  | 15,000,000.0 |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | 230,000,000.0 |  |  |  | 230,000,000.0 |  | 270,000,000.0
Net interest income (expense) | 1,100,000 | 1,100,000 |  |  | 2,300,000 | 1,300,000 |
Unrealized after-tax gain of accumulated other comprehensive income (loss) |  |  | $ 26,000 | $ 189,000 |  |  |
Interest income |  | $ 9,000 |  |  |  | $ 80,000 |
Derivative number of instruments terminated | N |  |  | 3 | 4 |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | 230,000,000 |  |  |  | 230,000,000 |  | 270,000,000
Terminated Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | 40,000,000.0 |  |  |  | 40,000,000.0 |  |
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | 778,584,000 |  |  |  | 778,584,000 |  | $ 823,134,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | 4,700,000 |  |  |  | 4,700,000 |  |
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Accrued interest payable | $ 4,700,000 |  |  |  | $ 4,700,000 |  |

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