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DERIVATIVES - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) N | Jun. 30, 2019 USD ($) N | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Net interest income (expense) | $ 35,211,000 | $ 32,149,000 |  |  | $ 100,849,000 | $ 95,867,000 |  |
Pre-tax loss on the termination of the interest rate swaps |  |  |  |  | 842,000 |  |  |
Accrued interest receivable | 22,790,000 |  |  |  | 22,790,000 |  |  | $ 22,495,000
Not Designated as Hedging Instrument [Member] | Commercial Real Estate Loan [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Swap valuation provision placed on non-accrual status | 1,400,000 |  |  |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 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) | 1,000,000.0 | $ 1,100,000 |  |  | 3,300,000 | $ 2,400,000 |  |
Unrealized after-tax gain of accumulated other comprehensive income (loss) |  |  | $ 26,000 | $ 189,000 |  |  |  |
Interest income | 5,000 |  |  |  | 85,000 |  |  |
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 |
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 730,966,000 |  |  |  | 730,966,000 |  |  | $ 823,134,000
Accrued interest payable | 4,700,000 |  |  |  | 4,700,000 |  |  |
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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