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DERIVATIVES - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) N | Jun. 30, 2019 USD ($) N | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 37,212,000 | $ 35,211,000 | $ 33,845,000 | $ 31,793,000 | $ 31,735,000 | $ 32,149,000 | $ 31,971,000 | $ 31,747,000 |  | $ 138,061,000 | $ 127,602,000 | $ 120,274,000
Pre-tax loss on the termination of the interest rate swaps |  |  |  |  |  |  |  |  |  | 842,000 |  |
Swap valuation allowance |  |  |  |  |  |  |  |  |  | 2,243,000 |  |
Accrued interest receivable | 21,589,000 |  |  |  | 22,495,000 |  |  |  |  | 21,589,000 | 22,495,000 |
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Swap valuation allowance | 130,000 |  |  |  |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument [Member] | Commercial Real Estate Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Swap valuation provision placed on non-accrual status |  |  |  |  |  |  |  |  |  | 2,100,000 |  |
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 |  |  |  | 270,000,000.0 |  |  |  |  | 230,000,000.0 | 270,000,000.0 |
Net interest income (expense) |  |  |  |  |  |  |  |  |  | 4,400,000 | 3,700,000 |
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 |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 230,000,000 |  |  |  | 270,000,000 |  |  |  |  | 230,000,000 | 270,000,000 |
Terminated Interest Rate Swap | 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 | 702,210,000 |  |  |  | $ 823,134,000 |  |  |  |  | 702,210,000 | $ 823,134,000 |
Accrued interest payable | 4,800,000 |  |  |  |  |  |  |  |  | 4,800,000 |  |
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest payable | 4,800,000 |  |  |  |  |  |  |  |  | 4,800,000 |  |
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest receivable | $ 4,800,000 |  |  |  |  |  |  |  |  | $ 4,800,000 |  |

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