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DERIVATIVES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Derivative [Line Items] |  |  |  |  |  |
Net interest income (expense) | $ 38,921,000 |  | $ 42,893,000 | $ 82,899,000 | $ 82,515,000 |
Swap valuation allowance |  |  |  |  | 673,000 |
Accrued interest receivable | 20,865,000 |  |  | 20,865,000 |  | $ 25,157,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 310,000,000.0 |  |  | 310,000,000.0 |  | 290,000,000.0
Unrealized after-tax gain of accumulated other comprehensive income (loss) |  | $ 167,000 |  |  |  |
Unrealized gain |  |  |  | 11,248,000 |  | 3,290,000
Net interest income (expense) | 1,100,000 |  | $ (679,000) | 2,000,000.0 | $ (1,700,000) |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 310,000,000 |  |  | 310,000,000 |  | 290,000,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 585,234,000 |  |  | 585,234,000 |  | 612,211,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Accrued interest payable | $ 368,000 |  |  | $ 368,000 |  | $ 1,100,000

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