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ALLOWANCE FOR CREDIT LOSSES - LOANS - Loan modifications to borrowers experiencing financial difficulty (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Total | $ 1,038,271,000 |  | $ 1,038,271,000 | $ 990,766,000 |
Loans, net of unearned income | 1,038,271,000 |  | 1,038,271,000 |  |
Current period gross charge-offs, Total |  |  | 3,641,000 | 1,849,000 | $ 294,000
Maturity date extensions |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized Cost Basis | 37,000 |  | 37,000 |  |
Extended Maturity and Interest Rate Reduction |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized Cost Basis | 6,243,000 |  | 6,243,000 |  |
Other commercial and industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Total | $ 159,424,000 |  | 159,424,000 |  |
Current period gross charge-offs, Total |  |  | 480,000 |  |
Residential mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Term extension date | 15 years |  |  |  |
Total | $ 174,670,000 |  | 174,670,000 | 297,971,000 |
Loans, net of unearned income | 174,670,000 |  | 174,670,000 |  |
Current period gross charge-offs, Total |  |  | 54,000 | $ 28,000 |
Residential mortgage | Maturity date extensions |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized Cost Basis | $ 37,000 |  | $ 37,000 |  |
Percentage of Total Class of Loans |  |  | 0.02% |  |
Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Term extension date | 3 months |  |  |  |
Deferred interest income, period |  | 7 months |  |  |
Deferred interest income |  | $ 303,000 |  |  |
Total | $ 240,286,000 |  | $ 240,286,000 |  |
Loans, net of unearned income | 240,286,000 |  | 240,286,000 |  |
Current period gross charge-offs, Total | 804,000 |  |  |  |
Other commercial real estate (non-owner occupied) | Maturity date extensions |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized Cost Basis | $ 6,243,000 |  | $ 6,243,000 |  |
Percentage of Total Class of Loans |  |  | 2.60% |  |

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