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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended |  |
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Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) county segment branchOffice shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Jan. 01, 2024 USD ($) | Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of branch offices | branchOffice |  | 54 |  |  |  |
Number of counties where branch offices are located | county |  | 15 |  |  |  |
Investment loans excluding accrued interest |  | $ 20,300,000 | $ 21,500,000 |  |  |
Accrued interest location |  | Interest Receivable | Interest Receivable |  |  |
Threshold for loans individually analyzed for impairment |  | $ 250,000 |  |  |  |
Investment in limited partnerships |  | 7,600,000 | $ 6,200,000 |  |  |
Investments in tax credit structures |  | $ 7,200,000 | 6,800,000 |  |  |
Investments in tax credit structures, location |  | Other Assets |  |  |  |
Commitments to investments in tax credit structures |  | $ 3,800,000 | 2,800,000 |  |  |
Commitments to investments in tax credit structures, fulfillment period |  | 15 years |  |  |  |
Amortization expense of investments in tax credit structures |  | $ 794,000 | $ 592,000 |  |  |
Amortization expense of investments in tax credit structures, statements of income location |  | Income Tax Expense (Benefit) | Other Interest and Dividend Income |  |  |
Tax credits and other benefits from investment tax credit |  | $ 807,000 | $ 713,000 |  |  |
Tax credits and other benefits from investment tax credit, statements of income, location |  | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) |  |  |
Amortization expense of investments in tax credit structures, statements of cash flows location |  | Net Cash Provided by (Used in) Operating Activities | Net Cash Provided by (Used in) Operating Activities |  |  |
Tax credits and other benefits from investment tax credit, statements of cash flows, location |  | Net Cash Provided by (Used in) Operating Activities | Net Cash Provided by (Used in) Operating Activities |  |  |
Balance of real estate owned |  | $ 284,000 | $ 384,000 |  |  |
Loan servicing fees |  | $ 1,100,000 | $ 1,200,000 | $ 1,200,000 |  |
Loan servicing fees location |  | Mortgage banking income (loss) | Mortgage banking income (loss) | Mortgage banking income (loss) |  |
Mortgage servicing rights |  | $ 1,900,000 | $ 2,200,000 |  |  |
Unpaid principal balances |  | 313,000,000.0 | 333,100,000 |  |  |
Escrow deposit |  | 1,700,000 | 1,500,000 |  |  |
Bank owned life insurance |  | 113,320,000 | 109,114,000 |  |  |
Accumulated impairment loss |  | $ 0 | $ 0 | $ 0 |  |
Treasury stock (in shares) | shares |  | 469,239 | 473,120 |  |  |
Shares purchased under director deferred compensation plan included in treasury stock (in shares) | shares |  | 180,138 | 184,019 |  |  |
Loss contingency expense | $ 4,500,000 |  |  |  |  |
Number of reportable operating segments | segment |  | 1 |  |  |  |
Equity |  | $ 683,911,000 | $ 649,793,000 | 568,887,000 |  | $ 704,906,000
Retained Earnings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity |  | 736,412,000 | 692,760,000 | $ 646,100,000 |  | $ 583,134,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity |  |  | (532,000) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity |  |  | (532,000) |  | $ (532,000) |
Interest Rate Swap, Customers and Counterparties |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Notional amount |  | 744,800,000 | 826,400,000 |  |  |
Fair value of interest rate swap asset |  | 25,400,000 | 27,200,000 |  |  |
Fair value of interest rate swap liability |  | 25,400,000 | 27,200,000 |  |  |
Interest Rate Swap, Risk Participation |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Notional amount |  | 4,900,000 |  |  |  |
Life Insurance | Officer |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Bank owned life insurance |  | 107,300,000 | 104,800,000 |  |  |
Deferred Compensation | Officer |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Bank owned life insurance |  | $ 6,000,000.0 | $ 4,300,000 |  |  |
Premises and Improvements | Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  | 5 years |  |  |  |
Premises and Improvements | Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  | 40 years |  |  |  |
Furniture Assets | Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  | 3 years |  |  |  |
Furniture Assets | Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  | 7 years |  |  |  |

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