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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) segment branchOffice county shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Jan. 01, 2024 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of branch offices | branchOffice | 53 |  |  |  |
Number of counties where branch offices are located | county | 15 |  |  |  |
Investment loans excluding accrued interest | $ 21,500,000 | $ 18,400,000 |  |  |
Accrued interest location | Interest Receivable | Interest Receivable |  |  |
Threshold for loans individually analyzed for impairment | $ 250,000 |  |  |  |
Investment in limited partnerships | 13,000,000.0 | $ 12,200,000 |  |  |
Commitment to fund limited partnerships | 2,800,000 | 3,900,000 |  |  |
Balance of real estate owned | 384,000 | 100,000 |  |  |
Loan servicing fees | $ 1,200,000 | $ 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 | $ 2,200,000 | $ 2,700,000 |  |  |
Unpaid principal balances | 333,100,000 | 364,300,000 |  |  |
Escrow deposit | 1,500,000 | 1,700,000 |  |  |
Bank owned life insurance | 109,114,000 | 108,407,000 |  |  |
Accumulated impairment loss | $ 0 | $ 0 | $ 0 |  |
Treasury stock (in shares) | shares | 473,120 | 475,902 |  |  |
Shares purchased under director deferred compensation plan included in treasury stock (in shares) | shares | 184,019 | 186,801 |  |  |
Number of reportable operating segments | segment | 1 |  |  |  |
Equity | $ 649,793,000 | $ 568,887,000 | 704,906,000 |  | $ 657,184,000
Retained Earnings |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity | 692,760,000 | 646,100,000 | $ 583,134,000 |  | 529,005,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity |  |  |  |  | (6,951,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity |  |  |  |  | $ (6,951,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Subsequent Event |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity |  |  |  | $ 1,000,000 |
Interest Rate Swap |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Notional amount | 826,400,000 | 760,500,000 |  |  |
Fair value of interest rate swap asset | 27,200,000 | 36,900,000 |  |  |
Fair value of interest rate swap liability | 27,200,000 | 36,900,000 |  |  |
Life Insurance | Officer |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Bank owned life insurance | 104,800,000 | 102,500,000 |  |  |
Deferred Compensation | Officer |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Bank owned life insurance | $ 4,300,000 | $ 5,900,000 |  |  |
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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