SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended	12 Months Ended
	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