SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment branchOffice county shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares
Summary Of Significant Accounting Policies [Line Items]
Number of branch offices | branchOffice	52
Number of counties where branch offices are located | county	15
Investment loans excluding accrued interest	$ 18,400,000	$ 10,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable	Interest Receivable
Threshold for loans individually analyzed for impairment	$ 250,000
Investment in limited partnerships	12,200,000	$ 9,400,000
Commitment to fund limited partnerships	3,900,000	2,200,000
Balance of real estate owned	100,000	196,000
Loan servicing fees	$ 1,200,000	$ 1,200,000	$ 1,200,000
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage banking income	Mortgage banking income	Mortgage banking income
Mortgage servicing rights	$ 2,700,000	$ 2,400,000
Unpaid principal balances	364,300,000	375,400,000
Escrow deposit	1,700,000	1,700,000
Bank owned life insurance	108,407,000	97,652,000
Goodwill, Impaired, Accumulated Impairment Loss	$ 0	$ 0	$ 0
Treasury stock (in shares) | shares	475,902	476,816
Shares purchased under director deferred compensation plan included in treasury stock (in shares) | shares	186,801	187,715
Repurchased common shares (in shares) | shares			289,101
Weighted average price (in USD per share) | $ / shares			$ 34.63
Number of reportable operating segments | segment	1
Interest Rate Swap
Summary Of Significant Accounting Policies [Line Items]
Notional amount	$ 760,500,000	$ 796,000,000.0
Fair value of interest rate swap asset	36,900,000	14,300,000
Fair value of interest rate swap liability	36,900,000	14,300,000
Amount of risk participation transactions	0	4,600,000
Life Insurance | Officer
Summary Of Significant Accounting Policies [Line Items]
Bank owned life insurance	102,500,000	91,100,000
Deferred Compensation | Officer
Summary Of Significant Accounting Policies [Line Items]
Bank owned life insurance	$ 5,900,000	$ 6,600,000
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