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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract	Dec. 31, 2022 USD ($) troubled_debt_restructuring	Jun. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	$ 22,973	$ 17,217	$ 22,973	$ 17,217	$ 17,939	$ 23,164
Interest income, nonaccrual loans, payoffs	420		505
Outstanding commitments	0		0
Remaining borrowing capacity	37		$ 37
Impaired financing receivable, recorded investment		$ 29,714		$ 29,714	26,823
Financing receivable, troubled debt restructuring					$ 7,788
Number of troubled debt restructuring | troubled_debt_restructuring					1
Investment in troubled debt restructuring					$ 15
Number of Contracts		7		21	1
Total amount of TDR commitments meeting TDR criteria					$ 26
Financing receivable, modifications, available line of credit loan, amount					484
Number of modifications | contract		0		0
Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring					6,904
TDR Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring					7,018
7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring					12,901
Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring					5,171
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments		$ 526		$ 526
Acquired Loans | Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring					7,000
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days			90 days
Closed End Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days			120 days
Real Estate and Open Ended Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days			180 days
Unfunded Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	1,571		$ 1,571		0	1,544
Commercial/Agricultural Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	$ 18,855	13,782	$ 18,855	13,782	14,085	$ 18,933
Impaired financing receivable, recorded investment		$ 18,662		$ 18,662	$ 16,849
Number of Contracts | contract		2		7
Commercial/Agricultural Real Estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments		$ 665		$ 665
Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan-to-value ratio (as a percent)	75.00%		75.00%

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