LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Loans by Type (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	$ 1,830,670,000		$ 1,740,040,000
Allowance for credit losses on loans	(18,085,000)	$ (19,056,000)	(16,615,000)	$ (16,170,000)	$ (14,547,000)	$ (13,537,000)
Purchased credit impaired loans			1,027,000
Loans, net	1,812,585,000		1,723,425,000
Commercial
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total			1,111,498,000
Allowance for credit losses on loans			(11,298,000)	$ (10,238,000)	$ (8,894,000)	$ (8,293,000)
Commercial | Commercial real estate - non-owner occupied
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	737,287,000		675,597,000
Allowance for credit losses on loans	(10,335,000)	(10,603,000)	(6,305,000)
Commercial | Commercial real estate - owner occupied
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	231,112,000		205,910,000
Allowance for credit losses on loans	(1,864,000)	(2,025,000)	(1,942,000)
Commercial | All other commercial loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	395,703,000		410,077,000
Allowance for credit losses on loans	(3,552,000)	(3,686,000)	(4,142,000)
Residential mortgage loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	410,013,000		393,582,000
Allowance for credit losses on loans	(1,993,000)	(2,464,000)	(2,751,000)
Consumer loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans and Leases Receivable, Gross, Total	56,555,000		54,874,000
Allowance for credit losses on loans	$ (341,000)	$ (278,000)	$ (475,000)