LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Loans by Type (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 1,898,432,000	$ 1,895,848,000
Allowance for credit losses on loans	(20,172,000)	(20,035,000)	$ (20,023,000)	$ (19,208,000)
Loans, net	1,878,260,000	1,875,813,000
Net of deferred loan origination fees	4,005,000	4,136,000
Commercial | Commercial real estate - non-owner occupied
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	733,704,000	739,565,000
Allowance for credit losses on loans	(12,060,000)	(11,964,000)	(12,533,000)	(12,010,000)
Commercial | Commercial real estate - owner occupied
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	260,248,000	261,071,000
Allowance for credit losses on loans	(2,769,000)	(2,844,000)	(2,718,000)	(2,116,000)
Commercial | All other commercial loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	436,179,000	423,277,000
Allowance for credit losses on loans	(3,594,000)	(3,361,000)	(3,580,000)	(2,918,000)
Residential mortgage loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	402,248,000	408,009,000
Allowance for credit losses on loans	(1,281,000)	(1,356,000)	(769,000)	(1,764,000)
Consumer loans
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	66,053,000	63,926,000
Allowance for credit losses on loans	$ (468,000)	$ (510,000)	$ (423,000)	$ (400,000)