DERIVATIVE FINANCIAL INSTRUMENTS - (Details)	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivative Financial Instruments
Net impact	$ 16,000	$ 0
Asset pledged
Derivative Financial Instruments
Available-for-sale securities pledged as collateral	2,302,000
Interest rate swap agreements
Derivative Financial Instruments
Aggregate notional amount	154,878,000		$ 155,214,000
Asset Derivatives, Notional Amount	77,439,000		77,607,000
Asset Derivatives, Fair Value	3,145,000		3,638,000
Liability Derivatives, Notional Amount	77,439,000		77,607,000
Liability Derivatives, Fair Value	$ 3,145,000		3,638,000
Number of derivative instruments originated	0	0
RPA Out
Derivative Financial Instruments
Asset Derivatives, Notional Amount	$ 7,200,000		7,200,000
Asset Derivatives, Fair Value	21,000		0
Liability Derivatives, Notional Amount	0		0
Liability Derivatives, Fair Value	0		0
RPA In
Derivative Financial Instruments
Asset Derivatives, Notional Amount	0		0
Asset Derivatives, Fair Value	0		0
Liability Derivatives, Notional Amount	10,000,000		10,000,000
Liability Derivatives, Fair Value	24,000		$ 19,000
Derivatives not designated as hedging instruments | Interest rate swap agreements
Derivative Financial Instruments
Interest rate swap	0
Increase (decrease) in interest income	$ 345,000	$ (317,000)