DERIVATIVE FINANCIAL INSTRUMENTS - (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) item	Jun. 30, 2022 USD ($) item	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivative Financial Instruments
Net impact	$ 2,000	$ 0	$ 18,000	$ 0
Asset pledged
Derivative Financial Instruments
Available-for-sale securities pledged as collateral	2,265,000		2,265,000
Interest rate swap agreements
Derivative Financial Instruments
Aggregate notional amount	153,714,000		153,714,000		$ 155,214,000
Asset Derivatives, Notional Amount	76,857,000		76,857,000		77,607,000
Asset Derivatives, Fair Value	3,645,000		3,645,000		3,638,000
Liability Derivatives, Notional Amount	76,857,000		76,857,000		77,607,000
Liability Derivatives, Fair Value	$ 3,645,000		3,645,000		3,638,000
Number of derivative instruments originated | item	0	0
RPA Out
Derivative Financial Instruments
Asset Derivatives, Notional Amount	$ 7,141,000		7,141,000		7,200,000
Asset Derivatives, Fair Value	12,000		12,000		0
Liability Derivatives, Notional Amount	0		0		0
Liability Derivatives, Fair Value	0		0		0
RPA In
Derivative Financial Instruments
Asset Derivatives, Notional Amount	0		0		0
Asset Derivatives, Fair Value	0		0		0
Liability Derivatives, Notional Amount	10,000,000		10,000,000		10,000,000
Liability Derivatives, Fair Value	14,000		14,000		$ 19,000
Derivatives not designated as hedging instruments | Interest rate swap agreements
Derivative Financial Instruments
Interest rate swap	0		0
Increase (decrease) in interest income	$ 439,000	$ 220,000	$ 784,000	$ 537,000