DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Asset pledged
Derivative Financial Instruments
Available-for-sale securities pledged as collateral	$ 2,338,000		$ 2,338,000
Interest rate swap agreements
Derivative Financial Instruments
Aggregate notional amount	115,050,000		115,050,000		$ 123,094,000
Asset Derivatives, Notional Amount	57,525,000		57,525,000		61,547,000
Asset Derivatives, Fair Value	1,619,000		1,619,000		3,104,000
Liability Derivatives, Notional Amount	57,525,000		57,525,000		61,547,000
Liability Derivatives, Fair Value	1,619,000		1,619,000		$ 3,104,000
Derivatives not designated as hedging instruments | Interest rate swap agreements
Derivative Financial Instruments
Interest rate swap	0	$ 0	0	$ 0
Increase (decrease) in interest income	$ (220,000)	$ (340,000)	$ (537,000)	$ (678,000)