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DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)	3 Months Ended		9 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Asset pledged
Derivative Financial Instruments
Available-for-sale securities pledged as collateral	$ 7,069,000		$ 7,069,000
Interest rate swap agreements
Derivative Financial Instruments
Aggregate notional amount	123,990,000		123,990,000		$ 135,740,000
Asset Derivatives, Notional Amount	61,995,000		61,995,000		67,870,000
Asset Derivatives, Fair Value	3,902,000		3,902,000		6,566,000
Liability Derivatives, Notional Amount	61,995,000		61,995,000		67,870,000
Liability Derivatives, Fair Value	3,902,000		3,902,000		$ 6,566,000
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	$ 335,000	$ 351,000	$ 1,013,000	$ 351,000