LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan modifications (Details) - CARES Act Section 4013 Program For Loan Modifications [Member]	3 Months Ended
	Dec. 31, 2021 USD ($) loan	Sep. 30, 2021 USD ($) loan	Jun. 30, 2021 USD ($) loan	Mar. 31, 2021 USD ($) loan
Beginning Balance	1	8	17	44
Additional modifications granted | loan				6
Section 4013 CARES Act modifications returned to normal payment status (a) | loan		(7)	(9)	(33)
Ending Balance | loan	1	1	8	17
Beginning Balance	$ 9,423,000	$ 10,568,000	$ 13,641,000	$ 16,541,000
Additional modifications granted				10,622,000
Section 4013 CARES Act modifications returned to normal payment status (a)		(1,145,000)	(2,780,000)	(13,522,000)
Principal payments net of draws on active deferred loans			(293,000)
Ending Balance	$ 9,423,000	$ 9,423,000	$ 10,568,000	$ 13,641,000
Percent of Total Section 4013 CARES Act modifications	100.00%
Percent of Total Section 4013 CARES Act modifications to Total Loans	1.25%
Commercial and Industrial [Member]
Beginning Balance | loan		6	7	7
Additional modifications granted | loan				2
Section 4013 CARES Act modifications returned to normal payment status (a) | loan		(6)	(1)	(2)
Ending Balance | loan			6	7
Beginning Balance		$ 447,000	$ 590,000	$ 1,012,000
Additional modifications granted				190,000
Section 4013 CARES Act modifications returned to normal payment status (a)		$ (447,000)	(143,000)	(612,000)
Ending Balance			$ 447,000	$ 590,000
Percent of Total Section 4013 CARES Act modifications	0.00%
Percent of Total Section 4013 CARES Act modifications to Total Loans	0.00%
Commercial Real Estate
Beginning Balance | loan	1	2	8	35
Additional modifications granted | loan				2
Section 4013 CARES Act modifications returned to normal payment status (a) | loan		(1)	(6)	(29)
Ending Balance | loan	1	1	2	8
Beginning Balance	$ 9,423,000	$ 10,121,000	$ 12,894,000	$ 15,260,000
Additional modifications granted				10,414,000
Section 4013 CARES Act modifications returned to normal payment status (a)		(698,000)	(2,480,000)	(12,780,000)
Principal payments net of draws on active deferred loans			(293,000)
Ending Balance	$ 9,423,000	$ 9,423,000	$ 10,121,000	$ 12,894,000
Percent of Total Section 4013 CARES Act modifications	100.00%
Percent of Total Section 4013 CARES Act modifications to Total Loans	1.25%
Residential Real Estate
Beginning Balance | loan			1	2
Additional modifications granted | loan				1
Section 4013 CARES Act modifications returned to normal payment status (a) | loan			(1)	(2)
Ending Balance | loan				1
Beginning Balance			$ 155,000	$ 269,000
Additional modifications granted				16,000
Section 4013 CARES Act modifications returned to normal payment status (a)			$ (155,000)	(130,000)
Ending Balance				$ 155,000
Percent of Total Section 4013 CARES Act modifications	0.00%
Percent of Total Section 4013 CARES Act modifications to Total Loans	0.00%
Consumer [Member]
Beginning Balance | loan			1
Additional modifications granted | loan				1
Section 4013 CARES Act modifications returned to normal payment status (a) | loan			(1)
Ending Balance | loan				1
Beginning Balance			$ 2,000
Additional modifications granted				$ 2,000
Section 4013 CARES Act modifications returned to normal payment status (a)			$ (2,000)
Ending Balance				$ 2,000
Percent of Total Section 4013 CARES Act modifications	0.00%
Percent of Total Section 4013 CARES Act modifications to Total Loans	0.00%