LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	$ 19,928	$ 20,909	$ 21,025	$ 20,924
Charge-offs	(831)	(227)	(1,029)	(416)
Recoveries	132	144	378	577
Net recoveries (charge-offs)	(699)	(83)	(651)	161
Provision	(1,744)	(150)	(2,889)	(409)
Ending balance	17,485	20,676	17,485	20,676
Commercial and Agricultural
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	3,485	4,337	3,591	4,493
Charge-offs	(16)	(25)	(20)	(25)
Recoveries	23	10	30	275
Net recoveries (charge-offs)	7	(15)	10	250
Provision	72	(694)	(37)	(1,115)
Ending balance	3,564	3,628	3,564	3,628
Commercial Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	12,963	11,787	13,556	11,496
Charge-offs	(687)	0	(687)	0
Recoveries	1	1	2	1
Net recoveries (charge-offs)	(686)	1	(685)	1
Provision	(1,963)	1,175	(2,557)	1,466
Ending balance	10,314	12,963	10,314	12,963
Residential Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	1,606	2,115	1,803	2,079
Charge-offs	0	(46)	0	(71)
Recoveries	0	10	0	10
Net recoveries (charge-offs)	0	(36)	0	(61)
Provision	108	(288)	(89)	(227)
Ending balance	1,714	1,791	1,714	1,791
Consumer Loans
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	1,874	2,670	2,075	2,856
Charge-offs	(128)	(156)	(322)	(320)
Recoveries	108	123	346	291
Net recoveries (charge-offs)	(20)	(33)	24	(29)
Provision	39	(343)	(206)	(533)
Ending balance	$ 1,893	$ 2,294	$ 1,893	$ 2,294