LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances by Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Allowance for loan losses:
Total ending allowance balance	$ 17,485	$ 19,928	$ 21,025	$ 20,676	$ 20,909	$ 20,924
Loans:
Total recorded investment in loans	1,621,993		1,522,382
Individually evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	1,326		3,030
Loans:
Total recorded investment in loans	7,349		11,647
Collectively evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	16,159		17,995
Loans:
Total recorded investment in loans	1,614,644		1,510,735
Commercial and Agricultural
Allowance for loan losses:
Total ending allowance balance	3,564	3,485	3,591	3,628	4,337	4,493
Loans:
Total recorded investment in loans	259,308		258,013
Commercial and Agricultural | Individually evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	1,239		1,394
Loans:
Total recorded investment in loans	1,925		2,427
Commercial and Agricultural | Collectively evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	2,325		2,197
Loans:
Total recorded investment in loans	257,383		255,586
Commercial Mortgages
Allowance for loan losses:
Total ending allowance balance	10,314	12,963	13,556	12,963	11,787	11,496
Loans:
Total recorded investment in loans	868,635		804,825
Commercial Mortgages | Individually evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	44		1,571
Loans:
Total recorded investment in loans	4,210		7,967
Commercial Mortgages | Collectively evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	10,270		11,985
Loans:
Total recorded investment in loans	864,425		796,858
Residential Mortgages
Allowance for loan losses:
Total ending allowance balance	1,714	1,606	1,803	1,791	2,115	2,079
Loans:
Total recorded investment in loans	277,567		259,967
Residential Mortgages | Individually evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	0		0
Loans:
Total recorded investment in loans	924		938
Residential Mortgages | Collectively evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	1,714		1,803
Loans:
Total recorded investment in loans	276,643		259,029
Consumer Loans
Allowance for loan losses:
Total ending allowance balance	1,893	$ 1,874	2,075	$ 2,294	$ 2,670	$ 2,856
Loans:
Total recorded investment in loans	216,483		199,577
Consumer Loans | Individually evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	43		65
Loans:
Total recorded investment in loans	290		315
Consumer Loans | Collectively evaluated for impairment
Allowance for loan losses:
Total ending allowance balance	1,850		2,010
Loans:
Total recorded investment in loans	$ 216,193		$ 199,262