LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 7,703	$ 8,114
Loans Past Due 90 Days or More and Still Accruing	6	4
Total recorded investment in loans	1,570,859	1,522,382
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,764	2,476
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	464	908
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	2,499	2,672
Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	4,727	6,056
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,566,132	1,516,326
Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	255,018	258,013
Commercial Mortgages
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	850,474	804,825
Commercial Mortgages | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual	24	34
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	80,705	82,435
Commercial Mortgages | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Commercial Mortgages | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Commercial Mortgages | Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Commercial Mortgages | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Commercial Mortgages | Construction | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	80,705	82,435
Commercial Mortgages | Commercial mortgages, other
Financing Receivable, Past Due [Line Items]
Non-accrual	3,676	3,844
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	769,769	722,390
Commercial Mortgages | Commercial mortgages, other | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	375	24
Commercial Mortgages | Commercial mortgages, other | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	224
Commercial Mortgages | Commercial mortgages, other | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,309	1,302
Commercial Mortgages | Commercial mortgages, other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,684	1,550
Commercial Mortgages | Commercial mortgages, other | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	768,085	720,840
Residential Mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	780	1,039
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	265,486	259,967
Residential Mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	530	580
Residential Mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	122	32
Residential Mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	401	652
Residential Mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,053	1,264
Residential Mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	264,433	258,703
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	199,881	199,577
Consumer Loans | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Non-accrual	831	790
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	70,436	70,854
Consumer Loans | Home equity lines and loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	208	256
Consumer Loans | Home equity lines and loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	83	69
Consumer Loans | Home equity lines and loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	578	424
Consumer Loans | Home equity lines and loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	869	749
Consumer Loans | Home equity lines and loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	69,567	70,105
Consumer Loans | Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	523	462
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	119,930	118,855
Consumer Loans | Indirect consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	630	1,179
Consumer Loans | Indirect consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	257	424
Consumer Loans | Indirect consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	178	255
Consumer Loans | Indirect consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	1,065	1,858
Consumer Loans | Indirect consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	118,865	116,997
Consumer Loans | Direct consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	15	13
Loans Past Due 90 Days or More and Still Accruing	0	0
Total recorded investment in loans	9,515	9,868
Consumer Loans | Direct consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	9	24
Consumer Loans | Direct consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	2	11
Consumer Loans | Direct consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	15	13
Consumer Loans | Direct consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	26	48
Consumer Loans | Direct consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	9,489	9,820
Commercial and industrial | Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Non-accrual	1,854	1,932
Loans Past Due 90 Days or More and Still Accruing	6	4
Total recorded investment in loans	254,782	257,618
Commercial and industrial | Commercial and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	12	413
Commercial and industrial | Commercial and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	148
Commercial and industrial | Commercial and Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	18	26
Commercial and industrial | Commercial and Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	30	587
Commercial and industrial | Commercial and Agricultural | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	254,752	257,031
Agricultural | Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	236	395
Agricultural | Commercial and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial and Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial and Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial and Agricultural | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment in loans	$ 236	$ 395