LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	$ 6,802
Non-accrual	7,731	$ 8,178
Loans Past Due 90 Days or More and Still Accruing	6	1
Financing receivable	1,873,701	1,829,448
Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	6,569	6,603
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	4,837	4,084
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	174	1,045
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	1,558	1,474
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	1,867,132	1,822,845
Construction
Financing Receivable, Past Due [Line Items]
Financing receivable	118,660
Commercial mortgages, other
Financing Receivable, Past Due [Line Items]
Financing receivable	917,637
Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Financing receivable	84,537
Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Financing receivable	211,270
Direct consumer loans
Financing Receivable, Past Due [Line Items]
Financing receivable	11,146
Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Financing receivable	244,507	252,293
Commercial Mortgages
Financing Receivable, Past Due [Line Items]
Financing receivable	1,036,297	996,913
Commercial Mortgages | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	0
Non-accrual	0	5
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	118,660	108,243
Commercial Mortgages | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	2,284	0
Commercial Mortgages | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	2,284	0
Commercial Mortgages | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Commercial Mortgages | Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Commercial Mortgages | Construction | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	116,376	108,243
Commercial Mortgages | Commercial mortgages, other
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	3,611
Non-accrual	3,647	3,928
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	917,637	888,670
Commercial Mortgages | Commercial mortgages, other | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	543	1,544
Commercial Mortgages | Commercial mortgages, other | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	246	1,058
Commercial Mortgages | Commercial mortgages, other | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Commercial Mortgages | Commercial mortgages, other | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	297	486
Commercial Mortgages | Commercial mortgages, other | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	917,094	887,126
Residential Mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	1,036
Non-accrual	1,036	986
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	285,944	285,672
Residential Mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	1,402	2,363
Residential Mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	933	1,360
Residential Mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	57	709
Residential Mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	412	294
Residential Mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	284,542	283,309
Consumer Loans
Financing Receivable, Past Due [Line Items]
Financing receivable	306,953	294,570
Consumer Loans | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	866
Non-accrual	866	760
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	84,537	81,401
Consumer Loans | Home equity lines and loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	886	756
Consumer Loans | Home equity lines and loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	261	193
Consumer Loans | Home equity lines and loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	57	121
Consumer Loans | Home equity lines and loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	568	442
Consumer Loans | Home equity lines and loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	83,651	80,645
Consumer Loans | Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	556
Non-accrual	556	540
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	211,270	202,124
Consumer Loans | Indirect consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	1,353	1,840
Consumer Loans | Indirect consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	1,036	1,397
Consumer Loans | Indirect consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	52	193
Consumer Loans | Indirect consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	265	250
Consumer Loans | Indirect consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	209,917	200,284
Consumer Loans | Direct consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	3
Non-accrual	3	13
Loans Past Due 90 Days or More and Still Accruing	0	0
Financing receivable	11,146	11,045
Consumer Loans | Direct consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	10	22
Consumer Loans | Direct consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	10	2
Consumer Loans | Direct consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	19
Consumer Loans | Direct consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	1
Consumer Loans | Direct consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	11,136	11,023
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing receivable	244,174
Commercial and industrial | Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Non-accrual with no allowance for credit losses	730
Non-accrual	1,623	1,946
Loans Past Due 90 Days or More and Still Accruing	6	1
Financing receivable	244,174	252,044
Commercial and industrial | Commercial and Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	91	78
Commercial and industrial | Commercial and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	67	74
Commercial and industrial | Commercial and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	8	3
Commercial and industrial | Commercial and Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	16	1
Commercial and industrial | Commercial and Agricultural | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	244,083	251,966
Agricultural
Financing Receivable, Past Due [Line Items]
Financing receivable	333
Agricultural | Commercial and Agricultural
Financing Receivable, Past Due [Line Items]
Financing receivable	333	249
Agricultural | Commercial and Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Agricultural | Commercial and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Agricultural | Commercial and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Agricultural | Commercial and Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	0	0
Agricultural | Commercial and Agricultural | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable	$ 333	$ 249