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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 17,948	$ 18,008
Loans Past Due 90 Days or More and Still Accruing	8	7
Aging of the recorded investment in loans past due [Abstract]
Past Due	17,065	14,370
Loans Not Past Due	1,307,155	1,298,533
Total recorded investment in loans	1,324,220	1,312,903
30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	5,615	4,672
60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,281	1,668
90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	8,169	8,029
Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	236,650	230,922
Commercial Mortgages
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	661,661	650,570
Commercial Mortgages | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual	73	80
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Loans Not Past Due	41,073	44,082
Total recorded investment in loans	41,073	44,082
Commercial Mortgages | Construction | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Commercial Mortgages | Construction | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Commercial Mortgages | Construction | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Commercial Mortgages | Commercial mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	8,247	8,407
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	5,893	2,883
Loans Not Past Due	614,695	603,605
Total recorded investment in loans	620,588	606,488
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,385	440
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,211	277
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,297	2,165
Residential mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	2,265	2,155
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,849	2,775
Loans Not Past Due	190,420	186,099
Total recorded investment in loans	193,269	188,874
Residential mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,432	1,016
Residential mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	286	804
Residential mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,131	956
Consumer Loans
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	232,640	242,537
Consumer Loans | Credit cards
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due		0
Loans Not Past Due		0
Total recorded investment in loans		0
Consumer Loans | Credit cards | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due		0
Consumer Loans | Credit cards | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due		0
Consumer Loans | Credit cards | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due		0
Consumer Loans | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Non-accrual	638	641
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	637	653
Loans Not Past Due	87,784	91,412
Total recorded investment in loans	88,421	92,065
Consumer Loans | Home equity lines and loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	368	353
Consumer Loans | Home equity lines and loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	174	151
Consumer Loans | Home equity lines and loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	95	149
Consumer Loans | Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	767	571
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,642	2,278
Loans Not Past Due	128,167	133,088
Total recorded investment in loans	129,809	135,366
Consumer Loans | Indirect consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,050	1,546
Consumer Loans | Indirect consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	216	377
Consumer Loans | Indirect consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	376	355
Consumer Loans | Direct consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	7	7
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	60	49
Loans Not Past Due	14,350	15,057
Total recorded investment in loans	14,410	15,106
Consumer Loans | Direct consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	33	32
Consumer Loans | Direct consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	21	10
Consumer Loans | Direct consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	6	6
Commercial and industrial | Commercial and agricultural
Financing Receivable, Past Due [Line Items]
Non-accrual	5,951	6,147
Loans Past Due 90 Days or More and Still Accruing	8	7
Aging of the recorded investment in loans past due [Abstract]
Past Due	5,984	5,732
Loans Not Past Due	230,376	224,916
Total recorded investment in loans	236,360	230,648
Commercial and industrial | Commercial and agricultural | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	347	1,285
Commercial and industrial | Commercial and agricultural | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,373	49
Commercial and industrial | Commercial and agricultural | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	4,264	4,398
Agricultural | Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Loans Not Past Due	290	274
Total recorded investment in loans	290	274
Agricultural | Commercial and agricultural | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Agricultural | Commercial and agricultural | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Agricultural | Commercial and agricultural | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	$ 0	$ 0

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