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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 19,516	$ 12,254
Loans Past Due 90 Days or More and Still Accruing	57	19
Aging of the recorded investment in loans past due [Abstract]
Past Due	12,548	14,367
Loans Not Past Due	1,279,875	1,301,242
Total recorded investment in loans	1,292,423	1,315,609
30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	7,811	10,688
60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	992	1,207
90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,745	2,472
Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	207,469	203,412
Commercial Mortgages
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	650,602	662,988
Commercial Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	94	109
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	39,734	54,626
Total recorded investment in loans	39,734	54,626
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, Recorded Investment, Past Due [Line Items]
Non-accrual	13,580	5,529
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	4,806	6,600
Loans Not Past Due	606,062	601,762
Total recorded investment in loans	610,868	608,362
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,593	6,273
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	87	158
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,126	169
Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,545	2,655
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,490	3,746
Loans Not Past Due	180,857	179,479
Total recorded investment in loans	184,347	183,225
Residential mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,894	2,204
Residential mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	557	516
Residential mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,039	1,026
Consumer Loans
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	250,005	265,984
Consumer Loans | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans Past Due 90 Days or More and Still Accruing	0	9
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	13
Loans Not Past Due	0	1,437
Total recorded investment in loans	0	1,450
Consumer Loans | Credit cards | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	1
Consumer Loans | Credit cards | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	3
Consumer Loans | Credit cards | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	9
Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	722	1,183
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,159	1,106
Loans Not Past Due	93,629	97,360
Total recorded investment in loans	94,788	98,466
Consumer Loans | Home equity lines and loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	886	279
Consumer Loans | Home equity lines and loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	22	97
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	251	730
Consumer Loans | Indirect consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	526	693
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,514	2,266
Loans Not Past Due	137,515	147,540
Total recorded investment in loans	139,029	149,806
Consumer Loans | Indirect consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,128	1,511
Consumer Loans | Indirect consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	185	319
Consumer Loans | Indirect consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	201	436
Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7	37
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	143	204
Loans Not Past Due	16,045	16,058
Total recorded investment in loans	16,188	16,262
Consumer Loans | Direct consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	89	120
Consumer Loans | Direct consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	54	53
Consumer Loans | Direct consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	31
Commercial and industrial | Commercial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,042	2,048
Loans Past Due 90 Days or More and Still Accruing	57	10
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,436	416
Loans Not Past Due	205,822	202,667
Total recorded investment in loans	207,258	203,083
Commercial and industrial | Commercial and agricultural | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,221	284
Commercial and industrial | Commercial and agricultural | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	87	61
Commercial and industrial | Commercial and agricultural | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	128	71
Agricultural | Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	16
Loans Not Past Due	211	313
Total recorded investment in loans	211	329
Agricultural | Commercial and agricultural | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	16
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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