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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 12,629	$ 17,324
Loans Past Due 90 Days or More and Still Accruing	14	29
Aging of the recorded investment in loans past due [Abstract]
Past Due	14,673	14,076
Loans Not Past Due	1,309,849	1,300,714
Total recorded investment in loans	1,324,522	1,315,582
30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	11,087	7,639
60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,032	2,605
90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,554	3,832
Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	792
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	792
Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	192,958	199,576
Commercial and agricultural | Loans acquired with deteriorated credit quality
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans		0
Commercial Mortgages
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	667,575	646,174
Commercial Mortgages | Loans acquired with deteriorated credit quality
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans		792
Commercial Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	115	135
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	50,504	45,688
Total recorded investment in loans	50,504	45,688
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 | Construction | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Commercial Mortgages | Commercial mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	5,849	6,520
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,598	3,262
Loans Not Past Due	614,473	596,432
Total recorded investment in loans	617,071	600,486
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,137	2,399
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	25	115
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	436	748
Commercial Mortgages | Commercial mortgages | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	792
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	792
Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,654	3,160
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,780	3,812
Loans Not Past Due	186,381	191,125
Total recorded investment in loans	189,161	194,937
Residential mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,324	1,399
Residential mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	510	939
Residential mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	946	1,474
Residential mortgages | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Consumer Loans
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	274,828	274,895
Consumer Loans | Loans acquired with deteriorated credit quality
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans		0
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	14	24
Aging of the recorded investment in loans past due [Abstract]
Past Due	23	50
Loans Not Past Due	1,370	1,466
Total recorded investment in loans	1,393	1,516
Consumer Loans | Credit cards | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	5	17
Consumer Loans | Credit cards | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	4	9
Consumer Loans | Credit cards | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	14	24
Consumer Loans | Credit cards | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,289	1,310
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,171	1,279
Loans Not Past Due	97,366	99,599
Total recorded investment in loans	98,537	100,878
Consumer Loans | Home equity lines and loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	244	265
Consumer Loans | Home equity lines and loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	111	31
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	816	983
Consumer Loans | Home equity lines and loans | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Consumer Loans | Indirect consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	616	935
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,969	2,887
Loans Not Past Due	155,557	150,645
Total recorded investment in loans	157,526	153,532
Consumer Loans | Indirect consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,424	1,822
Consumer Loans | Indirect consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	240	484
Consumer Loans | Indirect consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	305	581
Consumer Loans | Indirect consumer loans | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	31	14
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	103	78
Loans Not Past Due	17,269	18,891
Total recorded investment in loans	17,372	18,969
Consumer Loans | Direct consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	59	48
Consumer Loans | Direct consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	21	28
Consumer Loans | Direct consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	23	2
Consumer Loans | Direct consumer loans | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Commercial and industrial | Commercial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,075	5,250
Loans Past Due 90 Days or More and Still Accruing	0	5
Aging of the recorded investment in loans past due [Abstract]
Past Due	6,029	2,708
Loans Not Past Due	186,641	196,322
Total recorded investment in loans	192,670	199,030
Commercial and industrial | Commercial and agricultural | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	5,894	1,689
Commercial and industrial | Commercial and agricultural | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	121	999
Commercial and industrial | Commercial and agricultural | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	14	20
Commercial and industrial | Commercial and agricultural | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	0
Agricultural | Commercial and agricultural
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	0
Loans Not Past Due	288	546
Total recorded investment in loans	288	546
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
Agricultural | Commercial and agricultural | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	$ 0	$ 0

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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