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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 15,208	$ 12,043
Loans Past Due 90 Days or More and Still Accruing	36	13
Aging of the recorded investment in loans past due [Abstract]
Past Due	14,571	17,873
Loans Not Past Due	1,240,219	1,184,191
Total recorded investment in loans	1,255,796	1,203,482
30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,802	4,969
60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,988	6,383
90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	6,781	6,521
Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,006	1,418
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	1,006	1,418
Commercial and agricultural:
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	189,939	177,027
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	0
Commercial Mortgages
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	606,242	570,156
Commercial Mortgages | Loans acquired with deteriorated credit quality
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	1,006	1,323
Commercial Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,307	19
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,288	1,177
Loans Not Past Due	56,406	45,333
Total recorded investment in loans	57,694	46,510
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	1,177
Commercial Mortgages | Construction | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,288	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	8,752	5,454
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	6,248	7,524
Loans Not Past Due	541,294	514,799
Total recorded investment in loans	548,548	523,646
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	493	652
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,208	4,460
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,547	2,412
Commercial Mortgages | Commercial mortgages | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,006	1,323
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	1,006	1,323
Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,278	4,201
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	3,624	4,919
Loans Not Past Due	197,493	193,951
Total recorded investment in loans	201,117	198,965
Residential mortgages | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,373	2,100
Residential mortgages | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	485	436
Residential mortgages | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,766	2,383
Residential mortgages | Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	95
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	95
Consumer loans:
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	258,498	257,334
Consumer loans: | Loans acquired with deteriorated credit quality
Aging of the recorded investment in loans past due [Abstract]
Total recorded investment in loans	0	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	27	11
Aging of the recorded investment in loans past due [Abstract]
Past Due	46	23
Loans Not Past Due	1,357	1,453
Total recorded investment in loans	1,403	1,476
Consumer loans: | Credit cards | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	6	3
Consumer loans: | Credit cards | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	13	9
Consumer loans: | Credit cards | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	27	11
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	1,181	1,670
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,115	1,376
Loans Not Past Due	96,409	97,477
Total recorded investment in loans	97,524	98,853
Consumer loans: | Home equity lines and loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	257	227
Consumer loans: | Home equity lines and loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	98	0
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	760	1,149
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	673	654
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	2,165	2,602
Loans Not Past Due	140,967	137,391
Total recorded investment in loans	143,132	139,993
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	1,616	1,773
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	165	287
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	384	542
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	17	45
Loans Past Due 90 Days or More and Still Accruing	0	0
Aging of the recorded investment in loans past due [Abstract]
Past Due	54	83
Loans Not Past Due	16,385	16,929
Total recorded investment in loans	16,439	17,012
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	51	54
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	3	7
Consumer loans: | Direct consumer loans | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	0	22
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	0	0
Loans Past Due 90 Days or More and Still Accruing	9	2
Aging of the recorded investment in loans past due [Abstract]
Past Due	31	169
Loans Not Past Due	189,376	176,497
Total recorded investment in loans	189,407	176,666
Commercial and industrial | Commercial and agricultural: | 30 - 59 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	6	160
Commercial and industrial | Commercial and agricultural: | 60 - 89 Days Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	16	7
Commercial and industrial | Commercial and agricultural: | 90 Days or More Past Due
Aging of the recorded investment in loans past due [Abstract]
Past Due	9	2
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	532	361
Total recorded investment in loans	532	361
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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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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