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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 12,043	$ 12,232
Loans Past Due 90 Days or More and Still Accruing	13	18
Past Due	17,873	18,478
Loans Not Past Due	1,184,191	1,150,929
Loans	1,203,482	1,171,503
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,969	9,793
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,383	1,012
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,521	7,674
Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	177,027	193,700
Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	570,156	507,700
Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	4,201	3,610
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	4,919	5,410
Loans Not Past Due	193,951	190,555
Loans	198,965	196,236
Residential Mortgages | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,100	2,983
Residential Mortgages | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	436	725
Residential Mortgages | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,383	1,703
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	257,334	273,867
Construction | Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	19	63
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	1,177	0
Loans Not Past Due	45,333	41,231
Loans	46,510	41,231
Construction | Commercial mortgages: | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Construction | Commercial mortgages: | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,177	0
Construction | Commercial mortgages: | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial mortgages | Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	5,454	7,203
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	7,524	9,635
Loans Not Past Due	514,799	455,009
Loans	523,646	466,469
Commercial mortgages | Commercial mortgages: | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	652	4,197
Commercial mortgages | Commercial mortgages: | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,460	199
Commercial mortgages | Commercial mortgages: | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,412	5,239
Credit cards | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans Past Due 90 Days or More and Still Accruing	11	15
Past Due	23	50
Loans Not Past Due	1,453	1,433
Loans	1,476	1,482
Credit cards | Consumer Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3	30
Credit cards | Consumer Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9	4
Credit cards | Consumer Loans | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	15
Home equity lines and loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,670	757
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	1,376	549
Loans Not Past Due	97,477	101,428
Loans	98,853	101,977
Home equity lines and loans | Consumer Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	227	233
Home equity lines and loans | Consumer Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	77
Home equity lines and loans | Consumer Loans | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,149	239
Indirect Consumer Loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	654	542
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	2,602	2,194
Loans Not Past Due	137,391	149,531
Loans	139,993	151,726
Indirect Consumer Loans | Consumer Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,773	1,744
Indirect Consumer Loans | Consumer Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	287	4
Indirect Consumer Loans | Consumer Loans | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	542	447
Direct consumer loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	45	43
Loans Past Due 90 Days or More and Still Accruing	0	0
Past Due	83	227
Loans Not Past Due	16,929	18,455
Loans	17,012	18,682
Direct consumer loans | Consumer Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	54	208
Direct consumer loans | Consumer Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7	0
Direct consumer loans | Consumer Loans | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22	19
Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,418	2,095
Loans	1,418	2,095
Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,323	1,825
Loans acquired with deteriorated credit quality | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	95	270
Loans	95	270
Loans acquired with deteriorated credit quality | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Construction | Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Loans acquired with deteriorated credit quality | Commercial mortgages | Commercial mortgages:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,323	1,825
Loans	1,323	1,825
Loans acquired with deteriorated credit quality | Credit cards | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Loans acquired with deteriorated credit quality | Home equity lines and loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Loans acquired with deteriorated credit quality | Indirect Consumer Loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Loans acquired with deteriorated credit quality | Direct consumer loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Commercial and industrial | Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	13
Loans Past Due 90 Days or More and Still Accruing	2	3
Past Due	169	413
Loans Not Past Due	176,497	192,248
Loans	176,666	192,661
Commercial and industrial | Commercial, and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	160	398
Commercial and industrial | Commercial, and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7	3
Commercial and industrial | Commercial, and Agricultural | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2	12
Commercial and industrial | Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	0	0
Agricultural | Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loans Not Past Due	361	1,039
Loans	361	1,039
Agricultural | Commercial, and Agricultural | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Agricultural | Commercial, and Agricultural | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Agricultural | Commercial, and Agricultural | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Agricultural | Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Loans	$ 0	$ 0

X

- 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
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 7
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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