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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 17,280 | $ 17,324
Loans Past Due 90 Days or More and Still Accruing | 28 | 29
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 13,221 | 14,076
Loans Not Past Due | 1,310,308 | 1,300,714
Total recorded investment in loans | 1,323,529 | 1,315,582
30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 5,214 | 7,639
60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 768 | 2,605
90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 7,239 | 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 | 201,037 | 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 | 649,413 | 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 | 130 | 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 | 55,560 | 45,688
Total recorded investment in loans | 55,560 | 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 | 6,597 | 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 | 1,370 | 3,262
Loans Not Past Due | 592,483 | 596,432
Total recorded investment in loans | 593,853 | 600,486
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 442 | 2,399
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 115
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 928 | 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 | 3,155 | 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 | 3,290 | 3,812
Loans Not Past Due | 191,806 | 191,125
Total recorded investment in loans | 195,096 | 194,937
Residential mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,719 | 1,399
Residential mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 308 | 939
Residential mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,263 | 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 | 277,983 | 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 | 26 | 24
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 38 | 50
Loans Not Past Due | 1,380 | 1,466
Total recorded investment in loans | 1,418 | 1,516
Consumer loans: | Credit cards | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 3 | 17
Consumer loans: | Credit cards | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 9 | 9
Consumer loans: | Credit cards | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 26 | 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 | 1,302 | 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 | 1,370 | 1,279
Loans Not Past Due | 99,532 | 99,599
Total recorded investment in loans | 100,902 | 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 | 283 | 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 | 231 | 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 | 856 | 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 | 886 | 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 | 2,037 | 2,887
Loans Not Past Due | 155,303 | 150,645
Total recorded investment in loans | 157,340 | 153,532
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,332 | 1,822
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 216 | 484
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 489 | 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 | 46 | 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 | 77 | 78
Loans Not Past Due | 18,246 | 18,891
Total recorded investment in loans | 18,323 | 18,969
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 38 | 48
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 4 | 28
Consumer loans: | Direct consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 35 | 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 | 5,164 | 5,250
Loans Past Due 90 Days or More and Still Accruing | 2 | 5
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 5,039 | 2,708
Loans Not Past Due | 195,468 | 196,322
Total recorded investment in loans | 200,507 | 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 | 1,397 | 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 | 0 | 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 | 3,642 | 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 | 530 | 546
Total recorded investment in loans | 530 | 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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