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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 12,790 | $ 17,324
Loans Past Due 90 Days or More and Still Accruing | 17 | 29
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 10,611 | 14,076
Loans Not Past Due | 1,327,499 | 1,300,714
Total recorded investment in loans | 1,338,110 | 1,315,582
30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 3,906 | 7,639
60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,034 | 2,605
90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 5,671 | 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 | 194,057 | 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 | 668,558 | 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 | 123 | 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 | 45,671 | 45,688
Total recorded investment in loans | 45,671 | 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 | 6,101 | 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 | 4,424 | 3,262
Loans Not Past Due | 618,463 | 596,432
Total recorded investment in loans | 622,887 | 600,486
Commercial Mortgages | Commercial mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 992 | 2,399
Commercial Mortgages | Commercial mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 93 | 115
Commercial Mortgages | Commercial mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 3,339 | 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 | 2,981 | 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 | 2,870 | 3,812
Loans Not Past Due | 191,061 | 191,125
Total recorded investment in loans | 193,931 | 194,937
Residential mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,117 | 1,399
Residential mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 492 | 939
Residential mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,261 | 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 | 281,564 | 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 | 36 | 50
Loans Not Past Due | 1,332 | 1,466
Total recorded investment in loans | 1,368 | 1,516
Consumer loans: | Credit cards | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 11 | 17
Consumer loans: | Credit cards | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 11 | 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 | 1,359 | 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 | 1,342 | 1,279
Loans Not Past Due | 97,995 | 99,599
Total recorded investment in loans | 99,337 | 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 | 359 | 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 | 196 | 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 | 787 | 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 | 673 | 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 | 1,428 | 2,887
Loans Not Past Due | 161,778 | 150,645
Total recorded investment in loans | 163,206 | 153,532
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 979 | 1,822
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 218 | 484
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 231 | 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 | 40 | 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 | 102 | 78
Loans Not Past Due | 17,551 | 18,891
Total recorded investment in loans | 17,653 | 18,969
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 56 | 48
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 24 | 28
Consumer loans: | Direct consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 22 | 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 | 1,513 | 5,250
Loans Past Due 90 Days or More and Still Accruing | 3 | 5
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 409 | 2,708
Loans Not Past Due | 193,223 | 196,322
Total recorded investment in loans | 193,632 | 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 | 392 | 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 | 17 | 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 | 425 | 546
Total recorded investment in loans | 425 | 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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