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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Past Due (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recorded investment of past due [Abstract] |  |  |
Total past due | $ 12,204 | $ 14,133 |
Current | 985,683 | 782,111 |
PCI | 2,638 | 3,367 |
Total financing receivables | 1,000,525 | 799,611 |
90 Days or greater and accruing | 555 | 405 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Total past due and non-accrual | 8,160 | 10,729 |
Current and non-accrual | 2,011 | 725 |
PCI Loans considered non accrual | 0 | 0 |
Financing receivable nonaccrual status | 10,171 | 11,454 |
Foregone interest income | 709 | 603 | $ 463
Financing receivables on accrual status [Abstract] |  |  |
Total past due and still accruing | 4,044 | 3,404 |
Current and still accruing | 983,672 | 781,386 |
PCI Loans still accruing | 2,638 | 3,367 |
Total financing receivables and still accruing | $ 990,354 | 788,157 |
Minimum [Member] |  |  |
Financing receivables on nonaccrual status [Abstract] |  |  |
Period of past due after which loans considered as non accrual | 90 days |  |
30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | $ 3,053 | 3,024 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Total past due and non-accrual | 816 | 172 |
Financing receivables on accrual status [Abstract] |  |  |
Total past due and still accruing | 2,237 | 2,852 |
60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 1,533 | 252 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Total past due and non-accrual | 281 | 105 |
Financing receivables on accrual status [Abstract] |  |  |
Total past due and still accruing | 1,252 | 147 |
90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 7,618 | 10,857 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Total past due and non-accrual | 7,063 | 10,452 |
Financing receivables on accrual status [Abstract] |  |  |
Total past due and still accruing | 555 | 405 |
Real Estate Loans [Member] | Mortgages [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 2,168 | 1,775 |
Current | 152,144 | 146,920 |
PCI | 33 | 35 |
Total financing receivables | 154,345 | 148,730 |
90 Days or greater and accruing | 218 | 173 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 1,274 | 1,475 |
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 996 | 630 |
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 362 | 36 |
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 810 | 1,109 |
Real Estate Loans [Member] | Home Equity [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 441 | 642 |
Current | 59,693 | 58,051 |
PCI | 0 | 0 |
Total financing receivables | 60,134 | 58,693 |
90 Days or greater and accruing | 0 | 160 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 112 | 95 |
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 277 | 384 |
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 86 | 49 |
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 78 | 209 |
Real Estate Loans [Member] | Commercial [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 6,228 | 6,117 |
Current | 300,396 | 244,491 |
PCI | 1,460 | 1,969 |
Total financing receivables | 308,084 | 252,577 |
90 Days or greater and accruing | 162 | 0 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 5,192 | 4,445 |
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 1,353 | 1,757 |
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 1,010 | 58 |
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 3,865 | 4,302 |
Real Estate Loans [Member] | Agricultural [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 447 | 1,145 |
Current | 238,808 | 121,741 |
PCI | 702 | 738 |
Total financing receivables | 239,957 | 123,624 |
90 Days or greater and accruing | 30 | 0 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 175 | 1,340 |
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 242 | 0 |
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 205 | 1,145 |
Real Estate Loans [Member] | Construction [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 133 | 0 |
Current | 13,369 | 25,441 |
PCI | 0 | 0 |
Total financing receivables | 13,502 | 25,441 |
90 Days or greater and accruing | 0 | 0 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 133 | 0 |
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 133 | 0 |
Consumer [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 135 | 238 |
Current | 9,809 | 10,763 |
PCI | 0 | 4 |
Total financing receivables | 9,944 | 11,005 |
90 Days or greater and accruing | 7 | 67 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 42 | 42 |
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 53 | 115 |
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 33 | 40 |
Consumer [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 49 | 83 |
Other Commercial Loans [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 2,504 | 4,134 |
Current | 69,066 | 53,884 |
PCI | 443 | 621 |
Total financing receivables | 72,013 | 58,639 |
90 Days or greater and accruing | 32 | 0 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 2,637 | 4,057 |
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 132 | 95 |
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 35 |
Other Commercial Loans [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 2,372 | 4,004 |
Other Agricultural Loans [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 148 | 82 |
Current | 37,661 | 23,306 |
PCI | 0 | 0 |
Total financing receivables | 37,809 | 23,388 |
90 Days or greater and accruing | 106 | 5 |
Financing receivables on nonaccrual status [Abstract] |  |  |
Financing receivable nonaccrual status | 606 | 0 |
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 43 |
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 42 | 34 |
Other Agricultural Loans [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 106 | 5 |
State and Political Subdivision Loans [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
Current | 104,737 | 97,514 |
PCI | 0 | 0 |
Total financing receivables | 104,737 | 97,514 |
90 Days or greater and accruing | 0 | 0 |
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | 0 | 0 |
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member] |  |  |
Recorded investment of past due [Abstract] |  |  |
Total past due | $ 0 | $ 0 |

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