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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Trouble Debt Restructuring (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract | Dec. 31, 2015 USD ($) Contract
LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |
Reserves of allowance for loan losses | $ 41 | $ 29 | $ 37
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 2 | 0 | 0
Total recidivism, Recorded investment | $ 632 | $ 0 | $ 0
Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 1
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 71
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 71
Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 12 | 19 | 1
Pre-modification outstanding recorded investment | $ 8,691 | $ 7,778 | $ 19
Post-modification outstanding recorded investment | $ 8,691 | $ 7,778 | $ 19
Real Estate Loans [Member] | Home Equity [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 |  |
Pre-modification outstanding recorded investment | $ 0 |  |
Post-modification outstanding recorded investment | $ 0 |  |
Real Estate Loans [Member] | Home Equity [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 |  |
Pre-modification outstanding recorded investment | $ 25 |  |
Post-modification outstanding recorded investment | $ 25 |  |
Real Estate Loans [Member] | Mortgages [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract |  |  | 1
Pre-modification outstanding recorded investment |  |  | $ 71
Post-modification outstanding recorded investment |  |  | $ 71
Real Estate Loans [Member] | Mortgages [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract |  |  | 1
Pre-modification outstanding recorded investment |  |  | $ 19
Post-modification outstanding recorded investment |  |  | $ 19
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | $ 0 | $ 0 |
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 5 | 4 |
Pre-modification outstanding recorded investment | $ 7,021 | $ 1,188 |
Post-modification outstanding recorded investment | $ 7,021 | $ 1,188 |
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | $ 0 | $ 0 |
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 4 | 5 |
Pre-modification outstanding recorded investment | $ 1,475 | $ 1,956 |
Post-modification outstanding recorded investment | $ 1,475 | $ 1,956 |
Other Commercial Loans [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | $ 0 | $ 0 |
Other Commercial Loans [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 | 3 |
Pre-modification outstanding recorded investment | $ 9 | $ 3,076 |
Post-modification outstanding recorded investment | $ 9 | $ 3,076 |
Other Agricultural Loans [Member] |  |  |
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 2 | 0 | 0
Total recidivism, Recorded investment | $ 632 | $ 0 | $ 0
Other Agricultural Loans [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | $ 0 | $ 0 |
Other Agricultural Loans [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 | 7 |
Pre-modification outstanding recorded investment | $ 161 | $ 1,558 |
Post-modification outstanding recorded investment | $ 161 | $ 1,558 |

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