LOANS, PAST-DUE, AND ACCRUING RESTRUCTURED LOANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	$ 2,965	$ 5,725
Past-due 90 days or more and still accruing	0	23
Total non-accrual and past-due 90 days or more and still accruing	2,965	5,748
Accruing restructured loans	10,469	11,731
Total	$ 13,434	$ 17,479
Percentage of total non-accrual and past-due 90 days or more and still accruing to total loans	0.35%	0.70%
Percentage of total non-accrual, past-due 90 days or more and still accruing, and accruing restructured loans to total loans	1.58%	2.13%
Interest income	$ 202	$ 220
Commercial & industrial
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	0	0
Past-due 90 days or more and still accruing	0	0
Commercial, secured by real estate
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	2,183	4,312
Past-due 90 days or more and still accruing	0	0
Agricultural
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	178	334
Past-due 90 days or more and still accruing	0	0
Residential real estate
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	604	1,079
Past-due 90 days or more and still accruing	$ 0	$ 20