RETIREMENT PLANS, NARRATIVE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 01, 2017	Jul. 01, 2015	Feb. 01, 2009 age_and_service
Defined Contribution Plan [Abstract]
Age plus vesting service (less than, in years) | age_and_service						65
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009	50.00%
Maximum annual contribution per employee, percent	3.00%
Minimum annual contribution for employees who received a benefit reduction under plan amendments	5.00%
Maximum annual contribution for employees who received a benefit reduction under plan amendments	7.00%
Defined benefit plan, minimum funded percentage				80.00%	80.00%
Employer expected contribution to 401 (k) plan in next fiscal year	$ 426
Deferred Compensation Arrangements
Deferred Compensation Arrangements [Abstract]
Accrued interest on deferred compensation	8.00%
Deferred compensation liability	$ 3,406	$ 3,407
Qualified noncontributory defined benefit retirement plan
Defined Contribution Plan [Abstract]
Expected contribution by employer to noncontributory defined benefit plan	224
Supplemental Employee Retirement Plan
Supplemental income plan [Abstract]
Projected benefit obligation	$ 1,249	$ 1,284
Discount rate	5.20%	5.20%
Service cost	$ 0	$ 0	$ 183
Interest cost	$ 62	$ 63	$ 56
Qualified noncontributory defined benefit retirement plan
Supplemental income plan [Abstract]
Discount rate	3.60%	4.14%	4.34%
Service cost	$ 0	$ 41	$ 38
Interest cost	69	78	$ 68
Recognized in other liabilities nonqualified defined benefit retirement plan	1,971	1,727
Accumulated benefit obligation under nonqualified defined benefit retirement plan	1,971	$ 1,727
Future amortization of prior service cost	16
Citizens National Bank
Defined Contribution Plan [Abstract]
Qualified noncontributory defined benefit pension plan liability	$ 128