RETIREMENT PLANS, NARRATIVE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 01, 2019	Jul. 01, 2018	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%
Deferred Compensation Arrangements
Deferred Compensation Arrangements [Abstract]
Accrued interest on deferred compensation	8.00%
Deferred compensation liability	$ 3,362	$ 3,364
Qualified noncontributory defined benefit retirement plan
Defined Contribution Plan [Abstract]
Expected contribution by employer to noncontributory defined benefit plan	205
Supplemental Employee Retirement Plan
Supplemental income plan [Abstract]
Projected benefit obligation	$ 998	$ 1,092
Discount rate	5.20%	5.20%
Service cost	$ 0	$ 0	$ 0
Interest cost	$ 52	$ 59	$ 62
Qualified noncontributory defined benefit retirement plan
Supplemental income plan [Abstract]
Discount rate	3.22%	4.22%	3.60%
Service cost	$ 0	$ 0	$ 0
Interest cost	77	69	$ 69
Recognized in other liabilities nonqualified defined benefit retirement plan	2,045	1,900
Accumulated benefit obligation under nonqualified defined benefit retirement plan	2,045	$ 1,900
Future amortization of prior service cost	1
Citizens National Bank
Defined Contribution Plan [Abstract]
Qualified noncontributory defined benefit pension plan liability	$ 69