Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
National Bancshares Corporation
Defined Benefit Plan Disclosure [Line Items]
(Benefit) expense under the plan	$ 180	$ 136	$ (19)
Liability under the Plan	$ 1,100	1,000
Director age for eligibility for annual retirement benefit plan	70 years
Maximum years for benefit payment under the plan	15 years
Retirement Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Employees who have completed no days of service	90 days
Percentage of matching contribution by company	50.00%
(Benefit) expense under the plan	$ 665	708	573
Retirement Savings Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percentage of the participants' voluntary contributions of gross wages	6.00%
Profit Sharing Plan
Defined Benefit Plan Disclosure [Line Items]
(Benefit) expense under the plan	$ 195	$ 95	$ 78
Annual compensation for associates, Percent	2.00%	1.00%	1.00%
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
(Benefit) expense under the plan	$ 7	$ 7	$ 8
Liability under the Plan	105	115
Deferred compensation plan asset recorded	1,900	1,300
Deferred compensation plan liability recorded	$ 1,900	$ 1,300