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Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
The accrued postretirement benefit liability due to termination of plan $ 0 $ 0  
National Bancshares Corporation      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan 136,000 (19,000) $ (91,000)
Liability under the Plan $ 1,000,000 941,000  
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 $ 708,000 573,000 556,000
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 $ 95,000 $ 78,000 $ 105,000
Annual compensation for associates, Percent 1.00% 1.00% 1.00%
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan $ 7,000 $ 8,000 $ 8,000
Liability under the Plan 115,000 124,000  
Deferred compensation plan asset recorded 1,300,000 753,000 566,000
Deferred compensation plan liability recorded $ 1,300,000 $ 753,000 566,000
Defined Benefit Postretirement Health Coverage      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan     $ (70,000)