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Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
The accrued postretirement benefit liability due to termination of plan $ 0 $ 70,000  
Defined Benefit Postretirement Health Coverage      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan (70,000) (184,000) $ (12,000)
National Bancshares Corporation      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan 91,000 130,000 0
Liability under the Plan $ 1,000,000 1,000,000  
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 the participants' voluntary contributions of gross wages 6.00%    
(Benefit) expense under the plan $ 556,000 506,000 431,000
Profit Sharing Plan      
Defined Benefit Plan Disclosure [Line Items]      
(Benefit) expense under the plan $ 103,000 $ 103,000 $ 82,000
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 $ 8,000 $ 9,000 $ 10,000
Liability under the Plan 133,000 141,000  
Deferred compensation plan asset recorded 566,000 345,000 67,000
Deferred compensation plan liability recorded 566,000 345,000 $ 67,000
ESOP | Tri-State 1st Banc Incorporation      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to the plan $ 0 $ 0  
Shares held in trust 0 39,690