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Loans (Details 1) - National Bancshares Corporation - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Total outstanding balance $ 1,178 $ 950
Carrying amount, net of allowance 917 690
Commercial real estate, Non-owner occupied | Commercial real estate    
Financing Receivable Impaired [Line Items]    
Loans acquired with deteriorated credit quality 574 225
Commercial, Commercial and industrial | Commercial    
Financing Receivable Impaired [Line Items]    
Loans acquired with deteriorated credit quality $ 604 $ 725