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Loans (Details 1) - National Bancshares Corporation - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Total outstanding balance $ 1,011 $ 1,191
Carrying amount, net of allowance 744 903
Commercial real estate, Non-owner occupied | Commercial real estate    
Financing Receivable Impaired [Line Items]    
Loans acquired with deteriorated credit quality 242 292
Commercial, Commercial and industrial | Commercial    
Financing Receivable Impaired [Line Items]    
Loans acquired with deteriorated credit quality $ 769 $ 899