Loans (Details 1)
$ in Thousands
Dec. 31, 2015
USD ($)
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality $ 3,125
Commercial  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality 1,476
National Bancshares Corporation  
Financing Receivable Impaired [Line Items]  
Total outstanding balance 3,063
Carrying amount, net of allowance 2,215
National Bancshares Corporation | Commercial  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality 1,576
Commercial real estate, Owner occupied | Commercial real estate  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality 1,063
Commercial real estate, Owner occupied | National Bancshares Corporation | Commercial real estate  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality 986
Commercial real estate, Non-owner occupied | Commercial real estate  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality 586
Commercial real estate, Non-owner occupied | National Bancshares Corporation | Commercial real estate  
Financing Receivable Impaired [Line Items]  
Loans acquired with deteriorated credit quality $ 501