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Loans (Details 5) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded $ 4,085 $ 4,282
Unpaid Principal Balance, With an allowance recorded 1,710 1,636
Unpaid Principal Balance 5,795 5,918
Recorded Investment, With no related allowance recorded 3,738 3,925
Recorded Investment, With an allowance recorded 1,672 1,611
Recorded Investment 5,410 5,536
Allowance for Loan Losses Allocated 210 162
Consumer    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded 159 145
Unpaid Principal Balance, With an allowance recorded 2  
Recorded Investment, With no related allowance recorded 63 59
Recorded Investment, With an allowance recorded 2  
Allowance for Loan Losses Allocated 1  
Commercial real estate, Owner occupied | Commercial real estate    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded 536 659
Recorded Investment, With no related allowance recorded 537 658
Commercial, Commercial and industrial | Commercial    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded 210 214
Unpaid Principal Balance, With an allowance recorded 66 68
Recorded Investment, With no related allowance recorded 189 192
Recorded Investment, With an allowance recorded 66 68
Allowance for Loan Losses Allocated 3 4
Residential real estate, 1-4 family residential | Residential real estate    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded 2,849 2,923
Unpaid Principal Balance, With an allowance recorded 1,473 1,409
Recorded Investment, With no related allowance recorded 2,630 2,697
Recorded Investment, With an allowance recorded 1,447 1,387
Allowance for Loan Losses Allocated 131 84
Residential real estate, Home equity lines of credit | Residential real estate    
Financing Receivable Impaired [Line Items]    
Unpaid Principal Balance, With no related allowance recorded 331 341
Unpaid Principal Balance, With an allowance recorded 169 159
Recorded Investment, With no related allowance recorded 319 319
Recorded Investment, With an allowance recorded 157 156
Allowance for Loan Losses Allocated $ 75 $ 74