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Loans (Details 6) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded $ 4,317 $ 4,168
Average Recorded Investment, With an allowance recorded 1,652 2,658
Average Recorded Investment 5,969 6,826
Interest Income Recognized, With no related allowance recorded 64 47
Interest Income Recognized, With related allowance recorded 13 26
Interest Income Recognized 77 73
Consumer    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 63 74
Average Recorded Investment, With an allowance recorded 1 1
Interest Income Recognized, With no related allowance recorded 3 3
Interest Income Recognized, With related allowance recorded 0 0
Commercial real estate, Owner occupied | Commercial real estate    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 420 1,051
Average Recorded Investment, With an allowance recorded 0 422
Interest Income Recognized, With no related allowance recorded 7 2
Interest Income Recognized, With related allowance recorded 0 2
Commercial real estate, Non-owner occupied | Commercial real estate    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 0 226
Average Recorded Investment, With an allowance recorded 0 1,107
Interest Income Recognized, With no related allowance recorded 0 0
Interest Income Recognized, With related allowance recorded 0 14
Commercial, Commercial and industrial | Commercial    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 873 210
Average Recorded Investment, With an allowance recorded 67 273
Interest Income Recognized, With no related allowance recorded 1 1
Interest Income Recognized, With related allowance recorded 1 1
Residential real estate, 1-4 family residential | Residential real estate    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 2,636 2,380
Average Recorded Investment, With an allowance recorded 1,429 773
Interest Income Recognized, With no related allowance recorded 49 37
Interest Income Recognized, With related allowance recorded 10 8
Residential real estate, Home equity lines of credit | Residential real estate    
Financing Receivable Impaired [Line Items]    
Average Recorded Investment, With no related allowance recorded 325 227
Average Recorded Investment, With an allowance recorded 155 82
Interest Income Recognized, With no related allowance recorded 4 4
Interest Income Recognized, With related allowance recorded $ 2 $ 1