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Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment $ 10,718 $ 7,009
Impaired loans with related allowance, unpaid principal 10,851 7,204
Impaired loans with related allowance, related allowance 735 268
Impaired loan with no related allowance, recorded investment 7,549 6,707
Impaired loan with no related allowance, unpaid principal 10,326 8,577
Total impaired loans, recorded investment 18,267 13,716
Total impaired loans, unpaid principal 21,177 15,781
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 3,081 618
Impaired loans with related allowance, unpaid principal 3,081 732
Impaired loans with related allowance, related allowance 13 3
Impaired loan with no related allowance, recorded investment 753 1,229
Impaired loan with no related allowance, unpaid principal 898 1,281
Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loan with no related allowance, recorded investment 2,061 1,221
Impaired loan with no related allowance, unpaid principal 2,484 1,262
Residential real estate: | 1-to-4 family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 264 145
Impaired loans with related allowance, unpaid principal 324 145
Impaired loans with related allowance, related allowance 11 7
Impaired loan with no related allowance, recorded investment 1,082 842
Impaired loan with no related allowance, unpaid principal 1,400 1,151
Residential real estate: | Residential line of credit    
Financing Receivable, Impaired [Line Items]    
Impaired loan with no related allowance, recorded investment 245 245
Impaired loan with no related allowance, unpaid principal 262 249
Commercial real estate: | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 182 560
Impaired loans with related allowance, unpaid principal 220 641
Impaired loans with related allowance, related allowance 52 53
Impaired loan with no related allowance, recorded investment 2,294 2,048
Impaired loan with no related allowance, unpaid principal 3,437 2,780
Commercial real estate: | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 6,796 5,686
Impaired loans with related allowance, unpaid principal 6,831 5,686
Impaired loans with related allowance, related allowance 405 205
Impaired loan with no related allowance, recorded investment 1,050 1,049
Impaired loan with no related allowance, unpaid principal 1,781 1,781
Consumer and other    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 395  
Impaired loans with related allowance, unpaid principal 395  
Impaired loans with related allowance, related allowance 254  
Impaired loan with no related allowance, recorded investment 64 73
Impaired loan with no related allowance, unpaid principal $ 64 $ 73