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Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment $ 9,430 $ 7,009
Impaired loans with related allowance, unpaid principal 9,459 7,204
Impaired loans with related allowance, related allowance 1,186 268
Impaired loan with no related allowance, recorded investment 6,138 6,707
Impaired loan with no related allowance, unpaid principal 8,149 8,577
Total impaired loans, recorded investment 15,568 13,716
Total impaired loans, unpaid principal 17,608 15,781
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 3,186 618
Impaired loans with related allowance, unpaid principal 3,186 732
Impaired loans with related allowance, related allowance 709 3
Impaired loan with no related allowance, recorded investment 859 1,229
Impaired loan with no related allowance, unpaid principal 1,022 1,281
Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 0 0
Impaired loans with related allowance, unpaid principal 0 0
Impaired loans with related allowance, related allowance 0 0
Impaired loan with no related allowance, recorded investment 1,220 1,221
Impaired loan with no related allowance, unpaid principal 1,264 1,262
Residential real estate: | 1-to-4 family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 405 145
Impaired loans with related allowance, unpaid principal 405 145
Impaired loans with related allowance, related allowance 136 7
Impaired loan with no related allowance, recorded investment 469 842
Impaired loan with no related allowance, unpaid principal 779 1,151
Residential real estate: | Residential line of credit    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 0 0
Impaired loans with related allowance, unpaid principal 0 0
Impaired loans with related allowance, related allowance 0 0
Impaired loan with no related allowance, recorded investment 605 245
Impaired loan with no related allowance, unpaid principal 613 249
Residential real estate: | Multi-family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 0 0
Impaired loans with related allowance, unpaid principal 0 0
Impaired loans with related allowance, related allowance 0 0
Impaired loan with no related allowance, recorded investment 0 0
Impaired loan with no related allowance, unpaid principal 0 0
Commercial real estate: | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 189 560
Impaired loans with related allowance, unpaid principal 218 641
Impaired loans with related allowance, related allowance 42 53
Impaired loan with no related allowance, recorded investment 1,865 2,048
Impaired loan with no related allowance, unpaid principal 2,619 2,780
Commercial real estate: | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 5,650 5,686
Impaired loans with related allowance, unpaid principal 5,650 5,686
Impaired loans with related allowance, related allowance 299 205
Impaired loan with no related allowance, recorded investment 1,049 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 0 0
Impaired loans with related allowance, unpaid principal 0 0
Impaired loans with related allowance, related allowance 0 0
Impaired loan with no related allowance, recorded investment 71 73
Impaired loan with no related allowance, unpaid principal $ 71 $ 73