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Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment $ 9,576 $ 7,009
Impaired loans with related allowance, unpaid principal 9,701 7,204
Impaired loans with related allowance, related allowance 701 268
Impaired loan with no related allowance, recorded investment 6,102 6,707
Impaired loan with no related allowance, unpaid principal 8,141 8,577
Total impaired loans, recorded investment 15,678 13,716
Total impaired loans, unpaid principal 17,842 15,781
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 3,136 618
Impaired loans with related allowance, unpaid principal 3,136 732
Impaired loans with related allowance, related allowance 11 3
Impaired loan with no related allowance, recorded investment 778 1,229
Impaired loan with no related allowance, unpaid principal 935 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 1,216 1,221
Impaired loan with no related allowance, unpaid principal 1,263 1,262
Residential real estate: | 1-to-4 family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 266 145
Impaired loans with related allowance, unpaid principal 324 145
Impaired loans with related allowance, related allowance 15 7
Impaired loan with no related allowance, recorded investment 587 842
Impaired loan with no related allowance, unpaid principal 899 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 609 245
Impaired loan with no related allowance, unpaid principal 628 249
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 185 560
Impaired loans with related allowance, unpaid principal 218 641
Impaired loans with related allowance, related allowance 38 53
Impaired loan with no related allowance, recorded investment 1,795 2,048
Impaired loan with no related allowance, unpaid principal 2,567 2,780
Commercial real estate: | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, recorded investment 5,490 5,686
Impaired loans with related allowance, unpaid principal 5,524 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 499 0
Impaired loans with related allowance, unpaid principal 499 0
Impaired loans with related allowance, related allowance 338 0
Impaired loan with no related allowance, recorded investment 68 73
Impaired loan with no related allowance, unpaid principal $ 68 $ 73