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Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment $ 7,009 $ 1,235  
Impaired loans with related allowance, unpaid principal 7,204 1,821  
Impaired loans with related allowance, related allowance 268 191  
Impaired loan with no related allowance, recorded investment 6,707 8,138  
Impaired loan with no related allowance, unpaid principal 8,577 9,451  
Total impaired loans, recorded investment 13,716 9,373  
Total impaired loans, unpaid principal 15,781 11,272  
Impaired loans with related allowance, average recorded investment 4,122 1,992 $ 6,432
Impaired loans with related allowance, interest income recognized (cash basis) 175 64 43
Impaired loan with no related allowance, average recorded investment 7,423 9,175 7,835
Impaired loan with no related allowance, interest income recognized (cash basis) 418 335 455
Total impaired loans, average recorded investment 11,545 11,167 14,267
Total impaired loans, interest income recognized (cash basis) 593 399 498
Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 618 53  
Impaired loans with related allowance, unpaid principal 732 53  
Impaired loans with related allowance, related allowance 3 20  
Impaired loan with no related allowance, recorded investment 1,229 1,526  
Impaired loan with no related allowance, unpaid principal 1,281 1,570  
Impaired loans with related allowance, average recorded investment 335 454 994
Impaired loans with related allowance, interest income recognized (cash basis) 121 2 17
Impaired loan with no related allowance, average recorded investment 1,377 1,074 494
Impaired loan with no related allowance, interest income recognized (cash basis) 70 38 20
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 1,221 1,289  
Impaired loan with no related allowance, unpaid principal 1,262 1,313  
Impaired loans with related allowance, average recorded investment 0 0 154
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, average recorded investment 1,255 1,988 2,622
Impaired loan with no related allowance, interest income recognized (cash basis) 74 46 132
Residential real estate: | 1-to-4 family mortgage      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 145 194  
Impaired loans with related allowance, unpaid principal 145 495  
Impaired loans with related allowance, related allowance 7 18  
Impaired loan with no related allowance, recorded investment 842 1,068  
Impaired loan with no related allowance, unpaid principal 1,151 1,072  
Impaired loans with related allowance, average recorded investment 170 149 1,750
Impaired loans with related allowance, interest income recognized (cash basis) 9 9 1
Impaired loan with no related allowance, average recorded investment 955 1,718 1,329
Impaired loan with no related allowance, interest income recognized (cash basis) 74 63 137
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 245 0  
Impaired loan with no related allowance, unpaid principal 249 0  
Impaired loans with related allowance, average recorded investment 0 0 0
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, average recorded investment 123 156 156
Impaired loan with no related allowance, interest income recognized (cash basis) 15 0 10
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 0 978  
Impaired loan with no related allowance, unpaid principal 0 978  
Impaired loans with related allowance, average recorded investment 0 0 0
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, average recorded investment 489 1,003 1,051
Impaired loan with no related allowance, interest income recognized (cash basis) 26 46 37
Commercial real estate: | Owner occupied      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 560 844  
Impaired loans with related allowance, unpaid principal 641 1,123  
Impaired loans with related allowance, related allowance 53 120  
Impaired loan with no related allowance, recorded investment 2,048 1,676  
Impaired loan with no related allowance, unpaid principal 2,780 2,168  
Impaired loans with related allowance, average recorded investment 702 740 1,756
Impaired loans with related allowance, interest income recognized (cash basis) 43 48 25
Impaired loan with no related allowance, average recorded investment 1,862 1,897 1,120
Impaired loan with no related allowance, interest income recognized (cash basis) 148 122 119
Commercial real estate: | Non-owner occupied      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 5,686 144  
Impaired loans with related allowance, unpaid principal 5,686 150  
Impaired loans with related allowance, related allowance 205 33  
Impaired loan with no related allowance, recorded investment 1,049 1,576  
Impaired loan with no related allowance, unpaid principal 1,781 2,325  
Impaired loans with related allowance, average recorded investment 2,915 648 1,777
Impaired loans with related allowance, interest income recognized (cash basis) 2 5 0
Impaired loan with no related allowance, average recorded investment 1,313 1,313 1,050
Impaired loan with no related allowance, interest income recognized (cash basis) 7 19 0
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 73 25  
Impaired loan with no related allowance, unpaid principal 73 25  
Impaired loans with related allowance, average recorded investment 0 1 1
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, average recorded investment 49 26 13
Impaired loan with no related allowance, interest income recognized (cash basis) $ 4 $ 1 $ 0