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Loans and allowance for loan losses - Impaired Loans Recognized, Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment $ 8,220 $ 1,104
Impaired loan with no related allowance, average recorded investment 6,424 8,095
Total impaired loans, average recorded investment 14,644 9,199
Impaired loans with related allowance, interest income recognized (cash basis) 42 11
Impaired loan with no related allowance, interest income recognized (cash basis) 102 110
Total impaired loans, interest income recognized (cash basis) 144 121
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 1,902 53
Impaired loan with no related allowance, average recorded investment 1,044 1,430
Impaired loans with related allowance, interest income recognized (cash basis) 38 1
Impaired loan with no related allowance, interest income recognized (cash basis) 14 16
Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 0 0
Impaired loan with no related allowance, average recorded investment 1,221 1,287
Impaired loans with related allowance, interest income recognized (cash basis) 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 48 30
Residential real estate: | 1-to-4 family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 275 193
Impaired loan with no related allowance, average recorded investment 656 1,185
Impaired loans with related allowance, interest income recognized (cash basis) 2 2
Impaired loan with no related allowance, interest income recognized (cash basis) 8 13
Residential real estate: | Residential line of credit    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 0 0
Impaired loan with no related allowance, average recorded investment 425 0
Impaired loans with related allowance, interest income recognized (cash basis) 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 2 0
Residential real estate: | Multi-family mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 0 0
Impaired loan with no related allowance, average recorded investment 0 971
Impaired loans with related allowance, interest income recognized (cash basis) 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 0 12
Commercial real estate: | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 375 715
Impaired loan with no related allowance, average recorded investment 1,957 1,621
Impaired loans with related allowance, interest income recognized (cash basis) 2 6
Impaired loan with no related allowance, interest income recognized (cash basis) 28 32
Commercial real estate: | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 5,668 143
Impaired loan with no related allowance, average recorded investment 1,049 1,574
Impaired loans with related allowance, interest income recognized (cash basis) 0 2
Impaired loan with no related allowance, interest income recognized (cash basis) 0 7
Consumer and other    
Financing Receivable, Impaired [Line Items]    
Impaired loans with related allowance, average recorded investment 0 0
Impaired loan with no related allowance, average recorded investment 72 27
Impaired loans with related allowance, interest income recognized (cash basis) 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) $ 2 $ 0