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Loans and allowance for credit losses - Impaired Loans Recognized, Recorded Investment and Interest Income (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment $ 8,220
Impaired loan with no related allowance, average recorded investment 6,424
Total impaired loans, average recorded investment 14,644
Impaired loans with related allowance, interest income recognized (cash basis) 42
Impaired loan with no related allowance, interest income recognized (cash basis) 102
Total impaired loans, interest income recognized (cash basis) 144
Commercial and industrial  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 1,902
Impaired loan with no related allowance, average recorded investment 1,044
Impaired loans with related allowance, interest income recognized (cash basis) 38
Impaired loan with no related allowance, interest income recognized (cash basis) 14
Construction  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 0
Impaired loan with no related allowance, average recorded investment 1,221
Impaired loans with related allowance, interest income recognized (cash basis) 0
Impaired loan with no related allowance, interest income recognized (cash basis) 48
Residential real estate: | 1-to-4 family mortgage  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 275
Impaired loan with no related allowance, average recorded investment 656
Impaired loans with related allowance, interest income recognized (cash basis) 2
Impaired loan with no related allowance, interest income recognized (cash basis) 8
Residential real estate: | Residential line of credit  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 0
Impaired loan with no related allowance, average recorded investment 425
Impaired loans with related allowance, interest income recognized (cash basis) 0
Impaired loan with no related allowance, interest income recognized (cash basis) 2
Residential real estate: | Multi-family mortgage  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 0
Impaired loan with no related allowance, average recorded investment 0
Impaired loans with related allowance, interest income recognized (cash basis) 0
Impaired loan with no related allowance, interest income recognized (cash basis) 0
Commercial real estate: | Owner occupied  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 375
Impaired loan with no related allowance, average recorded investment 1,957
Impaired loans with related allowance, interest income recognized (cash basis) 2
Impaired loan with no related allowance, interest income recognized (cash basis) 28
Commercial real estate: | Non-owner occupied  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 5,668
Impaired loan with no related allowance, average recorded investment 1,049
Impaired loans with related allowance, interest income recognized (cash basis) 0
Impaired loan with no related allowance, interest income recognized (cash basis) 0
Consumer and other  
Financing Receivable, Impaired [Line Items]  
Impaired loans with related allowance, average recorded investment 0
Impaired loan with no related allowance, average recorded investment 72
Impaired loans with related allowance, interest income recognized (cash basis) 0
Impaired loan with no related allowance, interest income recognized (cash basis) $ 2