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Loans and allowance for loan losses - Impaired Loans Recognized, Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment $ 10,568 $ 4,122 $ 1,992
Impaired loan with no related allowance, average recorded investment 8,197 7,423 9,175
Total impaired loans, average recorded investment 18,765 11,545 11,167
Impaired loans with related allowance, interest income recognized (cash basis) 624 175 64
Impaired loan with no related allowance, interest income recognized (cash basis) 575 418 335
Total impaired loans, interest income recognized (cash basis) 1,199 593 399
Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 3,349 335 454
Impaired loan with no related allowance, average recorded investment 2,088 1,377 1,074
Impaired loans with related allowance, interest income recognized (cash basis) 474 121 2
Impaired loan with no related allowance, interest income recognized (cash basis) 201 70 38
Construction      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 0 0 0
Impaired loan with no related allowance, average recorded investment 1,641 1,255 1,988
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 167 74 46
Residential real estate: | 1-to-4 family mortgage      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 205 170 149
Impaired loan with no related allowance, average recorded investment 963 955 1,718
Impaired loans with related allowance, interest income recognized (cash basis) 13 9 9
Impaired loan with no related allowance, interest income recognized (cash basis) 68 74 63
Residential real estate: | Residential line of credit      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 160 0 0
Impaired loan with no related allowance, average recorded investment 252 123 156
Impaired loans with related allowance, interest income recognized (cash basis) 1 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 1 15 0
Residential real estate: | Multi-family mortgage      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 0 0 0
Impaired loan with no related allowance, average recorded investment 0 489 1,003
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) 0 26 46
Commercial real estate: | Owner occupied      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 658 702 740
Impaired loan with no related allowance, average recorded investment 2,143 1,862 1,897
Impaired loans with related allowance, interest income recognized (cash basis) 27 43 48
Impaired loan with no related allowance, interest income recognized (cash basis) 133 148 122
Commercial real estate: | Non-owner occupied      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 6,196 2,915 648
Impaired loan with no related allowance, average recorded investment 1,049 1,313 1,313
Impaired loans with related allowance, interest income recognized (cash basis) 109 2 5
Impaired loan with no related allowance, interest income recognized (cash basis) 0 7 19
Consumer and other      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, average recorded investment 0 0 1
Impaired loan with no related allowance, average recorded investment 61 49 26
Impaired loans with related allowance, interest income recognized (cash basis) 0 0 0
Impaired loan with no related allowance, interest income recognized (cash basis) $ 5 $ 4 $ 1