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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Allowance for loan losses:          
Beginning Balance $ 26,957 $ 21,930 $ 22,677 $ 21,379 $ 21,379
Charge-offs (1,542) (308) (2,957) (1,258)  
Recoveries 119 70 514 171  
Provisions 1,050 700 6,350 2,100  
Ending balance 26,584 22,392 26,584 22,392 $ 22,677
Allowance for credit losses increase (decrease)     $ 3,900    
Allowance for credit losses increase (decrease) percentage     17.20%    
Percentage of allowance for loan losses     1.21%   1.17%
Percentage of PPP loans to total loans     1.35%    
Allowance for Loan and Lease Losses Write-offs, Net $ 1,400 $ 200 $ 2,400 $ 1,100  
Percentage of allowance for loan losses, charge offs net of recoveries to average loans 0.26% 0.05% 0.16% 0.08%  
Increase (decrease) in charge offs due to a partial write down of a non-accrual commercial relationship $ 900   $ 900    
Increase (decrease) in charge offs due to small business lines of credit 500   900    
Commercial          
Allowance for loan losses:          
Beginning Balance 8,487 $ 6,142 6,888 $ 5,516 $ 5,516
Charge-offs (1,354) (26) (2,339) (113)  
Recoveries 51 12 349 22  
Provisions 1,271 (205) 3,557 498  
Ending balance 8,455 5,923 8,455 5,923 6,888
Real estate Commercial          
Allowance for loan losses:          
Beginning Balance 13,855 11,042 11,496 10,736 10,736
Charge-offs (66) (34) (113) (383)  
Recoveries 14   14    
Provisions (5) 762 2,401 1,417  
Ending balance 13,798 11,770 13,798 11,770 11,496
Real estate Residential          
Allowance for loan losses:          
Beginning Balance 3,567 3,615 3,226 3,892 3,892
Charge-offs (71) (104) (206) (406)  
Recoveries 9 11 22 27  
Provisions (159) 34 304 43  
Ending balance 3,346 3,556 3,346 3,556 3,226
Consumer          
Allowance for loan losses:          
Beginning Balance 1,048 1,131 1,067 1,235 1,235
Charge-offs (51) (144) (299) (356)  
Recoveries 45 47 129 122  
Provisions (57) 109 88 142  
Ending balance $ 985 $ 1,143 $ 985 $ 1,143 $ 1,067