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Loans and allowance for credit losses - Interest Income Recognized on Non-accrual Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans $ 385 $ 227
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 114 152
Construction    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 14 27
Residential real estate | 1-to-4 family mortgage    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 18 7
Residential real estate | Residential line of credit    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 18 1
Residential real estate | Multi-family mortgage    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 1 0
Commercial real estate | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans 131 21
Commercial real estate | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Interest income recognized on non-accrual loans $ 89 $ 19