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Loans and Allowance for Credit Losses - Summary of charge-offs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2023     $ 39  
Current period gross charge-off, 2022     2  
Current period gross charge-off, 2021     37  
Current period gross charge-off, 2020     38  
Current period gross charge-off, 2019     251  
Current period gross charge-off, Prior     149  
Current period gross charge-off, Total $ 151 $ 747 516 $ 1,466
Commercial        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2023     39  
Current period gross charge-off, 2021     28  
Current period gross charge-off, 2020     11  
Current period gross charge-off, 2019     247  
Current period gross charge-off, Prior     69  
Current period gross charge-off, Total 134 672 394 1,336
Commercial | Commercial and industrial        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2023     39  
Current period gross charge-off, 2021     28  
Current period gross charge-off, 2020     11  
Current period gross charge-off, 2019     247  
Current period gross charge-off, Prior     69  
Current period gross charge-off, Total 134 672 394 1,336
Consumer        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2022     2  
Current period gross charge-off, 2021     9  
Current period gross charge-off, 2020     27  
Current period gross charge-off, 2019     4  
Current period gross charge-off, Prior     80  
Current period gross charge-off, Total 17 75 122 130
Consumer | Other revolving and installment        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2022     2  
Current period gross charge-off, 2020     27  
Current period gross charge-off, 2019     4  
Current period gross charge-off, Prior     3  
Current period gross charge-off, Total 8 $ 75 36 $ 130
Consumer | Real estate first mortgage        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, 2021     9  
Current period gross charge-off, Total     9  
Consumer | Real estate first mortgage | Residential        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, Total $ 9   9  
Consumer | Real estate junior lien        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, Prior     77  
Current period gross charge-off, Total     77  
Consumer | Real estate junior lien | Residential        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-off, by Origination Year [Abstract]        
Current period gross charge-off, Total     $ 77