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Allowance for Credit Losses - Loans Modified in Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1 2 1 4
Pre- Modification Outstanding Recorded Investment $ 112 $ 200 $ 112 $ 321
Post-Modification Outstanding Recorded Investment $ 112 $ 200 $ 112 $ 321
Number of Loans | loan 1,000 0 1 2
Post- Modification Outstanding Recorded Investment $ 201 $ 0 $ 201 $ 124
Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan   1    
Pre- Modification Outstanding Recorded Investment   $ 196    
Post-Modification Outstanding Recorded Investment   $ 196    
Number of Loans | loan   0    
Post- Modification Outstanding Recorded Investment   $ 0    
Residential real estate | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1   1 2
Pre- Modification Outstanding Recorded Investment $ 112   $ 112 $ 121
Post-Modification Outstanding Recorded Investment $ 112   $ 112 $ 121
Number of Loans | loan 1,000   1 0
Post- Modification Outstanding Recorded Investment $ 201   $ 201 $ 87
Consumer and Other        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan   1   1
Pre- Modification Outstanding Recorded Investment   $ 4   $ 4
Post-Modification Outstanding Recorded Investment   $ 4   $ 4
Number of Loans | loan   0   0
Post- Modification Outstanding Recorded Investment   $ 0   $ 0
Commercial Real Estate | Commercial real estate other        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan       1
Pre- Modification Outstanding Recorded Investment       $ 196
Post-Modification Outstanding Recorded Investment       $ 196
Number of Loans | loan       1
Post- Modification Outstanding Recorded Investment       $ 37