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Allowance for Credit Losses - Loans Modified in Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
subsidiary
Dec. 31, 2019
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 5 5
Pre- Modification Outstanding Recorded Investment $ 345 $ 2,362
Post-Modification Outstanding Recorded Investment $ 345 $ 2,362
Number of loans Defaulted TDRs | loan 2 1
Post- Modification Outstanding Recorded Investment TDRs $ 124 $ 93
Commercial and Industrial | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans 1 2
Pre- Modification Outstanding Recorded Investment $ 24 $ 604
Post-Modification Outstanding Recorded Investment $ 24 $ 604
Number of loans Defaulted TDRs 0 0
Post- Modification Outstanding Recorded Investment TDRs $ 0 $ 0
Mortgages    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | subsidiary 2  
Pre- Modification Outstanding Recorded Investment $ 274  
Post-Modification Outstanding Recorded Investment $ 274  
Number of loans Defaulted TDRs | subsidiary 1  
Post- Modification Outstanding Recorded Investment TDRs $ 37  
Commercial real estate | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan   1
Pre- Modification Outstanding Recorded Investment   $ 1,577
Post-Modification Outstanding Recorded Investment   $ 1,577
Number of loans Defaulted TDRs | loan   0
Post- Modification Outstanding Recorded Investment TDRs   $ 0
Residential real estate | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 1 2
Pre- Modification Outstanding Recorded Investment $ 43 $ 181
Post-Modification Outstanding Recorded Investment $ 43 $ 181
Number of loans Defaulted TDRs | loan 1 1
Post- Modification Outstanding Recorded Investment TDRs $ 87 $ 93
Consumer and other | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 1  
Pre- Modification Outstanding Recorded Investment $ 4  
Post-Modification Outstanding Recorded Investment $ 4  
Number of loans Defaulted TDRs | loan 0  
Post- Modification Outstanding Recorded Investment TDRs $ 0