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Loans and Allowance for Credit Losses - Troubled Debt Restructuring by Class (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings $ 12,506 $ 11,333  
Number of loans removed from TDR designation | loan 0    
TDR loans on non-accrual status, value $ 7,400 $ 58  
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 704    
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans removed from TDR designation | loan   1  
Recorded investment of loans removed from TDR resignation   $ 3  
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 1,021 1,223  
Commercial real estate | Commercial real estate, owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 7,147 6,998  
Commercial real estate | Commercial real estate, investor-owned      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 3,305 1,770  
Residential loans | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 281 251  
Number of loans removed from TDR designation | loan     1
Residential loans | Other residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 0 452  
Consumer loans | Installment and other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings $ 752 $ 639