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Allowance for Credit Losses and Credit Quality Information - Analysis of Collateral Dependent and Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property $ 44,522  
Loans with No Related Reserve 30,385  
Loans with Related Reserve 14,137  
Impaired Loans Related Specific Reserve 2,242  
Contractual Principal Balances 51,604  
Impaired Loans Average Loan Balances 50,955  
Acquired impaired loans 7,900  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition 9,000  
Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   $ 38,722
Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   3,186
Total Commercial | Commercial and industrial(1)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 11,900  
Loans with No Related Reserve 9,979  
Loans with Related Reserve 1,921  
Impaired Loans Related Specific Reserve 1,185  
Contractual Principal Balances 14,653  
Impaired Loans Average Loan Balances 17,033  
Total Commercial | Commercial and industrial(1) | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   10,646
Total Commercial | Commercial and industrial(1) | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   3,170
Total Commercial | Owner-occupied commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 5,596  
Loans with No Related Reserve 3,919  
Loans with Related Reserve 1,677  
Impaired Loans Related Specific Reserve 233  
Contractual Principal Balances 6,083  
Impaired Loans Average Loan Balances 7,869  
Total Commercial | Owner-occupied commercial | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   5,360
Total Commercial | Owner-occupied commercial | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   0
Total Commercial | Commercial mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 4,888  
Loans with No Related Reserve 1,753  
Loans with Related Reserve 3,135  
Impaired Loans Related Specific Reserve 65  
Contractual Principal Balances 5,215  
Impaired Loans Average Loan Balances 4,607  
Total Commercial | Commercial mortgages | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   17,175
Total Commercial | Commercial mortgages | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   0
Total Commercial | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 435  
Loans with No Related Reserve 0  
Loans with Related Reserve 435  
Impaired Loans Related Specific Reserve 24  
Contractual Principal Balances 488  
Impaired Loans Average Loan Balances 1,686  
Total Commercial | Construction | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   0
Total Commercial | Construction | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   0
Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 14,119  
Loans with No Related Reserve 8,858  
Loans with Related Reserve 5,261  
Impaired Loans Related Specific Reserve 557  
Contractual Principal Balances 16,721  
Impaired Loans Average Loan Balances 12,031  
Residential | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   3,247
Residential | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   0
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Property 7,584  
Loans with No Related Reserve 5,876  
Loans with Related Reserve 1,708  
Impaired Loans Related Specific Reserve 178  
Contractual Principal Balances 8,444  
Impaired Loans Average Loan Balances $ 7,729  
Consumer | Property    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   2,294
Consumer | Equipment and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral Dependent Loans Receivable At Amortized Cost Basis   $ 16