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Loans, Allowance for Credit Losses and Credit Quality Schedule of Debtor Troubled Debt Restructurings, Subsequent Period (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Troubled Debt Restructurings On Financing Receivables Post Modifications  
The following table shows the troubled debt restructurings which occurred for the periods indicated and the change in the recorded investment subsequent to the modifications occurring:
 Year Ended
December 31, 2020
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
 
Troubled debt restructurings
Commercial and industrial8 $732 $732 
Commercial real estate10 2,865 2,865 
Small business10 752 728 
Residential real estate2 559 642 
Total30 $4,908 $4,967 
 Year Ended
December 31, 2019
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
Troubled debt restructurings
Commercial and industrial3 $268 $268 
Commercial real estate4 819 819 
Small business1 14 14 
Residential real estate3 967 1,009 
Home equity2 121 121 
Total13 $2,189 $2,231 

Year Ended
December 31, 2018
Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
Troubled debt restructurings
Commercial and industrial$12 $35,688 $39,224 
Commercial real estate3 1,600 1,600 
Residential real estate5 1,048 1,071 
Home equity9 562 562 
Total$29 $38,898 $42,457 
  
Financing Receivable, Modifications, Number of Contracts | contract 29 30 13
Financing Receivable, Troubled Debt Restructuring, Premodification $ 38,898 $ 4,908 $ 2,189
Post-Modification Outstanding Recorded Investment $ 42,457 $ 4,967 $ 2,231
Commercial And Industrial [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 12 8 3
Financing Receivable, Troubled Debt Restructuring, Premodification $ 35,688 $ 732 $ 268
Post-Modification Outstanding Recorded Investment $ 39,224 $ 732 $ 268
Commercial Real Estate [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 3 10 4
Financing Receivable, Troubled Debt Restructuring, Premodification $ 1,600 $ 2,865 $ 819
Post-Modification Outstanding Recorded Investment $ 1,600 $ 2,865 $ 819
Small Business [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract   10 1
Financing Receivable, Troubled Debt Restructuring, Premodification   $ 752 $ 14
Post-Modification Outstanding Recorded Investment   $ 728 $ 14
Residential Real Estate [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 5 2 3
Financing Receivable, Troubled Debt Restructuring, Premodification $ 1,048 $ 559 $ 967
Post-Modification Outstanding Recorded Investment $ 1,071 $ 642 $ 1,009
Home Equity Line of Credit [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 9   2
Financing Receivable, Troubled Debt Restructuring, Premodification $ 562   $ 121
Post-Modification Outstanding Recorded Investment $ 562   $ 121