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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, 2019
USD ($)
contract
Dec. 31, 2021
USD ($)
contract
Dec. 31, 2020
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, 2021
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
Troubled debt restructurings(Dollars in thousands)
Commercial and industrial1 $14,148 $14,148 
Commercial real estate5 3,964 3,964 
Small business2 189 189 
Total (1)8 $18,301 $18,301 
 Year Ended
December 31, 2020
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
Troubled debt restructurings(Dollars in thousands)
Commercial and industrial8 $732 $732 
Commercial real estate10 2,865 2,865 
Small business10 752 728 
Residential real estate2 559 642 
Total (1)30 $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(Dollars in thousands)
Commercial and industrial3 $268 $268 
Commercial real estate4 819 819 
Small business1 14 14 
Residential real estate3 967 1,009 
Home equity2 121 121 
Total (1)13 $2,189 $2,231 
(1)The pre-modification and post-modification balances represent the legal principal balance of the loan. Activity presented in the tables above includes $14.3 million, $1.9 million, and $855,000 of modifications on existing TDRs during the years ended December 31, 2021, 2020 and 2019, respectively.
  
Financing Receivable, Modifications, Number of Contracts | contract 13 8 30
Financing Receivable, Troubled Debt Restructuring, Premodification $ 2,189 $ 18,301 $ 4,908
Post-Modification Outstanding Recorded Investment $ 2,231 $ 18,301 $ 4,967
Commercial And Industrial [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 3 1 8
Financing Receivable, Troubled Debt Restructuring, Premodification $ 268 $ 14,148 $ 732
Post-Modification Outstanding Recorded Investment $ 268 $ 14,148 $ 732
Commercial Real Estate [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 4 5 10
Financing Receivable, Troubled Debt Restructuring, Premodification $ 819 $ 3,964 $ 2,865
Post-Modification Outstanding Recorded Investment $ 819 $ 3,964 $ 2,865
Small Business [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 1 2 10
Financing Receivable, Troubled Debt Restructuring, Premodification $ 14 $ 189 $ 752
Post-Modification Outstanding Recorded Investment $ 14 $ 189 $ 728
Residential Real Estate [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 3   2
Financing Receivable, Troubled Debt Restructuring, Premodification $ 967   $ 559
Post-Modification Outstanding Recorded Investment $ 1,009   $ 642
Home Equity Line of Credit [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 2    
Financing Receivable, Troubled Debt Restructuring, Premodification $ 121    
Post-Modification Outstanding Recorded Investment $ 121