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Loans, Allowance for Credit Losses and Credit Quality Schedule of Debtor Troubled Debt Restructurings, Subsequent Period (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) contract | Mar. 31, 2021 USD ($) contract
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 | 7
Financing Receivable, Troubled Debt Restructuring, Premodification | [1] |  | $ 18,212
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] |  | $ 18,212
Commercial And Industrial [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0 | $ 14,148
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 0 | $ 14,148
Commercial Real Estate [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 | 5
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0 | $ 3,964
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 0 | $ 3,964
Small Business [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0 | $ 100
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 0 | $ 100
Residential Real Estate [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 |
Home Equity Line of Credit [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 |
Consumer - Other [Member] |  |  |
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 0 |
[1] | The pre-modification and post-modification balances represent the legal principal balance of the loan. During the three months ended March 31, 2021, there were two relationships amounting to $14.3 million that related to additional modifications on previously existing TDRs.

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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