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Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) contract | Jun. 30, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1 | 8
Financing Receivable, Troubled Debt Restructuring, Premodification | [1] | $ 89 | $ 18,301
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] | $ 89 | $ 18,301
Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [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] |  |  |
Financing Receivable, Troubled Debt Restructuring [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] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1 | 2
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 89 | $ 189
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 89 | $ 189
[1] | The pre-modification and post-modification balances represent the legal principal balance of the loan. Activity presented in the table above includes $14.3 million of modifications on existing TDR's occurring during the six months ended June 30, 2021.

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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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