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Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) contract | Mar. 31, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 7 | 5
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 18,212 | $ 1,098
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 18,212 | $ 1,106
Commercial And Industrial [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 2
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 14,148 | $ 268
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 14,148 | $ 268
Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 5 | 1
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 3,964 | $ 604
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 3,964 | $ 604
Small Business [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 | 1
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 100 | $ 49
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 100 | $ 25
Residential Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 177
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 209

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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=121611835&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=121611835&loc=SL6953676-111524 + Details
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