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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Mar. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($)
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 226 | 301 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 1 | $ 1 |
Financing Receivable, Past Due |  | 11,024 | 21,396 |
Financing Receivable, Not Past Due |  | 9,235,667 | 9,371,470 |
Loans and Leases Receivable, Gross |  | $ 9,246,691 | $ 9,392,866 | $ 8,916,430
Number Of Financing Receivables Total Past Due | loan |  | 312 | 408 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 7 | 25 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 79 | 82 |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 6 | 2 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 651 | 1,775 |
Financing Receivable, Not Past Due |  | 2,086,020 | 2,101,377 |
Loans and Leases Receivable, Gross |  | $ 2,086,671 | $ 2,103,152 | 1,448,224
Number Of Financing Receivables Total Past Due | loan |  | 16 | 11 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 0 | 1 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 10 | 8 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 3 | 3 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 1,399 | 924 |
Financing Receivable, Not Past Due |  | 4,176,218 | 4,173,003 |
Loans and Leases Receivable, Gross |  | $ 4,177,617 | $ 4,173,927 | 4,061,347
Number Of Financing Receivables Total Past Due | loan |  | 7 | 7 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 0 | 0 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 4 | 4 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 0 | 0 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 0 | 2,794 |
Financing Receivable, Not Past Due |  | 516,362 | 551,135 |
Loans and Leases Receivable, Gross |  | $ 516,362 | $ 553,929 | 527,138
Number Of Financing Receivables Total Past Due | loan |  | 0 | 2 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 0 | 2 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 0 | 0 |
Small Business [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 5 | 14 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 94 | 753 |
Financing Receivable, Not Past Due |  | 174,117 | 174,270 |
Loans and Leases Receivable, Gross |  | $ 174,211 | $ 175,023 | 177,820
Number Of Financing Receivables Total Past Due | loan |  | 9 | 24 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 1 | 6 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 3 | 4 |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 9 | 12 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 5,853 | 11,305 |
Financing Receivable, Not Past Due |  | 1,235,936 | 1,284,878 |
Loans and Leases Receivable, Gross |  | $ 1,241,789 | $ 1,296,183 | $ 1,528,416
Number Of Financing Receivables Total Past Due | loan |  | 40 | 47 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 3 | 8 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 28 | 27 |
Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 7 | 10 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Financing Receivable, Past Due |  | 2,729 | 3,569 |
Financing Receivable, Not Past Due |  | 1,025,766 | 1,065,221 |
Loans and Leases Receivable, Gross |  | $ 1,028,495 | $ 1,068,790 |
Number Of Financing Receivables Total Past Due | loan |  | 36 | 48 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 2 | 5 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 27 | 33 |
Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | [1] | 196 | 260 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | [1] | $ 1 | $ 1 |
Financing Receivable, Past Due | [1] | 298 | 276 |
Financing Receivable, Not Past Due | [1] | 21,248 | 21,586 |
Loans and Leases Receivable, Gross | [1] | $ 21,546 | $ 21,862 |
Number Of Financing Receivables Total Past Due | loan | [1] | 204 | 269 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | [1] | 1 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | [1] | 7 | 6 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | $ 854 | $ 9,450 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 0 | 672 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 0 | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 0 | 2,794 |
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 2 | 273 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 764 | 5,507 |
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 87 | 203 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due | [1] | 1 | 1 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 6,872 | 7,778 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 141 | 785 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 511 | 515 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 0 | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 36 | 59 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 3,837 | 3,648 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 2,217 | 2,633 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due | [1] | 130 | 138 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 3,298 | 4,168 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 510 | 318 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 888 | 409 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 0 | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 56 | 421 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 1,252 | 2,150 |
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due |  | 425 | 733 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Past Due | [1] | $ 167 | $ 137 |
[1] | Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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