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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Sep. 30, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
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Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 274 | 447 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 1 | $ 2,157 |
Financing Receivable, Past Due | 29,589 | 25,485 |
Financing Receivable, Not Past Due | 9,375,604 | 8,848,154 |
Loans and Leases Receivable, Gross | $ 9,405,193 | $ 8,873,639 |
Number Of Financing Receivables Total Past Due | loan | 411 | 603 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 30 | 43 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 107 | 113 |
Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 1 | 1 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 4,590 | 1,336 |
Financing Receivable, Not Past Due | 2,057,755 | 1,393,700 |
Loans and Leases Receivable, Gross | $ 2,062,345 | $ 1,395,036 |
Number Of Financing Receivables Total Past Due | loan | 12 | 8 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 6 | 2 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 5 | 5 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 1 | 7 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 218 | [1]
Financing Receivable, Past Due | 9,723 | 3,922 |
Financing Receivable, Not Past Due | 4,115,741 | 3,998,437 |
Loans and Leases Receivable, Gross | $ 4,125,464 | $ 4,002,359 |
Number Of Financing Receivables Total Past Due | loan | 8 | 16 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 2 | 1 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 5 | 8 |
Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 0 | 1 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 0 | 560 |
Financing Receivable, Not Past Due | 573,334 | 546,733 |
Loans and Leases Receivable, Gross | $ 573,334 | $ 547,293 |
Number Of Financing Receivables Total Past Due | loan | 0 | 1 |
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 | 0 | 0 |
Small Business [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 6 | 11 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 1,093 | 967 |
Financing Receivable, Not Past Due | 166,539 | 173,530 |
Loans and Leases Receivable, Gross | $ 167,632 | $ 174,497 |
Number Of Financing Receivables Total Past Due | loan | 22 | 20 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 4 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 12 | 6 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 11 | 17 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 1,652 | [1]
Financing Receivable, Past Due | 9,293 | 12,312 |
Financing Receivable, Not Past Due | 1,343,012 | 1,578,257 |
Loans and Leases Receivable, Gross | $ 1,352,305 | $ 1,590,569 |
Number Of Financing Receivables Total Past Due | loan | 55 | 72 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 7 | 17 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 37 | 38 |
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 18 | 23 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 265 | [1]
Financing Receivable, Past Due | 4,615 | 6,067 |
Financing Receivable, Not Past Due | 1,096,439 | 1,127,731 |
Loans and Leases Receivable, Gross | $ 1,101,054 | $ 1,133,798 |
Number Of Financing Receivables Total Past Due | loan | 62 | 71 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 8 | 8 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 36 | 40 |
Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 237 | 387 | [2]
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 1 | $ 22 | [2]
Financing Receivable, Past Due | 275 | 321 | [2]
Financing Receivable, Not Past Due | 22,784 | 29,766 | [2]
Loans and Leases Receivable, Gross | $ 23,059 | $ 30,087 | [2]
Number Of Financing Receivables Total Past Due | loan | 252 | 415 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 3 | 12 | [2]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 12 | 16 | [2]
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 14,432 | $ 4,155 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 3,608 | 323 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 8,269 | 194 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 455 | 15 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 1,631 | 3,055 |
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 | 468 | 524 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 1 | 44 | [2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 10,902 | 13,819 |
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 | 930 | 760 |
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 | 1,355 | 2,038 |
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 | 124 | 115 |
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 | 5,870 | 7,020 |
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 | 2,566 | 3,854 |
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 | 57 | 32 | [2]
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 4,255 | 7,511 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 52 | 253 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 99 | 1,690 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 560 |
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 514 | 837 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 1,792 | 2,237 |
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 | 1,581 | 1,689 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 217 | $ 245 | [2]
[1] | Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
[2] | Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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