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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Jun. 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 | 206 | 447 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 58 | $ 2,157 |
Financing Receivable, Past Due | 22,770 | 25,485 |
Financing Receivable, Not Past Due | 9,336,878 | 8,848,154 |
Loans and Leases Receivable, Gross | $ 9,359,648 | $ 8,873,639 |
Number Of Financing Receivables Total Past Due | loan | 367 | 603 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 48 | 43 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 113 | 113 |
Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 2 | 1 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 1,077 | 1,336 |
Financing Receivable, Not Past Due | 2,003,568 | 1,393,700 |
Loans and Leases Receivable, Gross | $ 2,004,645 | $ 1,395,036 |
Number Of Financing Receivables Total Past Due | loan | 8 | 8 |
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 | 6 | 5 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 5 | 7 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 218 | [1]
Financing Receivable, Past Due | 4,553 | 3,922 |
Financing Receivable, Not Past Due | 4,066,494 | 3,998,437 |
Loans and Leases Receivable, Gross | $ 4,071,047 | $ 4,002,359 |
Number Of Financing Receivables Total Past Due | loan | 11 | 16 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 1 | 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 | 510 | 560 |
Financing Receivable, Not Past Due | 537,278 | 546,733 |
Loans and Leases Receivable, Gross | $ 537,788 | $ 547,293 |
Number Of Financing Receivables Total Past Due | loan | 1 | 1 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 1 | 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 | 13 | 11 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 1,493 | 967 |
Financing Receivable, Not Past Due | 168,795 | 173,530 |
Loans and Leases Receivable, Gross | $ 170,288 | $ 174,497 |
Number Of Financing Receivables Total Past Due | loan | 41 | 20 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 17 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 11 | 6 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 15 | 17 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 1,652 | [1]
Financing Receivable, Past Due | 10,399 | 12,312 |
Financing Receivable, Not Past Due | 1,420,730 | 1,578,257 |
Loans and Leases Receivable, Gross | $ 1,431,129 | $ 1,590,569 |
Number Of Financing Receivables Total Past Due | loan | 61 | 72 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 8 | 17 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 38 | 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 | 8 | 23 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 265 | [1]
Financing Receivable, Past Due | 4,428 | 6,067 |
Financing Receivable, Not Past Due | 1,116,095 | 1,127,731 |
Loans and Leases Receivable, Gross | $ 1,120,523 | $ 1,133,798 |
Number Of Financing Receivables Total Past Due | loan | 56 | 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 | 40 | 40 |
Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 163 | 387 | [2]
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 58 | $ 22 | [2]
Financing Receivable, Past Due | 310 | 321 | [2]
Financing Receivable, Not Past Due | 23,918 | 29,766 | [2]
Loans and Leases Receivable, Gross | $ 24,228 | $ 30,087 | [2]
Number Of Financing Receivables Total Past Due | loan | 189 | 415 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 13 | 12 | [2]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 13 | 16 | [2]
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 2,976 | $ 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 | 0 | 323 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 68 | 194 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 510 | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 453 | 15 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 1,247 | 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 | 671 | 524 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 27 | 44 | [2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 11,733 | 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 | 1,045 | 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 | 935 | 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 | 123 | 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 | 6,333 | 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 | 3,203 | 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 | 94 | 32 | [2]
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 8,061 | 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 | 32 | 253 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 3,550 | 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 | 917 | 837 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 2,819 | 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 | 554 | 1,689 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 189 | $ 245 | [2]
[1] | (2) Represents purchased credit impaired loans that were accruing interest due to expectations of future cash collections.
[2] | (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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