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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Mar. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 420 | 447 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 25 | $ 2,157 |
Financing Receivable, Past Due | 29,357 | 25,485 |
Financing Receivable, Not Past Due | 8,887,073 | 8,848,154 |
Loans and Leases Receivable, Gross | $ 8,916,430 | $ 8,873,639 |
Number Of Financing Receivables Total Past Due | loan | 562 | 603 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 33 | 43 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 109 | 113 |
Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 13 | 1 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 3,008 | 1,336 |
Financing Receivable, Not Past Due | 1,445,216 | 1,393,700 |
Loans and Leases Receivable, Gross | $ 1,448,224 | $ 1,395,036 |
Number Of Financing Receivables Total Past Due | loan | 19 | 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 | 18 | 7 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 218 | [1]
Financing Receivable, Past Due | 8,871 | 3,922 |
Financing Receivable, Not Past Due | 4,052,476 | 3,998,437 |
Loans and Leases Receivable, Gross | $ 4,061,347 | $ 4,002,359 |
Number Of Financing Receivables Total Past Due | loan | 27 | 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 | 7 | 8 |
Construction Loans [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 | 331 | 560 |
Financing Receivable, Not Past Due | 526,807 | 546,733 |
Loans and Leases Receivable, Gross | $ 527,138 | $ 547,293 |
Number Of Financing Receivables Total Past Due | loan | 1 | 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 | 12 | 11 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 0 |
Financing Receivable, Past Due | 1,391 | 967 |
Financing Receivable, Not Past Due | 176,429 | 173,530 |
Loans and Leases Receivable, Gross | $ 177,820 | $ 174,497 |
Number Of Financing Receivables Total Past Due | loan | 25 | 20 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 8 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 5 | 6 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | 19 | 17 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 1,652 | [1]
Financing Receivable, Past Due | 9,866 | 12,312 |
Financing Receivable, Not Past Due | 1,518,550 | 1,578,257 |
Loans and Leases Receivable, Gross | $ 1,528,416 | $ 1,590,569 |
Number Of Financing Receivables Total Past Due | loan | 63 | 72 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 5 | 17 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 39 | 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 | 22 | 23 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 | $ 265 | [1]
Financing Receivable, Past Due | 5,338 | 6,067 |
Financing Receivable, Not Past Due | 1,140,932 | 1,127,731 |
Loans and Leases Receivable, Gross | $ 1,146,270 | $ 1,133,798 |
Number Of Financing Receivables Total Past Due | loan | 65 | 71 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 7 | 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 | 335 | 387 | [2]
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 25 | $ 22 | [2]
Financing Receivable, Past Due | 552 | 321 | [2]
Financing Receivable, Not Past Due | 26,663 | 29,766 | [2]
Loans and Leases Receivable, Gross | $ 27,215 | $ 30,087 | [2]
Number Of Financing Receivables Total Past Due | loan | 362 | 415 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | 11 | 12 | [2]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | 16 | 16 | [2]
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 2,430 | $ 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 | 383 | 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 | 185 | 15 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 994 | 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 | 801 | 524 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 67 | 44 | [2]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 12,140 | 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 | 1,078 | 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 | 1,499 | 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 | 176 | 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 | 6,258 | 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 | 3,030 | 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 | 99 | 32 | [2]
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 14,787 | 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 | 1,930 | 253 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 6,989 | 1,690 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 331 | 560 |
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 1,030 | 837 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 2,614 | 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 | 1,507 | 1,689 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 386 | $ 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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