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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Jun. 30, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Jun. 30, 2020 USD ($)
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 264 | 301 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 1 |
Loans and Leases Receivable, Gross |  | $ 8,938,988 | $ 9,392,866 | $ 9,359,648
Number Of Financing Receivables Total Past Due | loan |  | 325 | 408 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 11 | 25 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 50 | 82 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 3,516 | $ 4,168 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 896 | 9,450 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 5,231 | 7,778 |
Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 8,929,345 | 9,371,470 |
Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 9,643 | $ 21,396 |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 4 | 2 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Loans and Leases Receivable, Gross |  | $ 1,726,498 | $ 2,103,152 | 2,004,645
Number Of Financing Receivables Total Past Due | loan |  | 4 | 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 |  | 0 | 8 |
Financing Receivable, before Allowance for Credit Loss |  | $ 1,726,498 | $ 2,103,152 |
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,384 | 318 |
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 | 672 |
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 | 785 |
Commercial And Industrial [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,725,114 | 2,101,377 |
Commercial And Industrial [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 1,384 | $ 1,775 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 2 | 3 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Loans and Leases Receivable, Gross |  | $ 4,251,543 | $ 4,173,927 | 4,071,047
Number Of Financing Receivables Total Past Due | loan |  | 6 | 7 |
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 |  | 3 | 4 |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,251,543 | $ 4,173,927 |
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 202 | 409 |
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 162 | 0 |
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 291 | 515 |
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 4,250,888 | 4,173,003 |
Commercial Real Estate [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 655 | $ 924 |
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 |
Loans and Leases Receivable, Gross |  | $ 496,539 | $ 553,929 | 537,788
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 |
Financing Receivable, before Allowance for Credit Loss |  | $ 496,539 | $ 553,929 |
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 | 0 |
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 | 2,794 |
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 | 0 |
Construction Loans [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 496,539 | 551,135 |
Construction Loans [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 0 | $ 2,794 |
Small Business [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 4 | 14 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Loans and Leases Receivable, Gross |  | $ 182,863 | $ 175,023 | 170,288
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 |  | 4 | 4 |
Financing Receivable, before Allowance for Credit Loss |  | $ 182,863 | $ 175,023 |
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 18 | 421 |
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 61 | 273 |
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 32 | 59 |
Small Business [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 182,752 | 174,270 |
Small Business [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 111 | $ 753 |
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 |
Loans and Leases Receivable, Gross |  | $ 1,240,279 | $ 1,296,183 | $ 1,431,129
Number Of Financing Receivables Total Past Due | loan |  | 33 | 47 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 2 | 8 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 22 | 27 |
Financing Receivable, before Allowance for Credit Loss |  | $ 1,240,279 | $ 1,296,183 |
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,167 | 2,150 |
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 153 | 5,507 |
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 3,223 | 3,648 |
Residential Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,235,736 | 1,284,878 |
Residential Real Estate [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,543 | $ 11,305 |
Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 12 | 10 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 | $ 0 |
Loans and Leases Receivable, Gross |  | $ 1,018,408 | $ 1,068,790 |
Number Of Financing Receivables Total Past Due | loan |  | 39 | 48 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 7 | 5 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 20 | 33 |
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 572 | $ 733 |
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 520 | 203 |
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,684 | 2,633 |
Home Equity Line of Credit [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,015,632 | 1,065,221 |
Home Equity Line of Credit [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 2,776 | $ 3,569 |
Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | [1] | 233 | 260 |
Financing Receivable, 90 Days or More Past Due, Still Accruing | [1] | $ 0 | $ 1 |
Loans and Leases Receivable, Gross | [1] | $ 22,858 | $ 21,862 |
Number Of Financing Receivables Total Past Due | loan | [1] | 234 | 269 |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | [1] | 0 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | [1] | 1 | 6 |
Financing Receivable, before Allowance for Credit Loss |  | $ 22,858 | $ 21,862 |
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] | 173 | 137 |
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] | 0 | 1 |
Consumer - Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] | 1 | 138 |
Consumer - Other [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] | 22,684 | 21,586 |
Consumer - Other [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] | $ 174 | $ 276 |
[1] | Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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