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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands | Sep. 30, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Sep. 30, 2021 USD ($)
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Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 559 |  | 518 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 13,700,350 | [1] | $ 13,587,286 | $ 8,808,013 |
Number Of Financing Receivables Total Past Due | loan |  | 676 |  | 701 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 60 |  | 60 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 57 |  | 123 |  |
Total loans |  | $ 13,700,350 |  | $ 13,587,286 |  |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 10,164 |  | 37,927 |  |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 8,571 |  | 1,677 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 4,202 |  | 7,092 |  |
Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 13,677,413 |  | 13,540,590 |  |
Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 22,937 |  | $ 46,696 |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 10 |  | 7 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 1,548,349 | [1] | $ 1,563,279 | 1,640,709 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 14 |  | 11 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 1 |  | 2 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 3 |  | 2 |  |
Total loans |  | $ 1,548,349 |  | $ 1,563,279 |  |
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 322 |  | 143 |  |
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 182 |  | 252 |  |
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 558 |  | 24 |  |
Commercial And Industrial [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,547,287 |  | 1,562,860 |  |
Commercial And Industrial [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 1,062 |  | $ 419 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 9 |  | 15 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 7,677,917 | [1] | $ 7,992,344 | 4,221,259 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 16 |  | 19 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 5 |  | 0 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 2 |  | 4 |  |
Total loans |  | $ 7,677,917 |  | $ 7,992,344 |  |
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 5,419 |  | 32,845 |  |
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 4,491 |  | 0 |  |
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 208 |  | 1,339 |  |
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 7,667,799 |  | 7,958,160 |  |
Commercial Real Estate [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 10,118 |  | $ 34,184 |  |
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 |  | $ 1,185,157 | [1] | $ 1,165,457 | 515,415 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 1 |  | 0 |  |
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 |  |
Total loans |  | $ 1,185,157 |  | $ 1,165,457 |  |
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 0 |  | 0 |  |
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,661 |  | 0 |  |
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 0 |  | 0 |  |
Construction Loans [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,183,496 |  | 1,165,457 |  |
Construction Loans [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 1,661 |  | $ 0 |  |
Small Business [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 7 |  | 11 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 209,567 | [1] | $ 193,189 | 184,138 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 16 |  | 21 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 3 |  | 6 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 6 |  | 4 |  |
Total loans |  | $ 209,567 |  | $ 193,189 |  |
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 233 |  | 136 |  |
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 15 |  | 53 |  |
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 29 |  | 24 |  |
Small Business [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 209,290 |  | 192,976 |  |
Small Business [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 277 |  | $ 213 |  |
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 15 |  | 12 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 1,959,254 | [1] | $ 1,604,686 | 1,222,849 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 40 |  | 93 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 6 |  | 5 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 19 |  | 76 |  |
Total loans |  | $ 1,959,254 |  | $ 1,604,686 |  |
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 3,146 |  | 2,709 |  |
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,202 |  | 714 |  |
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,804 |  | 3,922 |  |
Residential Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,953,102 |  | 1,597,341 |  |
Residential Real Estate [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 6,152 |  | $ 7,345 |  |
Home Equity Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 14 |  | 15 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross |  | $ 1,087,170 | [1] | $ 1,039,611 | $ 1,000,468 | [1]
Number Of Financing Receivables Total Past Due | loan |  | 41 |  | 42 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 8 |  | 6 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 19 |  | 21 |  |
Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 534 |  | $ 1,375 |  |
Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 775 |  | 381 |  |
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,577 |  | 1,671 |  |
Home Equity Loan [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,084,284 |  | 1,036,184 |  |
Home Equity Loan [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 2,886 |  | $ 3,427 |  |
Consumer - Other [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | [2] | 504 |  | 458 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | [2] | $ 0 |  | $ 0 |  |
Loans and Leases Receivable, Gross | [2] | $ 32,936 |  | $ 28,720 |  |
Number Of Financing Receivables Total Past Due | loan | [2] | 548 |  | 515 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | [2] | 36 |  | 41 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | [2] | 8 |  | 16 |  |
Total loans |  | $ 32,936 |  | $ 28,720 |  |
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 510 |  | 719 |  |
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 245 |  | 277 |  |
Consumer - Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 26 |  | 112 |  |
Consumer - Other [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 32,155 |  | 27,612 |  |
Consumer - Other [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | $ 781 |  | $ 1,108 |  |
[1] | Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.
[2] | Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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