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Loans, Allowance for Credit Losses and Credit Quality - Financing Receivable Past Due (Details) $ in Thousands | Jun. 30, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($)
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Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 466 |  | 480 |  |
Total loans |  | $ 14,400,942 | [1] | $ 14,278,070 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 37 |  | 29 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 38 |  | 40 |  |
Number Of Financing Receivables Total Past Due | loan |  | 541 |  | 549 |  |
Total |  | $ 14,400,942 |  | $ 14,278,070 | $ 14,139,911 |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 6,472 |  | 23,616 |  |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 4,553 |  | 29,433 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 41,623 |  | 10,305 |  |
Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 52,648 |  | 63,354 |  |
Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 14,348,294 |  | $ 14,214,716 |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 5 |  | 6 |  |
Total loans |  | $ 1,602,752 | [1] | $ 1,579,986 |  |
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 |  | 2 |  |
Number Of Financing Receivables Total Past Due | loan |  | 12 |  | 9 |  |
Total |  | $ 1,602,752 |  | $ 1,579,986 | 1,723,219 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 164 |  | 398 |  |
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 147 |  | 17,538 |  |
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 17,782 |  | 673 |  |
Commercial And Industrial [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 18,093 |  | 18,609 |  |
Commercial And Industrial [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 1,584,659 |  | $ 1,561,377 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 4 |  | 8 |  |
Total loans |  | $ 8,151,805 | [1] | $ 8,041,508 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 2 |  | 2 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 3 |  | 3 |  |
Number Of Financing Receivables Total Past Due | loan |  | 9 |  | 13 |  |
Total |  | $ 8,151,805 |  | $ 8,041,508 | 7,812,796 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,483 |  | 14,674 |  |
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,745 |  | 8,419 |  |
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 19,422 |  | 7,279 |  |
Commercial Real Estate [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 22,650 |  | 30,372 |  |
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 8,129,155 |  | $ 8,011,136 |  |
Construction Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 0 |  | 0 |  |
Total loans |  | $ 786,743 | [1] | $ 849,586 |  |
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 |  |
Number Of Financing Receivables Total Past Due | loan |  | 0 |  | 0 |  |
Total |  | $ 786,743 |  | $ 849,586 | 1,022,796 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
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 |  | 0 |  | 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, Past Due |  |  |  |  |  |
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 |  | $ 786,743 |  | $ 849,586 |  |
Small Business [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 9 |  | 6 |  |
Total loans |  | $ 269,270 | [1] | $ 251,956 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 5 |  | 1 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 7 |  | 6 |  |
Number Of Financing Receivables Total Past Due | loan |  | 21 |  | 13 |  |
Total |  | $ 269,270 |  | $ 251,956 | 237,092 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 205 |  | 400 |  |
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 236 |  | 20 |  |
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 122 |  | 243 |  |
Small Business [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 563 |  | 663 |  |
Small Business [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 268,707 |  | $ 251,293 |  |
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 15 |  | 24 |  |
Total loans |  | $ 2,439,646 | [1] | $ 2,424,754 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 9 |  | 7 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 7 |  | 13 |  |
Number Of Financing Receivables Total Past Due | loan |  | 31 |  | 44 |  |
Total |  | $ 2,439,646 |  | $ 2,424,754 | 2,221,284 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 3,422 |  | 6,216 |  |
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 2,037 |  | 2,187 |  |
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 1,583 |  | 1,573 |  |
Residential Real Estate [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 7,042 |  | 9,976 |  |
Residential Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 2,432,604 |  | $ 2,414,778 |  |
Home Equity Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 9 |  | 23 |  |
Total loans | [1] | $ 1,116,807 |  |  |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 4 |  | 4 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 15 |  | 10 |  |
Number Of Financing Receivables Total Past Due | loan |  | 28 |  | 37 |  |
Total |  | $ 1,116,807 |  | $ 1,097,626 | $ 1,095,398 | [1]
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 0 |  | 0 |  |
Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 939 |  | 1,640 |  |
Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 333 |  | 1,238 |  |
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 2,713 |  | 529 |  |
Home Equity Loan [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | 3,985 |  | 3,407 |  |
Home Equity Loan [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans |  | $ 1,112,822 |  | $ 1,094,219 |  |
Consumer - Other [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | [2] | 424 |  | 413 |  |
Total loans |  | $ 33,919 |  | $ 32,654 |  |
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | [2] | 15 |  | 14 |  |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | [2] | 1 |  | 6 |  |
Number Of Financing Receivables Total Past Due | loan | [2] | 440 |  | 433 |  |
Total | [2] | $ 33,919 |  | $ 32,654 |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | [2] | 0 |  | 0 |  |
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 259 |  | 288 |  |
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 55 |  | 31 |  |
Consumer - Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 1 |  | 8 |  |
Consumer - Other [Member] | Financial Asset, Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | 315 |  | 327 |  |
Consumer - Other [Member] | Financial Asset, Not Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | [2] | $ 33,604 |  | $ 32,327 |  |
[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. (2)The amount of net deferred costs on originated loans included in the ending balance was $6.2 million and $6.4 million at June 30, 2024 and December 31, 2023, respectively. Net unamortized discounts on acquired loans included in the ending balance were $8.4 million and $8.6 million at June 30, 2024 and December 31, 2023, respectively.

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