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Loans, Allowance for Credit Losses and Credit Quality - Financing Receivable Past Due (Details) $ in Thousands | Sep. 30, 2025 USD ($) loan | Dec. 31, 2024 USD ($) loan
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Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 570 | 761 |
Total loans | [1] | $ 18,452,443 | $ 14,508,378 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 44 | 28 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 84 | 37 |
Number Of Financing Receivables Total Past Due | loan |  | 698 | 826 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 34,194 | $ 47,521 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 26,201 | 2,201 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 30,247 | 37,686 |
Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 90,642 | 87,408 |
Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 18,361,801 | $ 14,420,970 |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 34 | 125 |
Total loans | [1],[3] | $ 4,532,294 | $ 3,246,455 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 17 | 5 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 33 | 8 |
Number Of Financing Receivables Total Past Due | loan |  | 84 | 138 |
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 8,630 | $ 5,864 |
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 10,081 | 29 |
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 10,018 | 13,872 |
Commercial And Industrial [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 28,729 | 19,765 |
Commercial And Industrial [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 4,503,565 | $ 3,226,690 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 18 | 4 |
Total loans | [1],[3] | $ 8,241,458 | $ 6,839,705 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 2 | 0 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 7 | 3 |
Number Of Financing Receivables Total Past Due | loan |  | 27 | 7 |
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 8,715 | $ 33,860 |
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 1,489 | 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 |  | 6,907 | 20,458 |
Commercial Real Estate [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 17,111 | 54,318 |
Commercial Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 8,224,347 | $ 6,785,387 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 3 | 0 |
Total loans | [1] | $ 1,439,876 | $ 782,078 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 3 | 0 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 2 | 0 |
Number Of Financing Receivables Total Past Due | loan |  | 8 | 0 |
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 8,867 | $ 0 |
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 10,737 | 0 |
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 7,722 | 0 |
Construction Loans [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 27,326 | 0 |
Construction Loans [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 1,412,550 | $ 782,078 |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 21 | 27 |
Total loans | [1] | $ 2,917,101 | $ 2,460,600 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 10 | 9 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 16 | 10 |
Number Of Financing Receivables Total Past Due | loan |  | 47 | 46 |
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 5,086 | $ 6,310 |
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 3,031 | 1,401 |
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 3,489 | 2,224 |
Residential Real Estate [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 11,606 | 9,935 |
Residential Real Estate [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 2,905,495 | $ 2,450,665 |
Home Equity Loan [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan |  | 22 | 9 |
Total loans | [1] | $ 1,284,139 | $ 1,140,168 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan |  | 6 | 11 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan |  | 19 | 10 |
Number Of Financing Receivables Total Past Due | loan |  | 47 | 30 |
Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 2,583 | $ 1,046 |
Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 854 | 764 |
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 2,105 | 1,126 |
Home Equity Loan [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | 5,542 | 2,936 |
Home Equity Loan [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans |  | $ 1,278,597 | $ 1,137,232 |
Consumer - Other [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan | [4] | 472 | 596 |
Total loans | [4] | $ 37,575 | $ 39,372 | [2]
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan | [4] | 6 | 3 |
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan | [4] | 7 | 6 |
Number Of Financing Receivables Total Past Due | loan | [4] | 485 | 605 |
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans | [4] | $ 313 | $ 441 |
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans | [4] | 9 | 7 |
Consumer - Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans | [4] | 6 | 6 |
Consumer - Other [Member] | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans | [4] | 328 | 454 |
Consumer - Other [Member] | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total loans | [4] | $ 37,247 | $ 38,918 |
[1] | (2)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] | The amount of net deferred fees/costs on originated loans included in the ending balance was $7.2 million and $6.1 million at September 30, 2025 and December 31, 2024, respectively. Net unamortized discounts on acquired loans included in the ending balance were $163.1 million and $8.1 million at September 30, 2025 and December 31, 2024, respectively.
[3] | (1)Commercial and industrial and commercial real estate balances as of September 30, 2025 presented above vary from amounts previously reported in the Company’s third quarter 2025 earnings release. These reported amounts reflect a reclassification of commercial and industrial loan balances to the commercial real estate category based upon further review of loan classifications subsequent to the system conversion of Enterprise Bancorp, Inc., parent of Enterprise Bank and Trust Company (collectively “Enterprise”). Reported amounts throughout this Form 10-Q are reflective of this reclassification, where applicable.
[4] | Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2)The amount of net deferred fees/costs on originated loans included in the ending balance was $7.2 million and $6.1 million at September 30, 2025 and December 31, 2024, respectively. Net unamortized discounts on acquired loans included in the ending balance were $163.1 million and $8.1 million at September 30, 2025 and December 31, 2024, respectively.

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