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Loans, Allowance for Credit Losses and Credit Quality - Financing Receivable Past Due (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
loan
Sep. 30, 2023
USD ($)
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 472 480  
Total loans $ 14,360,807 [1] $ 14,278,070  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 27 29  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 37 40  
Number Of Financing Receivables Total Past Due | loan 536 549  
Total $ 14,360,807 $ 14,278,070 $ 14,224,235
Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 7,716 23,616  
Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 3,965 29,433  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 36,384 10,305  
Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 48,065 63,354  
Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 14,312,742 $ 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 3 6  
Total loans $ 1,577,861 [1] $ 1,579,986  
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 5 2  
Number Of Financing Receivables Total Past Due | loan 8 9  
Total $ 1,577,861 $ 1,579,986 1,653,003 [1]
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 200 398  
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 0 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 12,005 673  
Commercial And Industrial [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 12,205 18,609  
Commercial And Industrial [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 1,565,656 $ 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 5 8  
Total loans $ 8,162,020 [1] $ 8,041,508  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 3 2  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 3 3  
Number Of Financing Receivables Total Past Due | loan 11 13  
Total $ 8,162,020 $ 8,041,508 7,896,230 [1]
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 1,839 14,674  
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 2,056 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 20,657 7,279  
Commercial Real Estate [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 24,552 30,372  
Commercial Real Estate [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 8,137,468 $ 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 $ 742,042 [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 $ 742,042 $ 849,586 965,442 [1]
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 $ 742,042 $ 849,586  
Small Business [Member]      
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 11 6  
Total loans $ 270,018 [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 8 6  
Number Of Financing Receivables Total Past Due | loan 24 13  
Total $ 270,018 $ 251,956 245,335 [1]
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 397 400  
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 71 20  
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 153 243  
Small Business [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 621 663  
Small Business [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 269,397 $ 251,293  
Residential Real Estate [Member]      
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 19 24  
Total loans $ 2,441,859 [1] $ 2,424,754  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 8 7  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 9 13  
Number Of Financing Receivables Total Past Due | loan 36 44  
Total $ 2,441,859 $ 2,424,754 2,338,102 [1]
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 3,624 6,216  
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 1,597 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 1,617 1,573  
Residential Real Estate [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 6,838 9,976  
Residential Real Estate [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 2,435,021 $ 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 13 23  
Total loans [1] $ 1,130,435    
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 10 10  
Number Of Financing Receivables Total Past Due | loan 27 37  
Total $ 1,130,435 $ 1,097,626 $ 1,095,555 [1]
Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 1,392 1,640  
Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 217 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 1,937 529  
Home Equity Loan [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 3,546 3,407  
Home Equity Loan [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 1,126,889 $ 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] 421 413  
Total loans $ 36,572 $ 32,654  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan [2] 7 14  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan [2] 2 6  
Number Of Financing Receivables Total Past Due | loan [2] 430 433  
Total [2] $ 36,572 $ 32,654  
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans [2] 264 288  
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans [2] 24 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] 15 8  
Consumer - Other [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans [2] 303 327  
Consumer - Other [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans [2] $ 36,269 $ 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 September 30, 2024 and December 31, 2023, respectively. Net unamortized discounts on acquired loans included in the ending balance were $8.3 million and $8.6 million at September 30, 2024 and December 31, 2023, respectively.