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Loans, Allowance for Credit Losses and Credit Quality - Financing Receivable Past Due (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
loan
Mar. 31, 2023
USD ($)
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 482 480  
Total loans $ 14,330,594 [1] $ 14,278,070  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 28 29  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 39 40  
Number Of Financing Receivables Total Past Due | loan 549 549  
Total $ 14,330,594 $ 14,278,070 $ 13,947,952
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 27,803 23,616  
Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 774 29,433  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 45,959 10,305  
Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 74,536 63,354  
Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 14,256,058 $ 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 8 6  
Total loans $ 1,580,041 [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 2 2  
Number Of Financing Receivables Total Past Due | loan 12 9  
Total $ 1,580,041 $ 1,579,986 1,649,882 [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 743 398  
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 85 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 17,555 673  
Commercial And Industrial [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 18,383 18,609  
Commercial And Industrial [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 1,561,658 $ 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 10 8  
Total loans $ 8,108,836 [1] $ 8,041,508  
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 5 3  
Number Of Financing Receivables Total Past Due | loan 15 13  
Total $ 8,108,836 $ 8,041,508 7,820,094 [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 20,582 14,674  
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 0 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 24,056 7,279  
Commercial Real Estate [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 44,638 30,372  
Commercial Real Estate [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 8,064,198 $ 8,011,136  
Construction Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 1 0  
Total loans $ 828,900 [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 1 0  
Total $ 828,900 $ 849,586 1,046,310 [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 1,019 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 1,019 0  
Construction Loans [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 827,881 $ 849,586  
Small Business [Member]      
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 17 6  
Total loans $ 261,690 [1] $ 251,956  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 6 1  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 1 6  
Number Of Financing Receivables Total Past Due | loan 24 13  
Total $ 261,690 $ 251,956 225,866 [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 539 400  
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 321 20  
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 5 243  
Small Business [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 865 663  
Small Business [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 260,825 $ 251,293  
Residential Real Estate [Member]      
Financing Receivable, Past Due [Line Items]      
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan 14 24  
Total loans $ 2,420,705 [1] $ 2,424,754  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 3 7  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 16 13  
Number Of Financing Receivables Total Past Due | loan 33 44  
Total $ 2,420,705 $ 2,424,754 2,095,644 [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 3,482 6,216  
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 248 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 2,641 1,573  
Residential Real Estate [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 6,371 9,976  
Residential Real Estate [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 2,414,334 $ 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 17 23  
Total loans [1] $ 1,100,586    
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan 3 4  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan 15 10  
Number Of Financing Receivables Total Past Due | loan 35 37  
Total $ 1,100,586 $ 1,097,626 $ 1,090,755 [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 1,200 1,640  
Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans 89 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 1,702 529  
Home Equity Loan [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 2,991 3,407  
Home Equity Loan [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans $ 1,097,595 $ 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] 415 413  
Total loans $ 29,836 $ 32,654  
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan [2] 14 14  
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan [2] 0 6  
Number Of Financing Receivables Total Past Due | loan [2] 429 433  
Total [2] $ 29,836 $ 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] 238 288  
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total loans [2] 31 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] 0 8  
Consumer - Other [Member] | Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans [2] 269 327  
Consumer - Other [Member] | Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans [2] $ 29,567 $ 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 $5.7 million and $6.4 million at March 31, 2024 and December 31, 2023, respectively. Net unamortized discounts on acquired loans included in the ending balance was $8.5 million and $8.6 million at March 31, 2024 and December 31, 2023, respectively.