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Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses $ 163,696 [1] $ 140,569 [1] $ 150,859 $ 142,222 $ 140,647 $ 152,419
Unfunded commitments $ 1,400     1,500    
Days to be termed as non accrual loans 90 days          
Financing Receivable, Nonaccrual [2] $ 104,248     54,383    
Financing receivable, net deferred costs 6,200     6,400    
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) 8,300     8,600    
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification 0 0        
Financing Receivable, Modified, Subsequent Default   6,700        
Financial Asset, Not Past Due | Aging Loan Modification Member            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans and Leases Receivable, Net of Deferred Income 58,262 23,801        
Commercial And Industrial [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses 15,937 [1] 16,934 [1] 20,884 19,243 15,142 27,559
Financing Receivable, Nonaccrual 12,027     20,188    
Commercial And Industrial [Member] | Financial Asset, Not Past Due | Aging Loan Modification Member            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans and Leases Receivable, Net of Deferred Income 10,467 7,409        
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses 99,622 [1] 74,402 [1] $ 80,501 74,148 $ 78,396 $ 77,799
Financing Receivable, Nonaccrual 77,951     $ 22,952    
Commercial Real Estate [Member] | Financial Asset, Not Past Due | Aging Loan Modification Member            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans and Leases Receivable, Net of Deferred Income $ 43,731 $ 16,252        
[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $55.3 million and $58.1 million as of September 30, 2024 and September 30, 2023, respectively.
[2]
(1)Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values, or reflect partially charged-off loans, with no risk of further loss.