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Loans, Allowance for Credit Losses and Credit Quality - Financing Receivable, Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 150,859 $ 140,647 $ 142,222 $ 152,419
Allowance for Loan and Lease Losses, Write-offs (7,006) (6,018) (8,695) (30,600)
Recoveries   440 1,419 1,000
Provision for credit losses 19,500 5,500 28,750 17,750
Ending balance [1] 163,696 140,569 163,696 140,569
Allowance for Loan and Lease Loss, Recovery of Bad Debts 343      
Provision for Loan and Lease Losses 19,500      
Accounts Receivable, Noncurrent, Accrued Interest, Writeoff 95 62 594 487
Commercial And Industrial [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 20,884 15,142 19,243 27,559
Allowance for Loan and Lease Losses, Write-offs (5,886) 0 (5,886) (23,471)
Recoveries   111 90 132
Provision for credit losses   1,681 2,490 12,714
Ending balance [1] 15,937 16,934 15,937 16,934
Allowance for Loan and Lease Loss, Recovery of Bad Debts 3      
Provision for Loan and Lease Losses 936      
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 80,501 78,396 74,148 77,799
Allowance for Loan and Lease Losses, Write-offs 0 (5,072) 0 (5,072)
Recoveries   0 0 0
Provision for credit losses   1,078 25,474 1,675
Ending balance [1] 99,622 74,402 99,622 74,402
Allowance for Loan and Lease Loss, Recovery of Bad Debts 0      
Provision for Loan and Lease Losses 19,121      
Construction Loans [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 7,804 9,038 7,683 10,762
Allowance for Loan and Lease Losses, Write-offs 0 0 0 0
Recoveries   0 0 0
Provision for credit losses   (208) (157) (1,932)
Ending balance [1] 7,526 8,830 7,526 8,830
Allowance for Loan and Lease Loss, Recovery of Bad Debts 0      
Provision for Loan and Lease Losses (278)      
Small Business [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 4,059 3,606 3,963 2,834
Allowance for Loan and Lease Losses, Write-offs (163) (112) (332) (199)
Recoveries   35 54 74
Provision for credit losses   385 420 1,205
Ending balance [1] 4,105 3,914 4,105 3,914
Allowance for Loan and Lease Loss, Recovery of Bad Debts 3      
Provision for Loan and Lease Losses 206      
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 24,836 21,465 23,637 20,973
Allowance for Loan and Lease Losses, Write-offs 0 0 0 0
Recoveries   0 0 0
Provision for credit losses   1,682 866 2,174
Ending balance [1] 24,503 23,147 24,503 23,147
Allowance for Loan and Lease Loss, Recovery of Bad Debts 0      
Provision for Loan and Lease Losses (333)      
Home Equity Loan [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 11,755 12,433 12,797 11,504
Allowance for Loan and Lease Losses, Write-offs (38) 0 (49) 0
Recoveries   12 295 38
Provision for credit losses   101 (1,882) 1,004
Ending balance [1] 11,161 12,546 11,161 12,546
Allowance for Loan and Lease Loss, Recovery of Bad Debts 14      
Provision for Loan and Lease Losses (570)      
Consumer - Other [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1,020 567 751 988
Allowance for Loan and Lease Losses, Write-offs (919) (834) (2,428) (1,858)
Recoveries   282 980 756
Provision for credit losses   781 1,539 910
Ending balance [1] 842 $ 796 $ 842 $ 796
Allowance for Loan and Lease Loss, Recovery of Bad Debts 323      
Provision for Loan and Lease Losses $ 418      
[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.