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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.

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