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Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 190,476 | [1] | $ 144,773 | $ 169,984 | $ 163,696 | [1] | $ 150,859 | $ 142,222
Unfunded commitments |  | $ 1,700 |  |  |  |  |  |  |
Days to be termed as non accrual loans |  | 90 days |  |  |  |  |  |  |
Financing Receivable, Nonaccrual | [2] | $ 86,597 |  |  | 101,529 |  |  |  |
Financing receivable, net deferred costs |  | 7,200 |  |  | 6,100 |  |  |  |
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) |  | 163,100 |  |  | 8,100 |  |  |  |
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification |  | 2,500 |  |  |  | 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  | (20,500) |  |  |  |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | 54,482 | [1] | 38,451 | 30,799 | 32,205 | [1] | 38,393 | 36,049
Financing Receivable, Nonaccrual |  | 23,173 |  |  | 14,454 |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | 77,083 | [1] | $ 60,927 | 93,718 | $ 87,459 | [1] | $ 67,051 | $ 61,305
Financing Receivable, Nonaccrual |  | $ 29,216 |  |  | $ 74,343 |  |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $70.8 million and $55.3 million as of September 30, 2025 and September 30, 2024, respectively.
[2] | (1)Non-accrual 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.

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