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Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | [1] | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses |  | $ 146,948,000 | [1] | $ 142,222,000 | $ 159,131,000 | $ 152,419,000
Unfunded commitments |  | $ 1,500,000 |  | 1,300,000 |  |
Days to be termed as non accrual loans |  | 90 days |  |  |  |
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification |  | $ 640,000 |  |  |  |
Financing Receivable, Nonaccrual | [2] | 56,941,000 |  | 54,383,000 |  |
Financing receivable, net deferred costs |  | 5,700,000 |  | 6,400,000 |  |
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) |  | 8,500,000 |  | 8,600,000 |  |
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 |  | 49,932,000 |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses |  | 20,489,000 | [1] | 19,243,000 | 36,932,000 | 27,559,000
Financing Receivable, Nonaccrual |  | 17,640,000 |  | 20,188,000 |  |
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 |  | 11,963,000 |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses |  | 77,929,000 | [1] | 74,148,000 | $ 76,198,000 | $ 77,799,000
Financing Receivable, Nonaccrual |  | 24,213,000 |  | $ 22,952,000 |  |
TDRs modified during the prior twelve months subsequently defaulted |  | 136,000 |  |  |  |
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 |  | $ 27,094,000 |  |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $59.3 million and $52.7 million as of March 31, 2024 and March 31, 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.

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