Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025		Dec. 31, 2024	Mar. 31, 2024		Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		$ 144,092	[1]	$ 169,984	$ 146,948	[1]	$ 142,222
Unfunded commitments		$ 1,400
Days to be termed as non accrual loans		90 days
Financing Receivable, Nonaccrual	[2]	$ 89,493		101,529
Financing receivable, net deferred costs		6,000		6,100
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount)		7,700		8,100
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification		0			640
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)		25,900
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		34,200	[1]	27,800	35,175	[1]	33,317
Financing Receivable, Nonaccrual		9,683		14,152
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		60,117	[1]	92,535	$ 63,243	[1]	$ 60,074
Financing Receivable, Nonaccrual		$ 65,840		$ 74,343

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $53.7 million and $59.3 million as of March 31, 2025 and March 31, 2024, 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.