Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2025		Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024		Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		$ 144,773	[1]	$ 144,092	$ 169,984	$ 150,859	[1]	$ 146,948	$ 142,222
Unfunded commitments		$ 1,400
Days to be termed as non accrual loans		90 days
Financing Receivable, Nonaccrual	[2]	$ 56,217			101,529
Financing receivable, net deferred costs		6,800			6,100
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount)		7,500			8,100
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification		4,600				275
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)		25,200
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		35,309	[1]	34,200	27,800	35,620	[1]	35,175	33,317
Financing Receivable, Nonaccrual		13,544			14,152
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		59,504	[1]	$ 60,117	92,535	$ 65,765	[1]	$ 63,243	$ 60,074
Financing Receivable, Nonaccrual		$ 28,717			$ 74,343

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $54.5 million and $59.2 million as of June 30, 2025 and June 30, 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.