Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2026		Jun. 30, 2025		Jun. 30, 2026		Jun. 30, 2025		Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		$ 195,899	[1]	$ 144,773	[1]	$ 195,899	[1]	$ 144,773	[1]	$ 190,560	$ 189,877	$ 144,092	$ 169,984
Unfunded commitments		1,900				$ 1,900					1,800
Days to be termed as non accrual loans						90 days
Financing Receivable, Nonaccrual	[2]	103,642				$ 103,642					83,557
Financing receivable, net deferred costs		9,600				9,600					7,700
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount)		143,500				143,500					157,000
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification		1,900				1,900					14,600
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)						(6,000)
Provision for Loan and Lease Losses		6,250		7,200		11,750		22,200
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery						5,700
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		56,880	[1]	38,451	[1]	56,880	[1]	38,451	[1]	49,282	47,976	37,219	30,799
Financing Receivable, Nonaccrual		9,204				9,204					9,160
Provision for Loan and Lease Losses		8,062		4,025		9,679		10,597
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		78,879	[1]	60,927	[1]	78,879	[1]	60,927	[1]	$ 82,992	84,916	$ 61,416	$ 93,718
Financing Receivable, Nonaccrual		64,544				64,544					$ 50,515
Provision for Loan and Lease Losses		$ (4,055)		$ 2,858		$ (1,945)		$ 10,552

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $68.3 million and $54.5 million as of June 30, 2026 and June 30, 2025, 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.