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.