Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023		Mar. 31, 2022		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 159,131,000	[1]	$ 144,518,000	[1]	$ 152,419,000	$ 146,922,000
Unfunded commitments	$ 1,600,000				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	$ 0
Additional commitments to lend to borrowers party to a TDR					64,000
TDRs modified during the prior twelve months subsequently defaulted	0		0
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 36,932,000	[1]	$ 14,169,000	[1]	$ 27,559,000	$ 14,402,000

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $52.7 million and $39.4 million as of March 31, 2023 and March 31, 2022, respectively.