Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Unamortized premium (discount) on acquired loans	$ (19,300,000)			$ (24,000,000.0)
Total loans, net of deferred loan costs/(fees)	$ 8,069,848,000			8,150,102,000
Number of loans to debtors with nonperforming loans | loan	1
Interest income on nonaccrual loans	$ 0	$ 0
Non accrual individually evaluated loan threshold	500,000
Collateral dependent individually evaluated loan threshold	500,000
Allowance for credit losses on loans	110,058,000	109,230,000	$ 110,067,000	109,853,000	$ 106,396,000	$ 90,967,000
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of deferred loan costs/(fees)	6,600,000,000			6,500,000,000
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	3,329,000	2,688,000	3,113,000	2,992,000	3,295,000	2,900,000
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	$ 19,837,000	23,442,000	$ 20,294,000	21,227,000	$ 23,073,000	17,718,000
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage	88.00%
Officers and Directors
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of deferred loan costs/(fees)	$ 63,900,000			63,700,000
Number of new loans | loan	1
Financing receivable, excluding accrued interest, advances	$ 1,300,000
Repayments received from related parties	1,000,000.0
Officers and Directors | Unused lines of Credit
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, excluding accrued interest, available credit	1,300,000			2,700,000
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement	1,800,000			1,000,000
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	9,860,000	$ 13,018,000		11,369,000		$ 13,306,000
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized premium (discount) on acquired loans	$ (3,200,000)			$ (3,500,000)