Loans, Allowance for Credit Losses and Credit Quality Financing Receivable, Allowance for Credit Loss (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 147,313,000	[1]	$ 92,246,000	[1]	$ 147,313,000	[1]	$ 92,246,000	[1]	$ 144,319,000	$ 146,922,000	$ 102,357,000	$ 113,392,000
Allowance for Loan and Lease Losses, Write-offs	(741,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	735,000
Provision for Loan and Lease Losses	3,000,000
Provision for (release of) credit losses	3,000,000		(10,000,000)		1,000,000		(17,500,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			221,000		1,383,000		853,000
Allowance for Loan and Lease Losses, Write-offs			(332,000)		(1,992,000)		(4,499,000)
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	20,169,000	[1]	16,014,000	[1]	20,169,000	[1]	16,014,000	[1]	14,107,000	14,402,000	17,032,000	21,086,000
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	2,000
Provision for Loan and Lease Losses	6,060,000
Provision for (release of) credit losses			(1,018,000)		5,723,000		(1,698,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			1,000		44,000		100,000
Allowance for Loan and Lease Losses, Write-offs			(1,000)		0		(3,474,000)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	80,036,000	[1]	37,798,000	[1]	80,036,000	[1]	37,798,000	[1]	83,456,000	83,486,000	44,325,000	45,009,000
Allowance for Loan and Lease Losses, Write-offs	(62,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	330,000
Provision for Loan and Lease Losses	(3,688,000)
Provision for (release of) credit losses			(6,527,000)		(3,721,000)		(7,268,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			0		333,000		57,000
Allowance for Loan and Lease Losses, Write-offs			0		(62,000)		0
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	11,419,000	[1]	4,468,000	[1]	11,419,000	[1]	4,468,000	[1]	11,710,000	12,316,000	4,865,000	5,397,000
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0
Provision for Loan and Lease Losses	(291,000)
Provision for (release of) credit losses			(397,000)		(897,000)		(929,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			0		0		0
Allowance for Loan and Lease Losses, Write-offs			0		0		0
Small Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	2,624,000	[1]	3,667,000	[1]	2,624,000	[1]	3,667,000	[1]	2,784,000	3,508,000	3,612,000	5,095,000
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	88,000
Provision for Loan and Lease Losses	(248,000)
Provision for (release of) credit losses			88,000		(972,000)		(1,309,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			50,000		147,000		65,000
Allowance for Loan and Lease Losses, Write-offs			(83,000)		(59,000)		(184,000)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	20,602,000	[1]	11,047,000	[1]	20,602,000	[1]	11,047,000	[1]	19,750,000	14,484,000	12,014,000	14,275,000
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0
Provision for Loan and Lease Losses	852,000
Provision for (release of) credit losses			(967,000)		6,118,000		(3,229,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			0		0		1,000
Allowance for Loan and Lease Losses, Write-offs			0		0		0
Home Equity Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	11,651,000	[1]	18,868,000	[1]	11,651,000	[1]	18,868,000	[1]	11,740,000	17,986,000	20,087,000	22,060,000
Allowance for Loan and Lease Losses, Write-offs	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	65,000
Provision for Loan and Lease Losses	(154,000)
Provision for (release of) credit losses			(1,268,000)		(6,318,000)		(3,230,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts			49,000		105,000		107,000
Allowance for Loan and Lease Losses, Write-offs			0		(122,000)		(69,000)
Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	812,000	[1]	384,000	[1]	812,000	[1]	384,000	[1]	$ 772,000	$ 740,000	$ 422,000	$ 470,000
Allowance for Loan and Lease Losses, Write-offs	(679,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	251,000
Provision for Loan and Lease Losses	$ 469,000
Provision for (release of) credit losses			89,000		1,067,000		163,000
Allowance for Loan and Lease Loss, Recovery of Bad Debts			121,000		754,000		523,000
Allowance for Loan and Lease Losses, Write-offs			$ (248,000)		$ (1,749,000)		$ (772,000)

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $42.7 million and $36.7 million as of September 30, 2022 and September 30, 2021, respectively.