Loans, Allowance for Credit Losses and Credit Quality Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021		Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 144,319	[1]			$ 144,319	[1]			$ 144,518	$ 146,922	$ 107,549	$ 113,392
Allowance for Loan and Lease Losses, Write-offs		(544)
Allowance for Loan and Lease Loss, Recovery of Bad Debts		345
Provision for Loan and Lease Losses		0
Loans and Leases Receivable, Allowance		144,319	[1]	$ 102,357	[1]	144,319	[1]	$ 102,357	[1]		146,922
Release of provision for credit losses		0		(5,000)		(2,000)		(7,500)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				289		647		632
Allowance for Loan and Lease Losses, Write-offs				(481)		(1,250)		(4,167)
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		14,107	[1]			14,107	[1]			14,169	14,402	20,207	21,086
Allowance for Loan and Lease Losses, Write-offs		0
Allowance for Loan and Lease Loss, Recovery of Bad Debts		29
Provision for Loan and Lease Losses		(91)
Loans and Leases Receivable, Allowance	[1]	14,107		17,032		14,107		17,032
Release of provision for credit losses				(3,068)		(337)		(680)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				35		42		99
Allowance for Loan and Lease Losses, Write-offs				(142)		0		(3,473)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		83,456	[1]			83,456	[1]			84,436	83,486	44,348	45,009
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		(980)
Loans and Leases Receivable, Allowance	[1]	83,456		44,325		83,456		44,325
Release of provision for credit losses				(23)		(33)		(741)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				0		3		57
Allowance for Loan and Lease Losses, Write-offs				0		0		0
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		11,710	[1]			11,710	[1]			11,867	12,316	5,268	5,397
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		(157)
Loans and Leases Receivable, Allowance	[1]	11,710		4,865		11,710		4,865
Release of provision for credit losses				(403)		(606)		(532)
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		2,784	[1]			2,784	[1]			3,159	3,508	3,621	5,095
Allowance for Loan and Lease Losses, Write-offs		(11)
Allowance for Loan and Lease Loss, Recovery of Bad Debts		33
Provision for Loan and Lease Losses		(397)
Loans and Leases Receivable, Allowance	[1]	2,784		3,612		2,784		3,612
Release of provision for credit losses				22		(724)		(1,397)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				4		59		15
Allowance for Loan and Lease Losses, Write-offs				(35)		(59)		(101)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		19,750	[1]			19,750	[1]			18,388	14,484	12,956	14,275
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		1,362
Loans and Leases Receivable, Allowance	[1]	19,750		12,014		19,750		12,014
Release of provision for credit losses				(942)		5,266		(2,262)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				0		0		1
Allowance for Loan and Lease Losses, Write-offs				0		0		0
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		11,740	[1]			11,740	[1]			11,750	17,986	20,716	22,060
Allowance for Loan and Lease Losses, Write-offs		(98)
Allowance for Loan and Lease Loss, Recovery of Bad Debts		14
Provision for Loan and Lease Losses		74
Loans and Leases Receivable, Allowance	[1]	11,740		20,087		11,740		20,087
Release of provision for credit losses				(605)		(6,164)		(1,962)
Allowance for Loan and Lease Loss, Recovery of Bad Debts				45		40		58
Allowance for Loan and Lease Losses, Write-offs				(69)		(122)		(69)
Consumer - Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		772	[1]			772	[1]			$ 749	$ 740	$ 433	$ 470
Allowance for Loan and Lease Losses, Write-offs		(435)
Allowance for Loan and Lease Loss, Recovery of Bad Debts		269
Provision for Loan and Lease Losses		189
Loans and Leases Receivable, Allowance	[1]	$ 772		422		772		422
Release of provision for credit losses				19		598		74
Allowance for Loan and Lease Loss, Recovery of Bad Debts				205		503		402
Allowance for Loan and Lease Losses, Write-offs				$ (235)		$ (1,069)		$ (524)

[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $39.0 million and $29.9 million as of June 30, 2022 and June 30, 2021, respectively.