Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023		Dec. 31, 2022	Mar. 31, 2022
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		$ 586,214			$ 665,591
2020		2,790,090			2,892,632
2019		2,459,335			2,265,477
2018		1,759,576			1,265,677
2017		997,571			1,207,151
Prior		3,595,331			3,612,192
Revolving Loans		1,758,898			1,669,266
Revolving converted to Term		937			2,041
Total loans		13,947,952	[1]	$ 13,928,675
Total loans		13,947,952		13,928,675	13,580,027
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		498
2022		0
2021		0
2020		0
2019		0
Prior		34
Revolving Loans		283
Revolving converted to Term		0
Total		815
Commercial And Industrial [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		153,554			139,674
2020		269,940			290,515
2019		124,991			160,453
2018		95,734			86,977
2017		56,910			106,159
Prior		86,734			33,879
Revolving Loans		862,019			748,535
Revolving converted to Term		0			0
Total loans		1,649,882	[1]	1,635,103
Total loans		1,649,882		1,635,103	1,566,192	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		34
Revolving Loans		247
Revolving converted to Term		0
Total		281
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021	[2]	153,554			138,642
2020	[2]	262,933			288,516
2019	[2]	122,770			159,051
2018	[2]	94,702			85,497
2017	[2]	54,925			105,651
Prior	[2]	85,391			30,082
Revolving Loans	[2]	811,795			741,200
Revolving converted to Term	[2]	0			0
Total loans	[1],[2]	1,586,070
Total loans	[1],[2]				1,548,639
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021					629
2020		4,712			746
2019		705			1,402
2018		868			1,423
2017		1,608			88
Prior		1,342			1,113
Revolving Loans		24,114			4,097
Revolving converted to Term		0			0
Total loans	[1]	33,349
Total loans	[1]				9,498
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021					403
2020		2,295			1,253
2019		1,516
2018		164			57
2017		377			420
Prior		1			2,684
Revolving Loans		2,936			3,238
Revolving converted to Term		0			0
Total loans	[1]	7,289
Total loans	[1]				8,055
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		23,174			0
Revolving converted to Term		0			0
Total loans	[1]	23,174
Total loans	[1]				0
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Commercial Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		208,097			237,111
2020		1,291,497			1,619,466
2019		1,539,931			1,351,525
2018		1,294,456			914,777
2017		737,385			913,755
Prior		2,688,918			2,710,861
Revolving Loans		59,810			149,599
Revolving converted to Term		0			522
Total loans		7,820,094	[1]	7,760,230
Total loans		7,820,094		7,760,230	7,897,616	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		0
Revolving converted to Term		0
Total		0
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		204,462			226,907
2020		1,199,328			1,548,212
2019		1,459,526			1,254,460
2018		1,259,511			867,980
2017		720,208			830,148
Prior		2,439,424			2,431,434
Revolving Loans		59,810			135,980
Revolving converted to Term		0			522
Total loans	[1]	7,342,269
Total loans	[1]				7,295,643
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		154			10,059
2020		52,961			51,223
2019		67,200			92,984
2018		29,611			43,560
2017		13,139			83,195
Prior		225,673			210,418
Revolving Loans		0			13,619
Revolving converted to Term		0			0
Total loans	[1]	388,738
Total loans	[1]				505,058
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		3,481			145
2020		39,208			20,031
2019		13,205			4,081
2018		5,334			3,237
2017		4,038			412
Prior		23,821			69,009
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	89,087
Total loans	[1]				96,915
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Construction Loans [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		116,412			82,805
2020		473,258			415,492
2019		274,777			443,134
2018		93,838			100,066
2017		62,033			30,145
Prior		4,755			47,887
Revolving Loans		21,237			34,416
Total loans		1,046,310	[1]	1,154,413
Total loans		1,046,310		1,154,413	1,153,945	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		0
Revolving converted to Term		0
Total		0
Construction Loans [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		90,362			82,805
2020		461,824			400,932
2019		266,758			440,129
2018		89,919			100,066
2017		62,033			30,145
Prior		4,755			34,952
Revolving Loans		21,237			34,416
Revolving converted to Term		0
Total loans	[1]	996,888
Total loans	[1]				1,123,445
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		18,431			0
2020		0
2019		5,889			3,005
2018		3,919			0
2017		0			0
Prior		0			12,935
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	28,239
Total loans	[1]				15,940
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		7,619			0
2020		11,434			14,560
2019		2,130			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	21,183
Total loans	[1]				14,560
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Small Business [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		9,875			14,959
2020		54,384			52,220
2019		43,571			37,009
2018		30,272			19,936
2017		16,176			12,339
Prior		27,450			25,009
Revolving Loans		44,138			38,933
Revolving converted to Term		0			0
Total loans		225,866	[1]	219,102
Total loans		225,866		219,102	200,405	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		28
Revolving converted to Term		0
Total		28
Small Business [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		9,770			14,959
2020		54,258			52,037
2019		43,458			35,973
2018		29,810			19,540
2017		16,173			12,136
Prior		26,536			24,449
Revolving Loans		42,746			37,719
Revolving converted to Term		0			0
Total loans	[1]	222,751
Total loans	[1]				196,813
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			183
2019					435
2018		158			376
2017					196
Prior		228			277
Revolving Loans		527			761
Revolving converted to Term		0			0
Total loans	[1]	913
Total loans	[1]				2,228
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		105			0
2020		126
2019		113			601
2018		304			20
2017		3			7
Prior		686			283
Revolving Loans		865			453
Revolving converted to Term		0			0
Total loans	[1]	2,202
Total loans	[1]				1,364
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			0
2017		0			0
Prior		0			0
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	0
Total loans	[1]				0
Residential Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		91,404			177,524
2020		658,273			446,985
2019		416,067			209,685
2018		190,785			106,746
2017		93,084			112,600
Prior		646,031			652,505
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans		2,095,644	[1]	2,035,524
Total loans		2,095,644		2,035,524	1,706,045	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		0
Revolving converted to Term		0
Total		0
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		91,404			177,524
2020		658,273			446,985
2019		416,067			209,293
2018		190,313			106,746
2017		92,927			111,601
Prior		644,659			650,555
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	2,093,643
Total loans	[1]				1,702,704
Residential Real Estate [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			392
2018		472
2017		157			999
Prior		1,372			1,950
Revolving Loans		0			0
Revolving converted to Term		0			0
Total loans	[1]	2,001
Total loans	[1]				3,341
Home Equity Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		6,812			13,376
2020		42,352			64,981
2019		58,830			61,198
2018		53,565			35,197
2017		31,463			31,458
Prior		139,554			137,379
Revolving Loans		757,242			680,707
Revolving converted to Term		937			1,519
Total loans	[1]	1,090,755
Total loans		1,090,755		$ 1,088,750	1,025,815	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		0
Revolving converted to Term		0
Total		0
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		6,812			13,376
2020		42,352			64,981
2019		58,830			61,198
2018		53,565			35,075
2017		31,341			31,458
Prior		139,472			137,315
Revolving Loans		756,103			678,867
Revolving converted to Term		937			1,519
Total loans	[1]	1,089,412
Total loans	[1]				1,023,789
Home Equity Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			0
2019		0			0
2018		0			122
2017		122			0
Prior		82			64
Revolving Loans		1,139			1,840
Revolving converted to Term		0			0
Total loans	[1]	1,343
Total loans	[1]				2,026
Consumer Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		60			142
2020		386			2,973
2019		1,168			2,473
2018		926			1,978
2017		520			695
Prior		1,889			4,672
Revolving Loans		14,452			17,076
Revolving converted to Term		0			0
Total loans	[1]	19,401
Total loans	[1]				30,009
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023		498
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans		8
Revolving converted to Term		0
Total		506
Consumer Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		60			142
2020		386			2,964
2019		1,168			2,469
2018		926			1,978
2017		514			695
Prior		1,852			4,669
Revolving Loans		14,450			17,074
Revolving converted to Term		0			0
Total loans	[1]	19,356
Total loans	[1]				29,991
Consumer Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0			0
2020		0			9
2019		0			4
2018		0			0
2017		6			0
Prior		37			3
Revolving Loans		2			2
Revolving converted to Term		0			0
Total loans	[1]	45
Total loans	[1]				18
Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans		$ 6,600			$ 99,600

[1] Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.

[2] Loans originated as part of the Paycheck Protection Program ("PPP") established by the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act")t are included within commercial and industrial under the 2021 and 2020 vintage year and "pass" category as these loans are 100% guaranteed by the U.S. Government. Outstanding PPP loans totaled $6.6 million and $99.6 million as of March 31, 2023 and 2022, respectively. (3)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.