Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023		Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		$ 524,105		$ 586,214
2021		2,202,825		2,790,090
2020		2,482,942		2,459,335
2019		2,072,585		1,759,576
2018		1,595,566		997,571
Prior		3,732,923		3,595,331
Revolving Loans		1,714,753		1,758,898
Revolving converted to Term		4,895		937
Total loans		14,330,594	[1]			$ 14,278,070
Total loans		14,330,594		13,947,952		14,278,070
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		763		498
2023		0		0
2022		28		0
2021		0		0
2020		0		0
Prior		0		34
Revolving Loans		90		283
Revolving converted to Term		0		0
Total		881		815
Commercial And Industrial [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		164,051		153,554
2021		226,555		269,940
2020		150,188		124,991
2019		73,532		95,734
2018		70,071		56,910
Prior		150,562		86,734
Revolving Loans		745,082		862,019
Revolving converted to Term		0		0
Total loans		1,580,041	[1]			1,579,986
Total loans		1,580,041		1,649,882	[1]	1,579,986
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		34
Revolving Loans		0		247
Revolving converted to Term		0		0
Total		0		281
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022	[2]	159,082		153,554
2021	[2]	223,301		262,933
2020	[2]	148,288		122,770
2019	[2]	73,012		94,702
2018	[2]	60,865		54,925
Prior	[2]	146,495		85,391
Revolving Loans	[2]	685,258		811,795
Revolving converted to Term	[2]	0		0
Total loans	[1],[2]	1,496,301
Total loans	[1],[2]			1,586,070
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		3,160
2021		3,254		4,712
2020		1,843		705
2019		322		868
2018		9,206		1,608
Prior		4,024		1,342
Revolving Loans		31,525		24,114
Revolving converted to Term		0		0
Total loans	[1]	53,334
Total loans	[1]			33,349
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		1,809
2021				2,295
2020		57		1,516
2019		198		164
2018		0		377
Prior		43		1
Revolving Loans		28,299		2,936
Revolving converted to Term		0		0
Total loans	[1]	30,406
Total loans	[1]			7,289
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		0		0
Prior		0		0
Revolving Loans		0		23,174
Revolving converted to Term		0		0
Total loans	[1]	0
Total loans	[1]			23,174
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		199,502		208,097
2021		1,216,718		1,291,497
2020		1,257,680		1,539,931
2019		1,381,462		1,294,456
2018		1,260,901		737,385
Prior		2,698,980		2,688,918
Revolving Loans		93,345		59,810
Revolving converted to Term		248		0
Total loans		8,108,836	[1]			8,041,508
Total loans		8,108,836		7,820,094	[1]	8,041,508
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total		0		0
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		193,152		204,462
2021		1,127,417		1,199,328
2020		1,201,044		1,459,526
2019		1,304,867		1,259,511
2018		1,212,201		720,208
Prior		2,562,542		2,439,424
Revolving Loans		93,048		59,810
Revolving converted to Term		248		0
Total loans	[1]	7,694,519
Total loans	[1]			7,342,269
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022				154
2021		61,943		52,961
2020		38,590		67,200
2019		53,837		29,611
2018		44,806		13,139
Prior		124,614		225,673
Revolving Loans		297		0
Revolving converted to Term		0		0
Total loans	[1]	324,087
Total loans	[1]			388,738
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		6,350		3,481
2021		27,358		39,208
2020		18,046		13,205
2019		22,758		5,334
2018		3,894		4,038
Prior		3,973		23,821
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	82,379
Total loans	[1]			89,087
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		0		0
Prior		7,851		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	7,851
Total loans	[1]			0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		111,469		116,412
2021		183,508		473,258
2020		355,369		274,777
2019		125,325		93,838
2018		7,971		62,033
Prior		25,184		4,755
Revolving Loans		19,398		21,237
Revolving converted to Term		676
Total loans		828,900	[1]			849,586
Total loans		828,900		1,046,310	[1]	849,586
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total		0		0
Construction Loans [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		97,558		90,362
2021		164,784		461,824
2020		336,768		266,758
2019		100,371		89,919
2018		7,971		62,033
Prior		25,184		4,755
Revolving Loans		19,398		21,237
Revolving converted to Term		676
Total loans	[1]	752,710
Total loans	[1]			996,888
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		3,326		18,431
2021		18,724		0
2020		0		5,889
2019		5,618		3,919
2018		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	27,668
Total loans	[1]			28,239
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		10,585		7,619
2021		0		11,434
2020		18,601		2,130
2019		19,336		0
2018		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	48,522
Total loans	[1]			21,183
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		14,887		9,875
2021		50,464		54,384
2020		49,109		43,571
2019		37,844		30,272
2018		24,151		16,176
Prior		34,086		27,450
Revolving Loans		51,149		44,138
Revolving converted to Term		0		0
Total loans		261,690	[1]			251,956
Total loans		261,690		225,866	[1]	251,956
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		28		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		81		28
Revolving converted to Term		0		0
Total		109		28
Small Business [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		14,707		9,770
2021		49,885		54,258
2020		48,880		43,458
2019		37,682		29,810
2018		23,538		16,173
Prior		33,246		26,536
Revolving Loans		49,943		42,746
Revolving converted to Term		0		0
Total loans	[1]	257,881
Total loans	[1]			222,751
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		59		0
2020		5
2019		75		158
2018		152
Prior		182		228
Revolving Loans		481		527
Revolving converted to Term		0		0
Total loans	[1]	954
Total loans	[1]			913
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		180		105
2021		520		126
2020		224		113
2019		87		304
2018		461		3
Prior		658		686
Revolving Loans		725		865
Revolving converted to Term		0		0
Total loans	[1]	2,855
Total loans	[1]			2,202
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		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]
2022		29,922		91,404
2021		497,477		658,273
2020		633,135		416,067
2019		399,440		190,785
2018		183,544		93,084
Prior		677,187		646,031
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans		2,420,705	[1]			2,424,754
Total loans		2,420,705		2,095,644	[1]	2,424,754
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total		0		0
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		29,922		91,404
2021		497,477		658,273
2020		633,135		416,067
2019		399,440		190,313
2018		183,544		92,927
Prior		674,298		644,659
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	2,417,816
Total loans	[1]			2,093,643
Residential Real Estate [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		472
2018		0		157
Prior		2,889		1,372
Revolving Loans		0		0
Revolving converted to Term		0		0
Total loans	[1]	2,889
Total loans	[1]			2,001
Home Equity Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		4,208		6,812
2021		27,517		42,352
2020		37,245		58,830
2019		54,001		53,565
2018		48,389		31,463
Prior		145,199		139,554
Revolving Loans		780,056		757,242
Revolving converted to Term		3,971		937
Total loans	[1]	1,100,586
Total loans		1,100,586		1,090,755	[1]	$ 1,097,626
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		0		0
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		0		0
Revolving converted to Term		0		0
Total		0		0
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		4,208		6,812
2021		27,517		42,352
2020		37,162		58,830
2019		54,001		53,565
2018		48,389		31,341
Prior		145,029		139,472
Revolving Loans		778,842		756,103
Revolving converted to Term		3,736		937
Total loans	[1]	1,098,884
Total loans	[1]			1,089,412
Home Equity Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		83		0
2019		0		0
2018		0		122
Prior		170		82
Revolving Loans		1,214		1,139
Revolving converted to Term		235		0
Total loans	[1]	1,702
Total loans	[1]			1,343
Consumer Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		66		60
2021		586		386
2020		216		1,168
2019		981		926
2018		539		520
Prior		1,725		1,889
Revolving Loans		25,723		14,452
Revolving converted to Term		0		0
Total loans	[1]	29,836
Total loans	[1]			19,401
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2024		763		498
2023		0		0
2022		0		0
2021		0		0
2020		0		0
Prior		0		0
Revolving Loans		9		8
Revolving converted to Term		0		0
Total		772		506
Consumer Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		66		60
2021		586		386
2020		216		1,168
2019		981		926
2018		539		514
Prior		1,725		1,852
Revolving Loans		25,723		14,450
Revolving converted to Term		0		0
Total loans	[1]	29,836
Total loans	[1]			19,356
Consumer Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2022		0		0
2021		0		0
2020		0		0
2019		0		0
2018		0		6
Prior		0		37
Revolving Loans		0		2
Revolving converted to Term		0		0
Total loans	[1]	$ 0
Total loans	[1]			$ 45

[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] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.