Loans and Allowance for Credit Losses - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	$ 392,675		$ 1,685,825
2023	1,644,768		3,116,426
2022	3,081,427		2,223,220
2021	2,157,984		1,459,559
2020	1,437,700		921,574
Prior	3,639,444		2,846,088
Revolving Loans	1,694,827		1,674,790
Revolving Loans Converted to Term Loans	6,975		20,878
Total	14,055,800		13,948,360
Current period gross charge-offs
Total	8,015	$ 911
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	153,385		482,901
2023	445,087		480,687
2022	445,061		367,551
2021	358,654		355,211
2020	347,581		140,730
Prior	762,932		644,484
Revolving Loans	557,538		544,357
Revolving Loans Converted to Term Loans	502		3,710
Total	3,070,740		3,019,631
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0
Commercial and industrial | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	143,899		477,138
2023	421,800		442,896
2022	406,278		350,782
2021	316,717		341,243
2020	332,314		140,641
Prior	754,805		641,342
Revolving Loans	499,682		485,448
Revolving Loans Converted to Term Loans	502		3,255
Total	2,875,997		2,882,745
Commercial and industrial | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	9,486		4,229
2023	4,904		25,796
2022	27,196		14,994
2021	40,184		13,563
2020	14,880		89
Prior	5,528		553
Revolving Loans	36,145		51,106
Revolving Loans Converted to Term Loans	0		455
Total	138,323		110,785
Commercial and industrial | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		1,534
2023	18,383		11,995
2022	11,587		1,775
2021	1,753		405
2020	387		0
Prior	2,591		2,581
Revolving Loans	21,711		7,803
Revolving Loans Converted to Term Loans	0		0
Total	56,412		26,093
Commercial and industrial | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		0
2023	0		0
2022	0		0
2021	0		0
2020	0		0
Prior	8		8
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	8		8
Commercial and industrial | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Commercial real estate | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	132,143		544,143
2023	573,762		1,456,472
2022	1,444,951		870,251
2021	871,226		578,044
2020	572,462		552,383
Prior	1,873,813		1,394,411
Revolving Loans	48,023		55,587
Revolving Loans Converted to Term Loans	0		2,556
Total	5,516,380		5,453,847
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	7,250
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	7,250	0
Commercial real estate | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	123,767		498,590
2023	477,412		1,435,893
2022	1,424,456		855,014
2021	840,761		573,370
2020	558,826		516,689
Prior	1,739,173		1,291,189
Revolving Loans	37,588		47,581
Revolving Loans Converted to Term Loans	0		2,556
Total	5,201,983		5,220,882
Commercial real estate | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		15,200
2023	66,182		7,990
2022	7,958		0
2021	23,728		736
2020	11,311		2,281
Prior	24,482		34,803
Revolving Loans	2,432		0
Revolving Loans Converted to Term Loans	0		0
Total	136,093		61,010
Commercial real estate | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	8,376		19,738
2023	19,662		12,589
2022	12,537		15,237
2021	6,737		3,938
2020	2,325		33,413
Prior	83,352		48,978
Revolving Loans	8,003		8,006
Revolving Loans Converted to Term Loans	0		0
Total	140,992		141,899
Commercial real estate | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		10,615
2023	10,506		0
2022	0		0
2021	0		0
2020	0		0
Prior	26,806		19,441
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	37,312		30,056
Commercial real estate | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Commercial construction | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	13,845		133,919
2023	135,561		151,957
2022	182,718		96,147
2021	54,108		0
2020	0		0
Prior	0		0
Revolving Loans	0		2,614
Revolving Loans Converted to Term Loans	0		0
Total	386,232		384,637
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0
Commercial construction | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	13,845		133,463
2023	135,106		151,957
2022	182,718		96,147
2021	54,108		0
2020	0		0
Prior	0		0
Revolving Loans	0		2,614
Revolving Loans Converted to Term Loans	0		0
Total	385,777		384,181
Commercial construction | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		456
2023	455		0
2022	0		0
2021	0		0
2020	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	455		456
Commercial construction | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Commercial construction | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Commercial construction | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Business banking | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	50,819		142,021
2023	132,678		168,396
2022	165,030		186,299
2021	181,430		152,545
2020	149,437		117,301
Prior	343,273		244,758
Revolving Loans	78,322		73,671
Revolving Loans Converted to Term Loans	2,895		4,602
Total	1,103,884		1,089,593
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	2
2020	0
Prior	100
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	102	343
Business banking | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	49,239		139,237
2023	131,526		165,247
2022	161,887		182,606
2021	175,923		146,180
2020	143,842		110,638
Prior	321,838		229,636
Revolving Loans	78,227		73,054
Revolving Loans Converted to Term Loans	2,325		3,996
Total	1,064,807		1,050,594
Business banking | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	1,449		1,474
2023	653		2,553
2022	2,563		1,009
2021	2,795		4,294
2020	3,509		4,692
Prior	16,775		11,479
Revolving Loans	74		23
Revolving Loans Converted to Term Loans	0		27
Total	27,818		25,551
Business banking | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		1,310
2023	499		596
2022	580		2,684
2021	2,712		2,071
2020	2,086		1,464
Prior	4,633		3,423
Revolving Loans	21		594
Revolving Loans Converted to Term Loans	570		579
Total	11,101		12,721
Business banking | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	131		0
2023	0		0
2022	0		0
2021	0		0
2020	0		507
Prior	27		220
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	158		727
Business banking | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Residential real estate | Residential Real Estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	18,971		258,421
2023	253,809		737,367
2022	727,932		669,681
2021	661,479		356,406
2020	352,211		95,601
Prior	545,839		464,989
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	2,560,241		2,582,465
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	10
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	10	0
Residential real estate | Residential Real Estate | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	18,971		257,671
2023	252,943		728,997
2022	723,437		665,811
2021	658,347		354,003
2020	349,251		93,817
Prior	534,416		451,812
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	2,537,365		2,552,111
Residential real estate | Residential Real Estate | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		750
2023	762		6,615
2022	2,947		2,437
2021	2,965		2,112
2020	2,790		1,496
Prior	6,715		8,219
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	16,179		21,629
Residential real estate | Residential Real Estate | Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Residential real estate | Residential Real Estate | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		0
2023	104		1,755
2022	1,548		1,433
2021	167		291
2020	170		288
Prior	4,708		4,958
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	6,697		8,725
Consumer home equity | Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	2,112		30,541
2023	28,609		84,614
2022	81,666		9,151
2021	8,879		4,899
2020	4,725		4,166
Prior	91,330		82,711
Revolving Loans	999,063		985,161
Revolving Loans Converted to Term Loans	3,538		9,925
Total	1,219,922		1,211,168
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	2
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	2	7
Consumer home equity | Consumer Portfolio Segment | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	2,112		30,393
2023	28,609		84,065
2022	81,312		9,151
2021	8,879		4,899
2020	4,725		4,166
Prior	88,814		80,687
Revolving Loans	987,234		970,882
Revolving Loans Converted to Term Loans	3,431		9,472
Total	1,205,116		1,193,715
Consumer home equity | Consumer Portfolio Segment | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		148
2023	0		483
2022	236		0
2021	0		0
2020	0		0
Prior	847		558
Revolving Loans	4,418		7,509
Revolving Loans Converted to Term Loans	37		223
Total	5,538		8,921
Consumer home equity | Consumer Portfolio Segment | Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Consumer home equity | Consumer Portfolio Segment | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		0
2023	0		66
2022	118		0
2021	0		0
2020	0		0
Prior	1,669		1,466
Revolving Loans	7,411		6,770
Revolving Loans Converted to Term Loans	70		230
Total	9,268		8,532
Other Consumer | Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	21,400		93,879
2023	75,262		36,933
2022	34,069		24,140
2021	22,208		12,454
2020	11,284		11,393
Prior	22,257		14,735
Revolving Loans	11,881		13,400
Revolving Loans Converted to Term Loans	40		85
Total	198,401		207,019
Current period gross charge-offs
2024	280
2023	74
2022	125
2021	105
2020	14
Prior	37
Revolving Loans	16
Revolving Loans Converted to Term Loans	0
Total	651	$ 561
Other Consumer | Consumer Portfolio Segment | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	21,400		93,659
2023	75,057		36,601
2022	33,794		23,962
2021	22,081		12,427
2020	11,253		11,367
Prior	22,161		14,609
Revolving Loans	11,824		13,353
Revolving Loans Converted to Term Loans	40		85
Total	197,610		206,063
Other Consumer | Consumer Portfolio Segment | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		170
2023	165		271
2022	162		153
2021	102		25
2020	31		12
Prior	80		92
Revolving Loans	29		40
Revolving Loans Converted to Term Loans	0		0
Total	569		763
Other Consumer | Consumer Portfolio Segment | Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, 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 Loans Converted to Term Loans	0		0
Total	0		0
Other Consumer | Consumer Portfolio Segment | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2024	0		50
2023	40		61
2022	113		25
2021	25		2
2020	0		14
Prior	16		34
Revolving Loans	28		7
Revolving Loans Converted to Term Loans	0		0
Total	$ 222		$ 193