Loans and Allowance for Credit Losses - Schedule of Internal Risk-rating Categories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	$ 406,340		$ 1,481,079
2024	1,429,258		1,887,458
2023	1,856,437		3,630,977
2022	3,624,566		2,680,516
2021	2,662,971		1,802,701
Prior	5,921,782		4,269,764
Revolving Loans	2,004,002		1,967,952
Revolving Loans Converted to Term Loans	10,339		57,907
Total	17,915,695		17,778,354
Current period gross charge-offs
Total	12,487	$ 8,015
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	162,774		378,771
2024	350,560		412,949
2023	366,276		449,118
2022	462,876		335,468
2021	373,278		343,216
Prior	1,099,410		751,752
Revolving Loans	597,177		571,283
Revolving Loans Converted to Term Loans	342		24,018
Total	3,412,693		3,266,575
Current period gross charge-offs
2025	0
2024	0
2023	0
2022	0
2021	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]
2025	162,327		358,054
2024	327,147		365,372
2023	319,330		407,129
2022	418,022		310,250
2021	349,770		341,049
Prior	1,091,112		745,815
Revolving Loans	560,008		522,236
Revolving Loans Converted to Term Loans	342		22,800
Total	3,228,058		3,072,705
Commercial and industrial | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	447		19,721
2024	21,288		25,719
2023	26,397		5,963
2022	6,776		24,199
2021	22,611		43
Prior	3,616		4,563
Revolving Loans	17,407		26,522
Revolving Loans Converted to Term Loans	0		508
Total	98,542		107,238
Commercial and industrial | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		996
2024	2,125		21,858
2023	20,549		30,731
2022	34,283		1,019
2021	897		2,124
Prior	4,674		1,366
Revolving Loans	19,762		22,525
Revolving Loans Converted to Term Loans	0		710
Total	82,290		81,329
Commercial and industrial | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		0
2023	0		5,295
2022	3,795		0
2021	0		0
Prior	8		8
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	3,803		5,303
Commercial and industrial | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	136,073		544,100
2024	502,322		683,960
2023	727,466		1,784,643
2022	1,828,287		1,052,679
2021	1,033,077		736,054
Prior	2,784,252		2,146,409
Revolving Loans	95,132		85,638
Revolving Loans Converted to Term Loans	0		10,595
Total	7,106,609		7,044,078
Current period gross charge-offs
2025	0
2024	0
2023	3,492
2022	0
2021	0
Prior	8,095
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	11,587	7,250
Commercial real estate | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	136,073		531,193
2024	489,986		575,929
2023	601,770		1,740,688
2022	1,779,400		1,020,015
2021	996,888		722,669
Prior	2,625,087		1,988,069
Revolving Loans	92,600		82,661
Revolving Loans Converted to Term Loans	0		10,595
Total	6,721,804		6,671,819
Commercial real estate | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		9,457
2024	8,956		45,188
2023	67,813		26,551
2022	36,046		14,613
2021	30,716		8,855
Prior	73,443		35,952
Revolving Loans	2,531		2,976
Revolving Loans Converted to Term Loans	0		0
Total	219,505		143,592
Commercial real estate | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		45,762
2023	44,571		17,404
2022	12,841		18,051
2021	5,473		293
Prior	44,317		44,713
Revolving Loans	1		1
Revolving Loans Converted to Term Loans	0		0
Total	107,203		126,224
Commercial real estate | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		3,450
2024	3,380		17,081
2023	13,312		0
2022	0		0
2021	0		4,237
Prior	41,405		77,675
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	58,097		102,443
Commercial real estate | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	19,571		97,208
2024	128,638		229,600
2023	216,845		132,389
2022	91,534		16,836
2021	969		0
Prior	0		0
Revolving Loans	1,563		15,616
Revolving Loans Converted to Term Loans	0		0
Total	459,120		491,649
Current period gross charge-offs
2025	0
2024	0
2023	0
2022	0
2021	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]
2025	19,571		96,423
2024	127,355		228,979
2023	216,205		132,389
2022	91,534		16,836
2021	969		0
Prior	0		0
Revolving Loans	1,563		15,616
Revolving Loans Converted to Term Loans	0		0
Total	457,197		490,243
Commercial construction | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	1,283		621
2023	640		0
2022	0		0
2021	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	1,923		621
Commercial construction | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		785
2024	0		0
2023	0		0
2022	0		0
2021	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	0		785
Commercial construction | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	33,446		173,957
2024	170,197		142,211
2023	138,235		182,203
2022	176,781		211,691
2021	206,457		157,882
Prior	581,008		457,503
Revolving Loans	97,922		103,439
Revolving Loans Converted to Term Loans	3,686		6,317
Total	1,407,732		1,435,203
Current period gross charge-offs
2025	0
2024	0
2023	114
2022	17
2021	2
Prior	187
Revolving Loans	0
Revolving Loans Converted to Term Loans	22
Total	342	102
Business banking | Pass | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	33,446		173,110
2024	168,586		141,000
2023	136,110		178,696
2022	171,679		208,835
2021	202,551		156,366
Prior	568,677		441,532
Revolving Loans	97,715		103,222
Revolving Loans Converted to Term Loans	3,686		5,040
Total	1,382,450		1,407,801
Business banking | Special Mention | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		533
2024	1,306		60
2023	246		1,409
2022	1,156		1,929
2021	1,994		0
Prior	4,560		6,203
Revolving Loans	0		20
Revolving Loans Converted to Term Loans	0		262
Total	9,262		10,416
Business banking | Substandard | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		314
2024	305		1,102
2023	1,481		1,000
2022	2,848		911
2021	1,898		1,516
Prior	7,468		9,402
Revolving Loans	207		197
Revolving Loans Converted to Term Loans	0		297
Total	14,207		14,739
Business banking | Doubtful | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		49
2023	398		1,098
2022	1,098		16
2021	14		0
Prior	303		366
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		718
Total	1,813		2,247
Business banking | Loss | Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	39,513		215,072
2024	213,108		323,500
2023	317,747		981,032
2022	968,379		1,038,826
2021	1,025,929		552,771
Prior	1,341,496		817,181
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	3,906,172		3,928,382
Current period gross charge-offs
2025	0
2024	0
2023	0
2022	0
2021	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	10
Residential real estate | Residential Real Estate | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	39,513		213,244
2024	212,226		321,097
2023	316,169		970,831
2022	959,703		1,032,297
2021	1,020,729		548,987
Prior	1,326,354		800,995
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	3,874,694		3,887,451
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]
2025	0		944
2024	882		2,300
2023	1,578		6,480
2022	4,356		5,437
2021	4,866		3,209
Prior	7,392		9,606
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	19,074		27,976
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]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	0		884
2024	0		103
2023	0		3,721
2022	4,320		1,092
2021	334		575
Prior	7,750		6,580
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	12,404		12,955
Consumer home equity | Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	496		10,425
2024	10,177		32,911
2023	31,376		74,549
2022	71,710		7,954
2021	7,753		4,293
Prior	92,859		79,355
Revolving Loans	1,184,596		1,158,883
Revolving Loans Converted to Term Loans	6,277		16,918
Total	1,405,244		1,385,288
Current period gross charge-offs
2025	0
2024	0
2023	0
2022	0
2021	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	2
Consumer home equity | Consumer Portfolio Segment | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	496		10,425
2024	10,177		32,573
2023	31,243		74,385
2022	71,259		7,954
2021	7,753		4,293
Prior	89,717		76,953
Revolving Loans	1,169,012		1,143,767
Revolving Loans Converted to Term Loans	5,797		15,629
Total	1,385,454		1,365,979
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]
2025	0		0
2024	0		275
2023	133		103
2022	451		0
2021	0		0
Prior	924		1,179
Revolving Loans	9,604		6,965
Revolving Loans Converted to Term Loans	249		574
Total	11,361		9,096
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]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	0		0
2024	0		63
2023	0		61
2022	0		0
2021	0		0
Prior	2,218		1,223
Revolving Loans	5,980		8,151
Revolving Loans Converted to Term Loans	231		715
Total	8,429		10,213
Other Consumer | Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	14,467		61,546
2024	54,256		62,327
2023	58,492		27,043
2022	24,999		17,062
2021	15,508		8,485
Prior	22,757		17,564
Revolving Loans	27,612		33,093
Revolving Loans Converted to Term Loans	34		59
Total	218,125		227,179
Current period gross charge-offs
2025	266
2024	68
2023	50
2022	68
2021	25
Prior	38
Revolving Loans	43
Revolving Loans Converted to Term Loans	0
Total	558	$ 651
Other Consumer | Consumer Portfolio Segment | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2025	14,452		61,430
2024	54,181		62,170
2023	58,361		26,869
2022	24,907		16,970
2021	15,400		8,453
Prior	22,112		16,914
Revolving Loans	27,518		32,914
Revolving Loans Converted to Term Loans	34		19
Total	216,965		225,739
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]
2025	15		116
2024	44		146
2023	130		143
2022	55		75
2021	84		25
Prior	631		646
Revolving Loans	54		135
Revolving Loans Converted to Term Loans	0		15
Total	1,013		1,301
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]
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	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]
2025	0		0
2024	31		11
2023	1		31
2022	37		17
2021	24		7
Prior	14		4
Revolving Loans	40		44
Revolving Loans Converted to Term Loans	0		25
Total	$ 147		$ 139