Loans and Allowance for Credit Losses - Schedule of Internal Risk-rating Categories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	$ 1,481,079	$ 1,685,825
Fiscal year before current fiscal year	1,887,458	3,116,426
Two years before current fiscal year	3,630,977	2,223,220
Three years before current fiscal year	2,680,516	1,459,559
Four years before current fiscal year	1,802,701	921,574
Prior	4,269,764	2,846,088
Revolving Loans	1,967,952	1,674,790
Revolving Loans Converted to Term Loans	57,907	20,878
Total	17,778,354	13,948,360
Current period gross charge-offs
Total	47,757	15,092	$ 4,831
Commercial Portfolio Segment | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	378,771	482,901
Fiscal year before current fiscal year	412,949	480,687
Two years before current fiscal year	449,118	367,551
Three years before current fiscal year	335,468	355,211
Four years before current fiscal year	343,216	140,730
Prior	751,752	644,484
Revolving Loans	571,283	544,357
Revolving Loans Converted to Term Loans	24,018	3,710
Total	3,266,575	3,019,631
Current period gross charge-offs
2024	0
2023	0
2022	30
2021	0
2020	0
Prior	10
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	40	13	269
Commercial Portfolio Segment | Commercial and industrial | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	358,054	477,138
Fiscal year before current fiscal year	365,372	442,896
Two years before current fiscal year	407,129	350,782
Three years before current fiscal year	310,250	341,243
Four years before current fiscal year	341,049	140,641
Prior	745,815	641,342
Revolving Loans	522,236	485,448
Revolving Loans Converted to Term Loans	22,800	3,255
Total	3,072,705	2,882,745
Commercial Portfolio Segment | Commercial and industrial | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	19,721	4,229
Fiscal year before current fiscal year	25,719	25,796
Two years before current fiscal year	5,963	14,994
Three years before current fiscal year	24,199	13,563
Four years before current fiscal year	43	89
Prior	4,563	553
Revolving Loans	26,522	51,106
Revolving Loans Converted to Term Loans	508	455
Total	107,238	110,785
Commercial Portfolio Segment | Commercial and industrial | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	996	1,534
Fiscal year before current fiscal year	21,858	11,995
Two years before current fiscal year	30,731	1,775
Three years before current fiscal year	1,019	405
Four years before current fiscal year	2,124	0
Prior	1,366	2,581
Revolving Loans	22,525	7,803
Revolving Loans Converted to Term Loans	710	0
Total	81,329	26,093
Commercial Portfolio Segment | Commercial and industrial | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	5,295	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	8	8
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	5,303	8
Commercial Portfolio Segment | Commercial and industrial | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Commercial Portfolio Segment | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	544,100	544,143
Fiscal year before current fiscal year	683,960	1,456,472
Two years before current fiscal year	1,784,643	870,251
Three years before current fiscal year	1,052,679	578,044
Four years before current fiscal year	736,054	552,383
Prior	2,146,409	1,394,411
Revolving Loans	85,638	55,587
Revolving Loans Converted to Term Loans	10,595	2,556
Total	7,044,078	5,453,847
Current period gross charge-offs
2024	1,113
2023	4,220
2022	0
2021	0
2020	5,182
Prior	32,041
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	42,556	8,008	0
Commercial Portfolio Segment | Commercial real estate | Non-accrual
Current period gross charge-offs
Total	41,300
Commercial Portfolio Segment | Commercial real estate | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	531,193	498,590
Fiscal year before current fiscal year	575,929	1,435,893
Two years before current fiscal year	1,740,688	855,014
Three years before current fiscal year	1,020,015	573,370
Four years before current fiscal year	722,669	516,689
Prior	1,988,069	1,291,189
Revolving Loans	82,661	47,581
Revolving Loans Converted to Term Loans	10,595	2,556
Total	6,671,819	5,220,882
Commercial Portfolio Segment | Commercial real estate | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	9,457	15,200
Fiscal year before current fiscal year	45,188	7,990
Two years before current fiscal year	26,551	0
Three years before current fiscal year	14,613	736
Four years before current fiscal year	8,855	2,281
Prior	35,952	34,803
Revolving Loans	2,976	0
Revolving Loans Converted to Term Loans	0	0
Total	143,592	61,010
Commercial Portfolio Segment | Commercial real estate | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	19,738
Fiscal year before current fiscal year	45,762	12,589
Two years before current fiscal year	17,404	15,237
Three years before current fiscal year	18,051	3,938
Four years before current fiscal year	293	33,413
Prior	44,713	48,978
Revolving Loans	1	8,006
Revolving Loans Converted to Term Loans	0	0
Total	126,224	141,899
Commercial Portfolio Segment | Commercial real estate | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	3,450	10,615
Fiscal year before current fiscal year	17,081	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	4,237	0
Prior	77,675	19,441
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	102,443	30,056
Commercial Portfolio Segment | Commercial real estate | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Commercial Portfolio Segment | Commercial construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	97,208	133,919
Fiscal year before current fiscal year	229,600	151,957
Two years before current fiscal year	132,389	96,147
Three years before current fiscal year	16,836	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	15,616	2,614
Revolving Loans Converted to Term Loans	0	0
Total	491,649	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	0
Commercial Portfolio Segment | Commercial construction | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	96,423	133,463
Fiscal year before current fiscal year	228,979	151,957
Two years before current fiscal year	132,389	96,147
Three years before current fiscal year	16,836	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	15,616	2,614
Revolving Loans Converted to Term Loans	0	0
Total	490,243	384,181
Commercial Portfolio Segment | Commercial construction | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	456
Fiscal year before current fiscal year	621	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	621	456
Commercial Portfolio Segment | Commercial construction | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	785	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	785	0
Commercial Portfolio Segment | Commercial construction | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Commercial Portfolio Segment | Commercial construction | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Commercial Portfolio Segment | Business banking
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	173,957	142,021
Fiscal year before current fiscal year	142,211	168,396
Two years before current fiscal year	182,203	186,299
Three years before current fiscal year	211,691	152,545
Four years before current fiscal year	157,882	117,301
Prior	457,503	244,758
Revolving Loans	103,439	73,671
Revolving Loans Converted to Term Loans	6,317	4,602
Total	1,435,203	1,089,593
Current period gross charge-offs
2024	31
2023	647
2022	145
2021	671
2020	329
Prior	270
Revolving Loans	0
Revolving Loans Converted to Term Loans	405
Total	2,498	4,645	2,292
Commercial Portfolio Segment | Business banking | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	173,110	139,237
Fiscal year before current fiscal year	141,000	165,247
Two years before current fiscal year	178,696	182,606
Three years before current fiscal year	208,835	146,180
Four years before current fiscal year	156,366	110,638
Prior	441,532	229,636
Revolving Loans	103,222	73,054
Revolving Loans Converted to Term Loans	5,040	3,996
Total	1,407,801	1,050,594
Commercial Portfolio Segment | Business banking | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	533	1,474
Fiscal year before current fiscal year	60	2,553
Two years before current fiscal year	1,409	1,009
Three years before current fiscal year	1,929	4,294
Four years before current fiscal year	0	4,692
Prior	6,203	11,479
Revolving Loans	20	23
Revolving Loans Converted to Term Loans	262	27
Total	10,416	25,551
Commercial Portfolio Segment | Business banking | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	314	1,310
Fiscal year before current fiscal year	1,102	596
Two years before current fiscal year	1,000	2,684
Three years before current fiscal year	911	2,071
Four years before current fiscal year	1,516	1,464
Prior	9,402	3,423
Revolving Loans	197	594
Revolving Loans Converted to Term Loans	297	579
Total	14,739	12,721
Commercial Portfolio Segment | Business banking | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	49	0
Two years before current fiscal year	1,098	0
Three years before current fiscal year	16	0
Four years before current fiscal year	0	507
Prior	366	220
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	718	0
Total	2,247	727
Commercial Portfolio Segment | Business banking | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Residential Portfolio Segment | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	215,072	258,421
Fiscal year before current fiscal year	323,500	737,367
Two years before current fiscal year	981,032	669,681
Three years before current fiscal year	1,038,826	356,406
Four years before current fiscal year	552,771	95,601
Prior	817,181	464,989
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	3,928,382	2,582,465
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	28
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	28	0	0
Residential Portfolio Segment | Residential real estate | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	213,244	257,671
Fiscal year before current fiscal year	321,097	728,997
Two years before current fiscal year	970,831	665,811
Three years before current fiscal year	1,032,297	354,003
Four years before current fiscal year	548,987	93,817
Prior	800,995	451,812
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	3,887,451	2,552,111
Residential Portfolio Segment | Residential real estate | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	944	750
Fiscal year before current fiscal year	2,300	6,615
Two years before current fiscal year	6,480	2,437
Three years before current fiscal year	5,437	2,112
Four years before current fiscal year	3,209	1,496
Prior	9,606	8,219
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	27,976	21,629
Residential Portfolio Segment | 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]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Residential Portfolio Segment | Residential real estate | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	884	0
Fiscal year before current fiscal year	103	1,755
Two years before current fiscal year	3,721	1,433
Three years before current fiscal year	1,092	291
Four years before current fiscal year	575	288
Prior	6,580	4,958
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	12,955	8,725
Consumer Portfolio Segment | Consumer home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	10,425	30,541
Fiscal year before current fiscal year	32,911	84,614
Two years before current fiscal year	74,549	9,151
Three years before current fiscal year	7,954	4,899
Four years before current fiscal year	4,293	4,166
Prior	79,355	82,711
Revolving Loans	1,158,883	985,161
Revolving Loans Converted to Term Loans	16,918	9,925
Total	1,385,288	1,211,168
Current period gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	2
Revolving Loans	57
Revolving Loans Converted to Term Loans	0
Total	59	7	1
Consumer Portfolio Segment | Consumer home equity | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	10,425	30,393
Fiscal year before current fiscal year	32,573	84,065
Two years before current fiscal year	74,385	9,151
Three years before current fiscal year	7,954	4,899
Four years before current fiscal year	4,293	4,166
Prior	76,953	80,687
Revolving Loans	1,143,767	970,882
Revolving Loans Converted to Term Loans	15,629	9,472
Total	1,365,979	1,193,715
Consumer Portfolio Segment | Consumer home equity | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	148
Fiscal year before current fiscal year	275	483
Two years before current fiscal year	103	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	1,179	558
Revolving Loans	6,965	7,509
Revolving Loans Converted to Term Loans	574	223
Total	9,096	8,921
Consumer Portfolio Segment | Consumer home equity | Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Consumer Portfolio Segment | Consumer home equity | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	63	66
Two years before current fiscal year	61	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	1,223	1,466
Revolving Loans	8,151	6,770
Revolving Loans Converted to Term Loans	715	230
Total	10,213	8,532
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	61,546	93,879
Fiscal year before current fiscal year	62,327	36,933
Two years before current fiscal year	27,043	24,140
Three years before current fiscal year	17,062	12,454
Four years before current fiscal year	8,485	11,393
Prior	17,564	14,735
Revolving Loans	33,093	13,400
Revolving Loans Converted to Term Loans	59	85
Total	227,179	207,019
Current period gross charge-offs
2024	1,100
2023	420
2022	426
2021	248
2020	64
Prior	131
Revolving Loans	139
Revolving Loans Converted to Term Loans	48
Total	2,576	2,419	$ 2,269
Consumer Portfolio Segment | Other Consumer | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	61,430	93,659
Fiscal year before current fiscal year	62,170	36,601
Two years before current fiscal year	26,869	23,962
Three years before current fiscal year	16,970	12,427
Four years before current fiscal year	8,453	11,367
Prior	16,914	14,609
Revolving Loans	32,914	13,353
Revolving Loans Converted to Term Loans	19	85
Total	225,739	206,063
Consumer Portfolio Segment | Other Consumer | 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	116	170
Fiscal year before current fiscal year	146	271
Two years before current fiscal year	143	153
Three years before current fiscal year	75	25
Four years before current fiscal year	25	12
Prior	646	92
Revolving Loans	135	40
Revolving Loans Converted to Term Loans	15	0
Total	1,301	763
Consumer Portfolio Segment | Other Consumer | Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Consumer Portfolio Segment | Other Consumer | Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	50
Fiscal year before current fiscal year	11	61
Two years before current fiscal year	31	25
Three years before current fiscal year	17	2
Four years before current fiscal year	7	14
Prior	4	34
Revolving Loans	44	7
Revolving Loans Converted to Term Loans	25	0
Total	$ 139	$ 193