Loans and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	$ 1,685,825	$ 3,481,250
2022	3,116,426	2,447,552
2021	2,223,220	1,630,538
2020	1,459,559	1,094,274
2019	921,574	779,687
Prior	2,846,088	2,496,108
Revolving Loans	1,674,790	1,614,995
Revolving Loans Converted to Term Loans	20,878	18,124
Total	13,948,360	13,562,528
Current period gross charge-offs
Total	15,092	4,831	$ 9,002
Commercial Portfolio Segment | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	482,901	780,736
2022	480,687	490,827
2021	367,551	425,901
2020	355,211	204,752
2019	140,730	103,461
Prior	644,484	647,702
Revolving Loans	544,357	478,083
Revolving Loans Converted to Term Loans	3,710	1,066
Total	3,019,631	3,132,528
Current period gross charge-offs
2023	0
2022	2
2021	0
2020	0
2019	0
Prior	11
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	13	269	1,558
Commercial Portfolio Segment | Commercial and industrial | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	477,138	778,144
2022	442,896	479,317
2021	350,782	415,990
2020	341,243	199,865
2019	140,641	100,716
Prior	641,342	639,825
Revolving Loans	485,448	473,148
Revolving Loans Converted to Term Loans	3,255	50
Total	2,882,745	3,087,055
Commercial Portfolio Segment | Commercial and industrial | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	4,229	2,298
2022	25,796	1,307
2021	14,994	7,267
2020	13,563	4,841
2019	89	147
Prior	553	0
Revolving Loans	51,106	1,196
Revolving Loans Converted to Term Loans	455	670
Total	110,785	17,726
Commercial Portfolio Segment | Commercial and industrial | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	1,534	294
2022	11,995	4,954
2021	1,775	2,644
2020	405	46
2019	0	2,598
Prior	2,581	7,854
Revolving Loans	7,803	485
Revolving Loans Converted to Term Loans	0	346
Total	26,093	19,221
Commercial Portfolio Segment | Commercial and industrial | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	5,249
2021	0	0
2020	0	0
2019	0	0
Prior	8	23
Revolving Loans	0	3,254
Revolving Loans Converted to Term Loans	0	0
Total	8	8,526
Commercial Portfolio Segment | Commercial and industrial | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	544,143	1,510,675
2022	1,456,472	825,620
2021	870,251	589,959
2020	578,044	605,840
2019	552,383	501,194
Prior	1,394,411	1,053,298
Revolving Loans	55,587	60,590
Revolving Loans Converted to Term Loans	2,556	4,187
Total	5,453,847	5,151,363
Current period gross charge-offs
2023	2,008
2022	0
2021	0
2020	0
2019	0
Prior	6,000
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	8,008	0	247
Commercial Portfolio Segment | Commercial real estate | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	498,590	1,510,675
2022	1,435,893	825,620
2021	855,014	586,567
2020	573,370	581,840
2019	516,689	461,296
Prior	1,291,189	1,006,160
Revolving Loans	47,581	52,590
Revolving Loans Converted to Term Loans	2,556	4,187
Total	5,220,882	5,028,935
Commercial Portfolio Segment | Commercial real estate | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	15,200	0
2022	7,990	0
2021	0	771
2020	736	4,204
2019	2,281	15,366
Prior	34,803	12,255
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	61,010	32,596
Commercial Portfolio Segment | Commercial real estate | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	19,738	0
2022	12,589	0
2021	15,237	2,621
2020	3,938	19,796
2019	33,413	24,532
Prior	48,978	34,883
Revolving Loans	8,006	8,000
Revolving Loans Converted to Term Loans	0	0
Total	141,899	89,832
Commercial Portfolio Segment | Commercial real estate | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	10,615	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	19,441	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	30,056	0
Commercial Portfolio Segment | Commercial real estate | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	133,919	91,397
2022	151,957	178,648
2021	96,147	31,317
2020	0	20,767
2019	0	0
Prior	0	0
Revolving Loans	2,614	12,130
Revolving Loans Converted to Term Loans	0	0
Total	384,637	334,259
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	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]
2023	133,463	91,397
2022	151,957	178,648
2021	96,147	28,956
2020	0	20,767
2019	0	0
Prior	0	0
Revolving Loans	2,614	12,130
Revolving Loans Converted to Term Loans	0	0
Total	384,181	331,898
Commercial Portfolio Segment | Commercial construction | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	456	0
2022	0	0
2021	0	2,361
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	456	2,361
Commercial Portfolio Segment | Commercial construction | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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 | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	142,021	178,806
2022	168,396	206,703
2021	186,299	176,147
2020	152,545	135,731
2019	117,301	63,762
Prior	244,758	248,643
Revolving Loans	73,671	80,455
Revolving Loans Converted to Term Loans	4,602	4,991
Total	1,089,593	1,095,238
Current period gross charge-offs
2023	188
2022	161
2021	1,596
2020	86
2019	654
Prior	590
Revolving Loans	0
Revolving Loans Converted to Term Loans	1,370
Total	4,645	2,292	5,091
Commercial Portfolio Segment | Business banking | Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	139,237	178,806
2022	165,247	202,230
2021	182,606	170,088
2020	146,180	128,282
2019	110,638	59,452
Prior	229,636	233,484
Revolving Loans	73,054	78,080
Revolving Loans Converted to Term Loans	3,996	4,770
Total	1,050,594	1,055,192
Commercial Portfolio Segment | Business banking | Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	1,474	0
2022	2,553	991
2021	1,009	4,635
2020	4,294	4,605
2019	4,692	3,740
Prior	11,479	7,584
Revolving Loans	23	145
Revolving Loans Converted to Term Loans	27	0
Total	25,551	21,700
Commercial Portfolio Segment | Business banking | Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	1,310	0
2022	596	3,482
2021	2,684	1,424
2020	2,071	2,663
2019	1,464	570
Prior	3,423	7,505
Revolving Loans	594	2,230
Revolving Loans Converted to Term Loans	579	221
Total	12,721	18,095
Commercial Portfolio Segment | Business banking | Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	181
2019	507	0
Prior	220	70
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	727	251
Commercial Portfolio Segment | Business banking | Loss
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	258,421	766,094
2022	737,367	702,429
2021	669,681	383,651
2020	356,406	103,747
2019	95,601	70,668
Prior	464,989	453,466
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	2,582,465	2,480,055
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0	35
Residential Portfolio Segment | Residential real estate | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	257,671	761,442
2022	728,997	696,959
2021	665,811	382,262
2020	354,003	99,494
2019	93,817	66,702
Prior	451,812	434,720
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	2,552,111	2,441,579
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]
2023	750	4,652
2022	6,615	5,470
2021	2,437	1,245
2020	2,112	2,762
2019	1,496	2,951
Prior	8,219	11,646
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	21,629	28,726
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]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	0	0
2022	1,755	0
2021	1,433	144
2020	291	1,491
2019	288	1,015
Prior	4,958	7,100
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	8,725	9,750
Consumer Portfolio Segment | Consumer home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	30,541	97,954
2022	84,614	10,774
2021	9,151	5,840
2020	4,899	5,076
2019	4,166	21,438
Prior	82,711	76,174
Revolving Loans	985,161	966,188
Revolving Loans Converted to Term Loans	9,925	7,863
Total	1,211,168	1,191,307
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	7
Revolving Loans Converted to Term Loans	0
Total	7	1	24
Consumer Portfolio Segment | Consumer home equity | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	30,393	97,395
2022	84,065	10,774
2021	9,151	5,840
2020	4,899	5,015
2019	4,166	21,092
Prior	80,687	73,927
Revolving Loans	970,882	953,829
Revolving Loans Converted to Term Loans	9,472	7,320
Total	1,193,715	1,175,192
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]
2023	148	559
2022	483	0
2021	0	0
2020	0	0
2019	0	72
Prior	558	944
Revolving Loans	7,509	7,239
Revolving Loans Converted to Term Loans	223	247
Total	8,921	9,061
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]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	0	0
2022	66	0
2021	0	0
2020	0	61
2019	0	274
Prior	1,466	1,303
Revolving Loans	6,770	5,120
Revolving Loans Converted to Term Loans	230	296
Total	8,532	7,054
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	93,879	55,588
2022	36,933	32,551
2021	24,140	17,723
2020	12,454	18,361
2019	11,393	19,164
Prior	14,735	16,825
Revolving Loans	13,400	17,549
Revolving Loans Converted to Term Loans	85	17
Total	207,019	177,778
Current period gross charge-offs
2023	1,047
2022	411
2021	329
2020	92
2019	111
Prior	260
Revolving Loans	169
Revolving Loans Converted to Term Loans	0
Total	2,419	2,269	$ 2,047
Consumer Portfolio Segment | Other Consumer | Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	93,659	55,414
2022	36,601	32,390
2021	23,962	17,641
2020	12,427	18,298
2019	11,367	18,832
Prior	14,609	16,603
Revolving Loans	13,353	17,476
Revolving Loans Converted to Term Loans	85	0
Total	206,063	176,654
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]
2023	170	143
2022	271	68
2021	153	43
2020	25	61
2019	12	240
Prior	92	178
Revolving Loans	40	58
Revolving Loans Converted to Term Loans	0	7
Total	763	798
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]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	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]
2023	50	31
2022	61	93
2021	25	39
2020	2	2
2019	14	92
Prior	34	44
Revolving Loans	7	15
Revolving Loans Converted to Term Loans	0	10
Total	$ 193	$ 326