Loans and the Allowance for Credit Losses - Summary of Amortized Cost Basis Loan Balances by Year of Origination and Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 18,673,748	$ 12,656,429
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	61,602	22,254
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,891	24,970
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	63,892	41,893
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	12,001	11,504
Amortized Cost Basis by Origination Year 2024	2,479	3,607
Amortized Cost Basis by Origination Year 2023	3,375	4,715
Amortized Cost Basis by Origination Year 2022	5,097	1,615
Amortized Cost Basis by Origination Year 2021	2,332	3,074
Amortized Cost Basis by Origination Year, Prior to 2020	44,585	26,351
Revolving Loans	949,459	768,526
Revolving Loans Converted to Term	1,601	1,718
Total loans	1,020,929	821,110
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	11,847	11,504
Amortized Cost Basis by Origination Year 2024	1,524	1,857
Amortized Cost Basis by Origination Year 2023	1,985	2,220
Amortized Cost Basis by Origination Year 2022	2,827	969
Amortized Cost Basis by Origination Year 2021	1,472	2,623
Amortized Cost Basis by Origination Year, Prior to 2020	39,175	22,444
Revolving Loans	945,852	763,157
Revolving Loans Converted to Term	1,363	1,251
Total loans	1,006,045	806,025
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	154
Amortized Cost Basis by Origination Year 2024	289	167
Amortized Cost Basis by Origination Year 2023	256	530
Amortized Cost Basis by Origination Year 2022	628	65
Amortized Cost Basis by Origination Year 2021	287	88
Amortized Cost Basis by Origination Year, Prior to 2020	1,627	1,226
Revolving Loans	3,166	5,166
Revolving Loans Converted to Term	15	178
Total loans	6,422	7,420
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	264	656
Amortized Cost Basis by Origination Year 2023	240	1,170
Amortized Cost Basis by Origination Year 2022	723	346
Amortized Cost Basis by Origination Year 2021	185	0
Amortized Cost Basis by Origination Year, Prior to 2020	790	636
Revolving Loans	101	91
Revolving Loans Converted to Term	29	144
Total loans	2,332	3,043
Home Equity [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	402	927
Amortized Cost Basis by Origination Year 2023	894	795
Amortized Cost Basis by Origination Year 2022	919	235
Amortized Cost Basis by Origination Year 2021	388	363
Amortized Cost Basis by Origination Year, Prior to 2020	2,993	2,045
Revolving Loans	340	112
Revolving Loans Converted to Term	194	145
Total loans	6,130	4,622
Home Equity [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024		355
Amortized Cost Basis by Origination Year 2023	221	132
Amortized Cost Basis by Origination Year 2022	89	65
Amortized Cost Basis by Origination Year 2021	8	35
Amortized Cost Basis by Origination Year, Prior to 2020	172	260
Revolving Loans	3	28
Revolving Loans Converted to Term		119
Total loans	493	994
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,501,846	7,326,681
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,673	8,478
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,433	8,148
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,766	23,641
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	36,970	201,454
Amortized Cost Basis by Origination Year 2024	246,257	195,340
Amortized Cost Basis by Origination Year 2023	291,705	324,426
Amortized Cost Basis by Origination Year 2022	777,031	398,043
Amortized Cost Basis by Origination Year 2021	670,070	168,767
Amortized Cost Basis by Origination Year, Prior to 2020	1,127,210	480,564
Revolving Loans Converted to Term	781,424	751,492
Total loans	3,930,667	2,520,086
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	36,970	201,454
Amortized Cost Basis by Origination Year 2024	245,025	195,121
Amortized Cost Basis by Origination Year 2023	289,426	323,588
Amortized Cost Basis by Origination Year 2022	772,299	397,596
Amortized Cost Basis by Origination Year 2021	665,505	168,526
Amortized Cost Basis by Origination Year, Prior to 2020	1,107,935	471,081
Revolving Loans Converted to Term	778,892	749,593
Total loans	3,896,052	2,506,959
Residential Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	67
Amortized Cost Basis by Origination Year 2021	1,391
Amortized Cost Basis by Origination Year, Prior to 2020	4,796	1,483
Revolving Loans Converted to Term	730
Total loans	6,984	1,483
Residential Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	579
Amortized Cost Basis by Origination Year 2023	430
Amortized Cost Basis by Origination Year 2022	1,675	319
Amortized Cost Basis by Origination Year 2021	1,198	37
Amortized Cost Basis by Origination Year, Prior to 2020	5,437	2,763
Revolving Loans Converted to Term		404
Total loans	9,319	3,523
Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	586	219
Amortized Cost Basis by Origination Year 2023	1,849	838
Amortized Cost Basis by Origination Year 2022	3,057	128
Amortized Cost Basis by Origination Year 2021	1,976	204
Amortized Cost Basis by Origination Year, Prior to 2020	9,042	5,237
Revolving Loans Converted to Term	1,802	1,495
Total loans	18,312	8,121
Residential Real Estate [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	11
Amortized Cost Basis by Origination Year 2023	50
Amortized Cost Basis by Origination Year 2022	17
Amortized Cost Basis by Origination Year 2021	2
Amortized Cost Basis by Origination Year, Prior to 2020	70	250
Revolving Loans Converted to Term	71	58
Total loans	221	308
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	27,028	52,438
Amortized Cost Basis by Origination Year 2024	103,616	57,608
Amortized Cost Basis by Origination Year 2023	93,688	38,399
Amortized Cost Basis by Origination Year 2022	111,228	12,623
Amortized Cost Basis by Origination Year 2021	36,267	5,930
Amortized Cost Basis by Origination Year, Prior to 2020	38,584	9,589
Revolving Loans	28,167	24,688
Total loans	438,578	201,275
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	26,981	51,073
Amortized Cost Basis by Origination Year 2024	101,819	55,821
Amortized Cost Basis by Origination Year 2023	91,213	36,994
Amortized Cost Basis by Origination Year 2022	107,448	11,744
Amortized Cost Basis by Origination Year 2021	34,857	5,640
Amortized Cost Basis by Origination Year, Prior to 2020	37,006	9,270
Revolving Loans	28,160	24,540
Total loans	427,484	195,082
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	47	774
Amortized Cost Basis by Origination Year 2024	846	1,225
Amortized Cost Basis by Origination Year 2023	1,290	765
Amortized Cost Basis by Origination Year 2022	1,978	602
Amortized Cost Basis by Origination Year 2021	685	205
Amortized Cost Basis by Origination Year, Prior to 2020	1,110	197
Revolving Loans	7	148
Total loans	5,963	3,916
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		271
Amortized Cost Basis by Origination Year 2024	439	327
Amortized Cost Basis by Origination Year 2023	432	517
Amortized Cost Basis by Origination Year 2022	601	161
Amortized Cost Basis by Origination Year 2021	268	51
Amortized Cost Basis by Origination Year, Prior to 2020	109	57
Total loans	1,849	1,384
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		320
Amortized Cost Basis by Origination Year 2024	512	235
Amortized Cost Basis by Origination Year 2023	753	123
Amortized Cost Basis by Origination Year 2022	1,201	116
Amortized Cost Basis by Origination Year 2021	457	34
Amortized Cost Basis by Origination Year, Prior to 2020	359	65
Total loans	3,282	893
Consumer [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		382
Amortized Cost Basis by Origination Year 2024	532	1,578
Amortized Cost Basis by Origination Year 2023	341	1,466
Amortized Cost Basis by Origination Year 2022	540	497
Amortized Cost Basis by Origination Year 2021	283	166
Amortized Cost Basis by Origination Year, Prior to 2020	126	313
Total loans	1,822	4,402
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	24,892	247,445
Amortized Cost Basis by Origination Year 2024	375,245	403,923
Amortized Cost Basis by Origination Year 2023	495,919	250,786
Amortized Cost Basis by Origination Year 2022	435,516	84,527
Amortized Cost Basis by Origination Year 2021	94,041	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	120,566	52,499
Revolving Loans	125,479	145,408
Revolving Loans Converted to Term	107,450	146,179
Total loans	1,779,108	1,352,083
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,832	832
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,376
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	33
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	24,892	245,699
Amortized Cost Basis by Origination Year 2024	373,474	403,923
Amortized Cost Basis by Origination Year 2023	493,485	249,690
Amortized Cost Basis by Origination Year 2022	410,229	84,527
Amortized Cost Basis by Origination Year 2021	81,416	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	118,871	52,485
Revolving Loans	125,322	145,032
Revolving Loans Converted to Term	105,084	144,702
Total loans	1,732,773	1,347,374
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		1,746
Amortized Cost Basis by Origination Year 2024	1,771
Amortized Cost Basis by Origination Year 2023	2,434	1,096
Amortized Cost Basis by Origination Year 2022	25,287
Amortized Cost Basis by Origination Year 2021	12,625
Amortized Cost Basis by Origination Year, Prior to 2020	1,039	10
Revolving Loans	157	376
Revolving Loans Converted to Term	1,534	645
Total loans	44,847	3,873
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year, Prior to 2020	656	4
Revolving Loans Converted to Term	832	832
Total loans	1,488	836
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024		813
Total loans		813
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	170,851	562,444
Amortized Cost Basis by Origination Year 2024	680,952	502,786
Amortized Cost Basis by Origination Year 2023	614,842	1,067,326
Amortized Cost Basis by Origination Year 2022	1,702,049	557,988
Amortized Cost Basis by Origination Year 2021	1,011,634	529,601
Amortized Cost Basis by Origination Year, Prior to 2020	3,526,037	1,973,937
Revolving Loans	277,958	202,020
Revolving Loans Converted to Term	738,415	578,496
Total loans	8,722,738	5,974,598
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,841	7,646
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,057	8,148
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,733	23,641
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	170,601	542,333
Amortized Cost Basis by Origination Year 2024	653,220	472,746
Amortized Cost Basis by Origination Year 2023	587,412	1,038,745
Amortized Cost Basis by Origination Year 2022	1,633,209	543,212
Amortized Cost Basis by Origination Year 2021	977,864	512,916
Amortized Cost Basis by Origination Year, Prior to 2020	3,342,086	1,897,950
Revolving Loans	275,900	200,572
Revolving Loans Converted to Term	655,742	482,132
Total loans	8,296,034	5,690,606
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		365
Amortized Cost Basis by Origination Year 2024	8,059	28,204
Amortized Cost Basis by Origination Year 2023	21,021	5,188
Amortized Cost Basis by Origination Year 2022	38,561	13,590
Amortized Cost Basis by Origination Year 2021	29,305	6,733
Amortized Cost Basis by Origination Year, Prior to 2020	135,051	39,845
Revolving Loans	482	825
Revolving Loans Converted to Term	77,050	94,572
Total loans	309,529	189,322
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	250	19,746
Amortized Cost Basis by Origination Year 2024	19,673	1,836
Amortized Cost Basis by Origination Year 2023	6,409	23,393
Amortized Cost Basis by Origination Year 2022	30,279	1,186
Amortized Cost Basis by Origination Year 2021	4,465	9,952
Amortized Cost Basis by Origination Year, Prior to 2020	48,900	36,142
Revolving Loans	1,576	623
Revolving Loans Converted to Term	5,623	1,792
Total loans	117,175	94,670
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2023		75
Amortized Cost Basis by Origination Year 2022		7
Amortized Cost Basis by Origination Year, Prior to 2020	15	855
Revolving Loans Converted to Term	18
Total loans	33	937
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	70,727	227,055
Amortized Cost Basis by Origination Year 2024	317,925	147,177
Amortized Cost Basis by Origination Year 2023	226,067	210,747
Amortized Cost Basis by Origination Year 2022	408,203	108,592
Amortized Cost Basis by Origination Year 2021	235,184	49,947
Amortized Cost Basis by Origination Year, Prior to 2020	396,735	260,737
Revolving Loans	985,428	639,755
Revolving Loans Converted to Term	141,459	143,267
Total loans	2,781,728	1,787,277
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,560	957
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,958	8,872
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,402	4,616
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	70,478	225,344
Amortized Cost Basis by Origination Year 2024	306,508	139,460
Amortized Cost Basis by Origination Year 2023	216,220	206,252
Amortized Cost Basis by Origination Year 2022	394,267	106,446
Amortized Cost Basis by Origination Year 2021	223,356	48,285
Amortized Cost Basis by Origination Year, Prior to 2020	378,733	250,438
Revolving Loans	918,531	616,831
Revolving Loans Converted to Term	126,603	128,253
Total loans	2,634,696	1,721,309
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	249	217
Amortized Cost Basis by Origination Year 2024	9,598	7,335
Amortized Cost Basis by Origination Year 2023	9,593	3,337
Amortized Cost Basis by Origination Year 2022	9,406	921
Amortized Cost Basis by Origination Year 2021	8,920	1,597
Amortized Cost Basis by Origination Year, Prior to 2020	13,879	7,660
Revolving Loans	57,597	20,464
Revolving Loans Converted to Term	7,001	7,274
Total loans	116,243	48,805
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		1,494
Amortized Cost Basis by Origination Year 2024	1,819	382
Amortized Cost Basis by Origination Year 2023	254	1,158
Amortized Cost Basis by Origination Year 2022	4,530	1,225
Amortized Cost Basis by Origination Year 2021	2,908	65
Amortized Cost Basis by Origination Year, Prior to 2020	4,123	2,639
Revolving Loans	9,300	2,460
Revolving Loans Converted to Term	7,855	7,740
Total loans	30,789	17,163
Commercial and Industrial [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025		48
Amortized Cost Basis by Origination Year 2024		648
Amortized Cost Basis by Origination Year 2023	461	1,048
Amortized Cost Basis by Origination Year 2022	84	228
Amortized Cost Basis by Origination Year 2021	314	162
Amortized Cost Basis by Origination Year, Prior to 2020	54	1,029
Revolving Loans		1
Revolving Loans Converted to Term	107	7,369
Total loans	$ 1,020	$ 10,533