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	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 18,828,626	$ 12,656,429
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	37,416	22,254
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,091	24,970
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	82,943	41,893
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	13,603	11,504
Amortized Cost Basis by Origination Year 2024	3,960	3,607
Amortized Cost Basis by Origination Year 2023	4,190	4,715
Amortized Cost Basis by Origination Year 2022	5,523	1,615
Amortized Cost Basis by Origination Year 2021	2,389	3,074
Amortized Cost Basis by Origination Year, Prior to 2020	28,785	26,351
Revolving Loans	974,214	768,526
Revolving Loans Converted to Term	19,670	1,718
Total loans	1,052,334	821,110
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	13,475	11,504
Amortized Cost Basis by Origination Year 2024	2,428	1,857
Amortized Cost Basis by Origination Year 2023	1,850	2,220
Amortized Cost Basis by Origination Year 2022	3,032	969
Amortized Cost Basis by Origination Year 2021	1,460	2,623
Amortized Cost Basis by Origination Year, Prior to 2020	22,967	22,444
Revolving Loans	968,539	763,157
Revolving Loans Converted to Term	17,714	1,251
Total loans	1,031,465	806,025
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	102
Amortized Cost Basis by Origination Year 2024	657	167
Amortized Cost Basis by Origination Year 2023	586	530
Amortized Cost Basis by Origination Year 2022	1,269	65
Amortized Cost Basis by Origination Year 2021	246	88
Amortized Cost Basis by Origination Year, Prior to 2020	2,087	1,226
Revolving Loans	5,553	5,166
Revolving Loans Converted to Term	728	178
Total loans	11,228	7,420
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	26
Amortized Cost Basis by Origination Year 2024	586	656
Amortized Cost Basis by Origination Year 2023	285	1,170
Amortized Cost Basis by Origination Year 2022	478	346
Amortized Cost Basis by Origination Year 2021	243	0
Amortized Cost Basis by Origination Year, Prior to 2020	1,183	636
Revolving Loans	76	91
Revolving Loans Converted to Term	600	144
Total loans	3,477	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	289	927
Amortized Cost Basis by Origination Year 2023	1,469	795
Amortized Cost Basis by Origination Year 2022	744	235
Amortized Cost Basis by Origination Year 2021	440	363
Amortized Cost Basis by Origination Year, Prior to 2020	2,548	2,045
Revolving Loans	46	112
Revolving Loans Converted to Term	628	145
Total loans	6,164	4,622
Home Equity [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	2	355
Amortized Cost Basis by Origination Year 2023	221	132
Amortized Cost Basis by Origination Year 2022	170	65
Amortized Cost Basis by Origination Year 2021	98	35
Amortized Cost Basis by Origination Year, Prior to 2020	309	260
Revolving Loans	3	28
Revolving Loans Converted to Term	14	119
Total loans	817	994
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,600,210	7,326,681
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,333	8,478
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,728	8,148
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,258	23,641
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	107,385	201,454
Amortized Cost Basis by Origination Year 2024	221,459	195,340
Amortized Cost Basis by Origination Year 2023	289,689	324,426
Amortized Cost Basis by Origination Year 2022	765,574	398,043
Amortized Cost Basis by Origination Year 2021	656,626	168,767
Amortized Cost Basis by Origination Year, Prior to 2020	1,090,482	480,564
Revolving Loans Converted to Term	808,581	751,492
Total loans	3,939,796	2,520,086
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	107,301	201,454
Amortized Cost Basis by Origination Year 2024	219,631	195,121
Amortized Cost Basis by Origination Year 2023	285,658	323,588
Amortized Cost Basis by Origination Year 2022	758,553	397,596
Amortized Cost Basis by Origination Year 2021	651,602	168,526
Amortized Cost Basis by Origination Year, Prior to 2020	1,068,960	471,081
Revolving Loans Converted to Term	805,882	749,593
Total loans	3,897,587	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	0
Amortized Cost Basis by Origination Year 2021	0
Amortized Cost Basis by Origination Year, Prior to 2020	689	1,483
Revolving Loans Converted to Term	0
Total loans	689	1,483
Residential Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	84
Amortized Cost Basis by Origination Year 2024	1,101
Amortized Cost Basis by Origination Year 2023	2,335
Amortized Cost Basis by Origination Year 2022	3,827	319
Amortized Cost Basis by Origination Year 2021	2,806	37
Amortized Cost Basis by Origination Year, Prior to 2020	8,435	2,763
Revolving Loans Converted to Term	903	404
Total loans	19,491	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	727	219
Amortized Cost Basis by Origination Year 2023	1,696	838
Amortized Cost Basis by Origination Year 2022	3,194	128
Amortized Cost Basis by Origination Year 2021	2,218	204
Amortized Cost Basis by Origination Year, Prior to 2020	12,398	5,237
Revolving Loans Converted to Term	1,796	1,495
Total loans	22,029	8,121
Residential Real Estate [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2023	33
Amortized Cost Basis by Origination Year 2022	150
Amortized Cost Basis by Origination Year 2021	0
Amortized Cost Basis by Origination Year, Prior to 2020	158	250
Revolving Loans Converted to Term	71	58
Total loans	412	308
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	45,400	52,438
Amortized Cost Basis by Origination Year 2024	93,929	57,608
Amortized Cost Basis by Origination Year 2023	84,777	38,399
Amortized Cost Basis by Origination Year 2022	99,297	12,623
Amortized Cost Basis by Origination Year 2021	32,105	5,930
Amortized Cost Basis by Origination Year, Prior to 2020	33,401	9,589
Revolving Loans	28,113	24,688
Revolving Loans Converted to Term	168
Total loans	417,190	201,275
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	45,026	51,073
Amortized Cost Basis by Origination Year 2024	91,217	55,821
Amortized Cost Basis by Origination Year 2023	80,713	36,994
Amortized Cost Basis by Origination Year 2022	95,631	11,744
Amortized Cost Basis by Origination Year 2021	30,827	5,640
Amortized Cost Basis by Origination Year, Prior to 2020	31,865	9,270
Revolving Loans	27,621	24,540
Revolving Loans Converted to Term	131
Total loans	403,031	195,082
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	279	774
Amortized Cost Basis by Origination Year 2024	1,922	1,225
Amortized Cost Basis by Origination Year 2023	2,776	765
Amortized Cost Basis by Origination Year 2022	2,014	602
Amortized Cost Basis by Origination Year 2021	698	205
Amortized Cost Basis by Origination Year, Prior to 2020	893	197
Revolving Loans	492	148
Revolving Loans Converted to Term	24
Total loans	9,098	3,916
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	54	271
Amortized Cost Basis by Origination Year 2024	472	327
Amortized Cost Basis by Origination Year 2023	423	517
Amortized Cost Basis by Origination Year 2022	672	161
Amortized Cost Basis by Origination Year 2021	179	51
Amortized Cost Basis by Origination Year, Prior to 2020	269	57
Revolving Loans Converted to Term	13
Total loans	2,082	1,384
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	41	320
Amortized Cost Basis by Origination Year 2024	318	235
Amortized Cost Basis by Origination Year 2023	865	123
Amortized Cost Basis by Origination Year 2022	980	116
Amortized Cost Basis by Origination Year 2021	401	34
Amortized Cost Basis by Origination Year, Prior to 2020	374	65
Total loans	2,979	893
Consumer [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	22	382
Amortized Cost Basis by Origination Year 2024	1,113	1,578
Amortized Cost Basis by Origination Year 2023	599	1,466
Amortized Cost Basis by Origination Year 2022	889	497
Amortized Cost Basis by Origination Year 2021	392	166
Amortized Cost Basis by Origination Year, Prior to 2020	268	313
Total loans	3,283	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	110,325	247,445
Amortized Cost Basis by Origination Year 2024	393,928	403,923
Amortized Cost Basis by Origination Year 2023	482,784	250,786
Amortized Cost Basis by Origination Year 2022	347,363	84,527
Amortized Cost Basis by Origination Year 2021	35,606	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	91,801	52,499
Revolving Loans	147,765	145,408
Revolving Loans Converted to Term	122,516	146,179
Total loans	1,732,088	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	293	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	1,347
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	1,363
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	110,325	245,699
Amortized Cost Basis by Origination Year 2024	393,928	403,923
Amortized Cost Basis by Origination Year 2023	482,460	249,690
Amortized Cost Basis by Origination Year 2022	292,940	84,527
Amortized Cost Basis by Origination Year 2021	35,606	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	89,959	52,485
Revolving Loans	147,765	145,032
Revolving Loans Converted to Term	104,888	144,702
Total loans	1,657,871	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	0
Amortized Cost Basis by Origination Year 2023	0	1,096
Amortized Cost Basis by Origination Year 2022	54,423
Amortized Cost Basis by Origination Year 2021	0
Amortized Cost Basis by Origination Year, Prior to 2020	279	10
Revolving Loans	0	376
Revolving Loans Converted to Term	4,523	645
Total loans	59,225	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 2023	324
Amortized Cost Basis by Origination Year, Prior to 2020	1,563	4
Revolving Loans Converted to Term	13,105	832
Total loans	14,992	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	336,169	562,444
Amortized Cost Basis by Origination Year 2024	670,347	502,786
Amortized Cost Basis by Origination Year 2023	586,598	1,067,326
Amortized Cost Basis by Origination Year 2022	1,733,909	557,988
Amortized Cost Basis by Origination Year 2021	964,991	529,601
Amortized Cost Basis by Origination Year, Prior to 2020	3,356,597	1,973,937
Revolving Loans	296,176	202,020
Revolving Loans Converted to Term	923,335	578,496
Total loans	8,868,122	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	12,040	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	4,381	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	33,895	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	335,922	542,333
Amortized Cost Basis by Origination Year 2024	621,201	472,746
Amortized Cost Basis by Origination Year 2023	571,797	1,038,745
Amortized Cost Basis by Origination Year 2022	1,620,681	543,212
Amortized Cost Basis by Origination Year 2021	940,405	512,916
Amortized Cost Basis by Origination Year, Prior to 2020	3,260,353	1,897,950
Revolving Loans	265,490	200,572
Revolving Loans Converted to Term	797,497	482,132
Total loans	8,413,346	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	29,547	28,204
Amortized Cost Basis by Origination Year 2023	8,619	5,188
Amortized Cost Basis by Origination Year 2022	81,875	13,590
Amortized Cost Basis by Origination Year 2021	20,267	6,733
Amortized Cost Basis by Origination Year, Prior to 2020	60,615	39,845
Revolving Loans	30,414	825
Revolving Loans Converted to Term	120,233	94,572
Total loans	351,570	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	247	19,746
Amortized Cost Basis by Origination Year 2024	19,599	1,836
Amortized Cost Basis by Origination Year 2023	6,182	23,393
Amortized Cost Basis by Origination Year 2022	31,353	1,186
Amortized Cost Basis by Origination Year 2021	4,319	9,952
Amortized Cost Basis by Origination Year, Prior to 2020	35,629	36,142
Revolving Loans	272	623
Revolving Loans Converted to Term	5,605	1,792
Total loans	103,206	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 2021	9
Amortized Cost Basis by Origination Year, Prior to 2020	634	855
Revolving Loans Converted to Term	35
Total loans	678	937
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	147,332	227,055
Amortized Cost Basis by Origination Year 2024	292,159	147,177
Amortized Cost Basis by Origination Year 2023	204,680	210,747
Amortized Cost Basis by Origination Year 2022	385,671	108,592
Amortized Cost Basis by Origination Year 2021	218,150	49,947
Amortized Cost Basis by Origination Year, Prior to 2020	377,171	260,737
Revolving Loans	997,036	639,755
Revolving Loans Converted to Term	196,897	143,267
Total loans	2,819,096	1,787,277
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,068	957
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,313	8,872
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,513	4,616
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	147,257	225,344
Amortized Cost Basis by Origination Year 2024	274,552	139,460
Amortized Cost Basis by Origination Year 2023	198,899	206,252
Amortized Cost Basis by Origination Year 2022	373,138	106,446
Amortized Cost Basis by Origination Year 2021	207,269	48,285
Amortized Cost Basis by Origination Year, Prior to 2020	356,548	250,438
Revolving Loans	930,155	616,831
Revolving Loans Converted to Term	177,007	128,253
Total loans	2,664,825	1,721,309
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	46	217
Amortized Cost Basis by Origination Year 2024	14,014	7,335
Amortized Cost Basis by Origination Year 2023	5,193	3,337
Amortized Cost Basis by Origination Year 2022	9,072	921
Amortized Cost Basis by Origination Year 2021	8,863	1,597
Amortized Cost Basis by Origination Year, Prior to 2020	13,176	7,660
Revolving Loans	60,711	20,464
Revolving Loans Converted to Term	9,545	7,274
Total loans	120,620	48,805
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	29	1,494
Amortized Cost Basis by Origination Year 2024	3,593	382
Amortized Cost Basis by Origination Year 2023	588	1,158
Amortized Cost Basis by Origination Year 2022	3,461	1,225
Amortized Cost Basis by Origination Year 2021	2,018	65
Amortized Cost Basis by Origination Year, Prior to 2020	7,447	2,639
Revolving Loans	6,170	2,460
Revolving Loans Converted to Term	10,345	7,740
Total loans	33,651	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	477	648
Amortized Cost Basis by Origination Year 2023	548	1,048
Amortized Cost Basis by Origination Year 2022	880	228
Amortized Cost Basis by Origination Year 2021	479	162
Amortized Cost Basis by Origination Year, Prior to 2020	202	1,029
Revolving Loans	1,088	1
Revolving Loans Converted to Term	147	7,369
Total loans	$ 3,821	$ 10,533