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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	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 18,932,074	$ 12,656,429
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	47,493	22,254
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,865	24,970
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	86,125	41,893
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	13,304	11,504
Amortized Cost Basis by Origination Year 2024	5,585	3,607
Amortized Cost Basis by Origination Year 2023	5,411	4,715
Amortized Cost Basis by Origination Year 2022	5,308	1,615
Amortized Cost Basis by Origination Year 2021	2,692	3,074
Amortized Cost Basis by Origination Year, Prior to 2020	28,547	26,351
Revolving Loans	1,012,104	768,526
Revolving Loans Converted to Term	18,685	1,718
Total loans	1,091,636	821,110
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	13,279	11,504
Amortized Cost Basis by Origination Year 2024	3,578	1,857
Amortized Cost Basis by Origination Year 2023	2,295	2,220
Amortized Cost Basis by Origination Year 2022	2,804	969
Amortized Cost Basis by Origination Year 2021	1,801	2,623
Amortized Cost Basis by Origination Year, Prior to 2020	23,175	22,444
Revolving Loans	1,005,803	763,157
Revolving Loans Converted to Term	17,428	1,251
Total loans	1,070,163	806,025
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	693	167
Amortized Cost Basis by Origination Year 2023	610	530
Amortized Cost Basis by Origination Year 2022	890	65
Amortized Cost Basis by Origination Year 2021	178	88
Amortized Cost Basis by Origination Year, Prior to 2020	1,706	1,226
Revolving Loans	6,169	5,166
Revolving Loans Converted to Term	244	178
Total loans	10,490	7,420
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	25
Amortized Cost Basis by Origination Year 2024	758	656
Amortized Cost Basis by Origination Year 2023	1,043	1,170
Amortized Cost Basis by Origination Year 2022	738	346
Amortized Cost Basis by Origination Year 2021	174	0
Amortized Cost Basis by Origination Year, Prior to 2020	1,174	636
Revolving Loans	108	91
Revolving Loans Converted to Term	513	144
Total loans	4,533	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	556	927
Amortized Cost Basis by Origination Year 2023	1,463	795
Amortized Cost Basis by Origination Year 2022	876	235
Amortized Cost Basis by Origination Year 2021	539	363
Amortized Cost Basis by Origination Year, Prior to 2020	2,492	2,045
Revolving Loans	24	112
Revolving Loans Converted to Term	500	145
Total loans	6,450	4,622
Home Equity [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2024	21	355
Amortized Cost Basis by Origination Year 2023	440	132
Amortized Cost Basis by Origination Year 2022	322	65
Amortized Cost Basis by Origination Year 2021	98	35
Amortized Cost Basis by Origination Year, Prior to 2020	334	260
Revolving Loans	42	28
Revolving Loans Converted to Term	14	119
Total loans	1,271	994
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,755,370	7,326,681
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,119	8,478
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,900	8,148
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,198	23,641
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	191,466	201,454
Amortized Cost Basis by Origination Year 2024	196,704	195,340
Amortized Cost Basis by Origination Year 2023	269,249	324,426
Amortized Cost Basis by Origination Year 2022	746,010	398,043
Amortized Cost Basis by Origination Year 2021	640,618	168,767
Amortized Cost Basis by Origination Year, Prior to 2020	1,054,365	480,564
Revolving Loans Converted to Term	830,057	751,492
Total loans	3,928,469	2,520,086
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	190,965	201,454
Amortized Cost Basis by Origination Year 2024	194,660	195,121
Amortized Cost Basis by Origination Year 2023	264,926	323,588
Amortized Cost Basis by Origination Year 2022	737,854	397,596
Amortized Cost Basis by Origination Year 2021	634,654	168,526
Amortized Cost Basis by Origination Year, Prior to 2020	1,033,050	471,081
Revolving Loans Converted to Term	824,991	749,593
Total loans	3,881,100	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, Prior to 2020	1,257	1,483
Total loans	1,257	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	417
Amortized Cost Basis by Origination Year 2024	887
Amortized Cost Basis by Origination Year 2023	1,246
Amortized Cost Basis by Origination Year 2022	3,104	319
Amortized Cost Basis by Origination Year 2021	2,844	37
Amortized Cost Basis by Origination Year, Prior to 2020	7,639	2,763
Revolving Loans Converted to Term	2,779	404
Total loans	18,916	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 2025	84
Amortized Cost Basis by Origination Year 2024	1,157	219
Amortized Cost Basis by Origination Year 2023	3,077	838
Amortized Cost Basis by Origination Year 2022	5,052	128
Amortized Cost Basis by Origination Year 2021	3,120	204
Amortized Cost Basis by Origination Year, Prior to 2020	12,419	5,237
Revolving Loans Converted to Term	2,287	1,495
Total loans	27,196	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	10
Amortized Cost Basis by Origination Year 2023	118
Amortized Cost Basis by Origination Year 2022	452
Amortized Cost Basis by Origination Year, Prior to 2020	211	250
Revolving Loans Converted to Term	71	58
Total loans	862	308
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	50,961	52,438
Amortized Cost Basis by Origination Year 2024	84,614	57,608
Amortized Cost Basis by Origination Year 2023	75,916	38,399
Amortized Cost Basis by Origination Year 2022	87,483	12,623
Amortized Cost Basis by Origination Year 2021	28,298	5,930
Amortized Cost Basis by Origination Year, Prior to 2020	29,124	9,589
Revolving Loans	28,132	24,688
Revolving Loans Converted to Term	165
Total loans	384,693	201,275
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	50,608	51,073
Amortized Cost Basis by Origination Year 2024	82,620	55,821
Amortized Cost Basis by Origination Year 2023	73,158	36,994
Amortized Cost Basis by Origination Year 2022	84,699	11,744
Amortized Cost Basis by Origination Year 2021	27,349	5,640
Amortized Cost Basis by Origination Year, Prior to 2020	28,068	9,270
Revolving Loans	28,036	24,540
Revolving Loans Converted to Term	156
Total loans	374,694	195,082
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	221	774
Amortized Cost Basis by Origination Year 2024	1,342	1,225
Amortized Cost Basis by Origination Year 2023	1,348	765
Amortized Cost Basis by Origination Year 2022	1,473	602
Amortized Cost Basis by Origination Year 2021	535	205
Amortized Cost Basis by Origination Year, Prior to 2020	407	197
Revolving Loans	96	148
Revolving Loans Converted to Term	9
Total loans	5,431	3,916
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	98	271
Amortized Cost Basis by Origination Year 2024	405	327
Amortized Cost Basis by Origination Year 2023	803	517
Amortized Cost Basis by Origination Year 2022	572	161
Amortized Cost Basis by Origination Year 2021	205	51
Amortized Cost Basis by Origination Year, Prior to 2020	266	57
Total loans	2,349	1,384
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	34	320
Amortized Cost Basis by Origination Year 2024	247	235
Amortized Cost Basis by Origination Year 2023	607	123
Amortized Cost Basis by Origination Year 2022	739	116
Amortized Cost Basis by Origination Year 2021	209	34
Amortized Cost Basis by Origination Year, Prior to 2020	383	65
Total loans	2,219	893
Consumer [Member] | Current-period gross charge-offs [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	148	382
Amortized Cost Basis by Origination Year 2024	1,901	1,578
Amortized Cost Basis by Origination Year 2023	1,277	1,466
Amortized Cost Basis by Origination Year 2022	1,820	497
Amortized Cost Basis by Origination Year 2021	717	166
Amortized Cost Basis by Origination Year, Prior to 2020	470	313
Total loans	6,333	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	211,110	247,445
Amortized Cost Basis by Origination Year 2024	445,490	403,923
Amortized Cost Basis by Origination Year 2023	436,855	250,786
Amortized Cost Basis by Origination Year 2022	251,929	84,527
Amortized Cost Basis by Origination Year 2021	35,339	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	86,077	52,499
Revolving Loans	158,773	145,408
Revolving Loans Converted to Term	201,069	146,179
Total loans	1,826,642	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	369	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	1,413
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	4,358
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	211,110	245,699
Amortized Cost Basis by Origination Year 2024	445,490	403,923
Amortized Cost Basis by Origination Year 2023	436,531	249,690
Amortized Cost Basis by Origination Year 2022	212,730	84,527
Amortized Cost Basis by Origination Year 2021	35,339	21,316
Amortized Cost Basis by Origination Year, Prior to 2020	84,050	52,485
Revolving Loans	158,773	145,032
Revolving Loans Converted to Term	184,291	144,702
Total loans	1,768,314	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	39,199
Amortized Cost Basis by Origination Year 2021	0
Amortized Cost Basis by Origination Year, Prior to 2020	528	10
Revolving Loans	0	376
Revolving Loans Converted to Term	3,704	645
Total loans	43,431	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	1,499	4
Revolving Loans Converted to Term	13,074	832
Total loans	14,897	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	613,790	562,444
Amortized Cost Basis by Origination Year 2024	623,734	502,786
Amortized Cost Basis by Origination Year 2023	575,941	1,067,326
Amortized Cost Basis by Origination Year 2022	1,674,127	557,988
Amortized Cost Basis by Origination Year 2021	947,921	529,601
Amortized Cost Basis by Origination Year, Prior to 2020	3,228,782	1,973,937
Revolving Loans	260,696	202,020
Revolving Loans Converted to Term	1,003,737	578,496
Total loans	8,928,728	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	7,750	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	11,487	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	25,840	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	613,548	542,333
Amortized Cost Basis by Origination Year 2024	573,398	472,746
Amortized Cost Basis by Origination Year 2023	557,706	1,038,745
Amortized Cost Basis by Origination Year 2022	1,588,969	543,212
Amortized Cost Basis by Origination Year 2021	923,346	512,916
Amortized Cost Basis by Origination Year, Prior to 2020	3,120,180	1,897,950
Revolving Loans	230,102	200,572
Revolving Loans Converted to Term	900,674	482,132
Total loans	8,507,923	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	30,812	28,204
Amortized Cost Basis by Origination Year 2023	12,040	5,188
Amortized Cost Basis by Origination Year 2022	47,668	13,590
Amortized Cost Basis by Origination Year 2021	20,426	6,733
Amortized Cost Basis by Origination Year, Prior to 2020	70,982	39,845
Revolving Loans	30,170	825
Revolving Loans Converted to Term	91,987	94,572
Total loans	304,085	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	242	19,746
Amortized Cost Basis by Origination Year 2024	19,524	1,836
Amortized Cost Basis by Origination Year 2023	6,195	23,393
Amortized Cost Basis by Origination Year 2022	37,490	1,186
Amortized Cost Basis by Origination Year 2021	4,149	9,952
Amortized Cost Basis by Origination Year, Prior to 2020	37,620	36,142
Revolving Loans	424	623
Revolving Loans Converted to Term	11,076	1,792
Total loans	116,720	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	112	75
Amortized Cost Basis by Origination Year 2022		7
Amortized Cost Basis by Origination Year 2021	142
Amortized Cost Basis by Origination Year, Prior to 2020	4,209	855
Revolving Loans Converted to Term	35
Total loans	4,498	937
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	262,244	227,055
Amortized Cost Basis by Origination Year 2024	263,118	147,177
Amortized Cost Basis by Origination Year 2023	188,636	210,747
Amortized Cost Basis by Origination Year 2022	360,973	108,592
Amortized Cost Basis by Origination Year 2021	198,474	49,947
Amortized Cost Basis by Origination Year, Prior to 2020	343,940	260,737
Revolving Loans	964,482	639,755
Revolving Loans Converted to Term	190,039	143,267
Total loans	2,771,906	1,787,277
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,196	957
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,167	8,872
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	20,062	4,616
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	262,085	225,344
Amortized Cost Basis by Origination Year 2024	246,645	139,460
Amortized Cost Basis by Origination Year 2023	180,396	206,252
Amortized Cost Basis by Origination Year 2022	348,792	106,446
Amortized Cost Basis by Origination Year 2021	190,032	48,285
Amortized Cost Basis by Origination Year, Prior to 2020	325,939	250,438
Revolving Loans	912,743	616,831
Revolving Loans Converted to Term	175,439	128,253
Total loans	2,642,071	1,721,309
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	131	217
Amortized Cost Basis by Origination Year 2024	12,063	7,335
Amortized Cost Basis by Origination Year 2023	4,774	3,337
Amortized Cost Basis by Origination Year 2022	8,366	921
Amortized Cost Basis by Origination Year 2021	5,099	1,597
Amortized Cost Basis by Origination Year, Prior to 2020	6,544	7,660
Revolving Loans	43,354	20,464
Revolving Loans Converted to Term	5,473	7,274
Total loans	85,804	48,805
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2025	28	1,494
Amortized Cost Basis by Origination Year 2024	4,410	382
Amortized Cost Basis by Origination Year 2023	3,466	1,158
Amortized Cost Basis by Origination Year 2022	3,815	1,225
Amortized Cost Basis by Origination Year 2021	3,343	65
Amortized Cost Basis by Origination Year, Prior to 2020	11,457	2,639
Revolving Loans	8,385	2,460
Revolving Loans Converted to Term	9,127	7,740
Total loans	44,031	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	592	648
Amortized Cost Basis by Origination Year 2023	670	1,048
Amortized Cost Basis by Origination Year 2022	1,009	228
Amortized Cost Basis by Origination Year 2021	545	162
Amortized Cost Basis by Origination Year, Prior to 2020	885	1,029
Revolving Loans	1,088	1
Revolving Loans Converted to Term	1,178	7,369
Total loans	$ 5,967	$ 10,533

X

- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
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- Definition

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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- Definition

Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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X

- Definition

Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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