Loans and ACL - Summary of Recorded Investment of Loans Held for Investment by Internal Loan Grade by Year of Origination Quarterly (Detail) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 97,473	$ 58,252
2024	39,224	181,865
2023	133,620	740,853
2022	644,821	323,241
2021	283,797	260,534
Prior	524,489	340,307
Revolving Loans	188,104	205,703
Total	1,911,528	2,110,755
Current period gross charge-offs	9,164
Current period gross charge-offs 2025	156
Current period gross charge-offs 2024	728
Current period gross charge-offs 2023	624
Current period gross charge-offs 2022	6,782
Current period gross charge-offs 2021	439
Current period gross charge-offs prior	278
Current period gross charge-offs revolving	157
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	18,120	15,499
2024	9,256	40,237
2023	14,000	107,206
2022	73,399	35,345
2021	27,620	23,150
Prior	29,356	17,987
Revolving Loans	104,858	115,480
Total	276,609	354,904
Current period gross charge-offs	6,442
Current period gross charge-offs 2024	346
Current period gross charge-offs 2023	368
Current period gross charge-offs 2022	5,505
Current period gross charge-offs 2021	12
Current period gross charge-offs prior	161
Current period gross charge-offs revolving	50
Construction, Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	13,795	6,219
2024	5,497	7,483
2023	3,269	65,560
2022	32,029	15,367
2021	4,359	10,175
Prior	14,468	9,288
Revolving Loans	56	399
Total	73,473	114,491
Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	16,112	19,767
2024	10,066	9,030
2023	519	7,992
2022	3,728	13,971
2021	20,094
Prior	73	57
Revolving Loans	300	990
Total	50,892	51,807
Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	40,542	6,847
2024	6,622	39,790
2023	33,176	320,210
2022	313,702	137,196
2021	120,917	159,760
Prior	280,883	158,507
Revolving Loans	22,259	25,532
Total	818,101	847,842
Current period gross charge-offs	437
Current period gross charge-offs 2021	374
Current period gross charge-offs prior	63
Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,128	3,668
2024	3,515	67,516
2023	70,150	229,615
2022	214,531	118,090
2021	108,529	66,320
Prior	197,166	151,202
Revolving Loans	55,011	55,842
Total	654,030	692,253
Current period gross charge-offs	215
Current period gross charge-offs 2023	65
Current period gross charge-offs prior	43
Current period gross charge-offs revolving	107
Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	62	147
2024	144	135
2023	126	997
2022	990	1,339
2021	1,293
Prior	1,883	2,753
Revolving Loans	147	149
Total	4,645	5,520
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	3,714	6,105
2024	4,124	17,674
2023	12,380	9,273
2022	6,442	1,933
2021	985	1,129
Prior	660	513
Revolving Loans	5,473	7,311
Total	33,778	43,938
Current period gross charge-offs	2,070
Current period gross charge-offs 2025	156
Current period gross charge-offs 2024	382
Current period gross charge-offs 2023	191
Current period gross charge-offs 2022	1,277
Current period gross charge-offs 2021	53
Current period gross charge-offs prior	11
Risk Grades 1 - 4
Financing Receivable, Credit Quality Indicator [Line Items]
2025	95,102	53,329
2024	36,105	147,386
2023	124,446	618,362
2022	495,048	272,353
2021	226,516	230,603
Prior	448,580	300,706
Revolving Loans	175,624	182,509
Total	1,601,421	1,805,248
Risk Grades 1 - 4 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	17,449	13,883
2024	8,903	13,559
2023	11,166	64,530
2022	45,179	14,600
2021	10,938	17,405
Prior	23,464	15,760
Revolving Loans	98,045	98,867
Total	215,144	238,604
Risk Grades 1 - 4 \| Construction, Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	13,619	6,219
2024	5,497	6,277
2023	2,191	65,560
2022	32,029	7,776
2021	3,660	5,405
Prior	4,332	4,792
Revolving Loans	56	399
Total	61,384	96,428
Risk Grades 1 - 4 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	15,774	19,574
2024	10,066	8,861
2023	519	7,837
2022	75	13,971
2021	94
Prior	73	57
Revolving Loans	300	990
Total	26,901	51,290
Risk Grades 1 - 4 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	40,542	4,747
2024	4,554	34,698
2023	29,808	245,563
2022	200,617	118,435
2021	103,935	142,211
Prior	232,286	133,856
Revolving Loans	17,397	21,323
Total	629,139	700,833
Risk Grades 1 - 4 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	4,004	2,815
2024	3,062	66,780
2023	68,780	225,159
2022	210,258	114,682
2021	105,871	64,548
Prior	185,953	143,002
Revolving Loans	54,206	53,498
Total	632,134	670,484
Risk Grades 1 - 4 \| Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		147
2024	144
2023		997
2022	990	1,239
2021	1,198
Prior	1,883	2,753
Revolving Loans	147	149
Total	4,362	5,285
Risk Grades 1 - 4 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	3,714	5,944
2024	3,879	17,211
2023	11,982	8,716
2022	5,900	1,650
2021	820	1,034
Prior	589	486
Revolving Loans	5,473	7,283
Total	32,357	42,324
Risk Grades 5 - 6
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,052	2,327
2024	1,521	30,880
2023	6,033	104,708
2022	109,415	26,264
2021	34,504	24,907
Prior	67,443	30,699
Revolving Loans	10,117	19,371
Total	231,085	239,156
Risk Grades 5 - 6 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	671	672
2024	353	24,430
2023	1,030	37,503
2022	23,518	10,201
2021	3,881	5,183
Prior	4,013	979
Revolving Loans	5,046	15,092
Total	38,512	94,060
Risk Grades 5 - 6 \| Construction, Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	176
2024		1,090
2023	1,078
2022		7,567
2021	690	4,770
Prior	10,136	4,235
Total	12,080	17,662
Risk Grades 5 - 6 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	338	193
2022	3,186
2021	20,000
Total	23,524	193
Risk Grades 5 - 6 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		535
2024	513	5,092
2023	3,368	64,677
2022	81,731	7,002
2021	8,416	14,604
Prior	47,878	23,104
Revolving Loans	4,862	4,184
Total	146,768	119,198
Risk Grades 5 - 6 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	805	853
2024	453
2023	266	2,303
2022	781	1,295
2021	1,394	318
Prior	5,390	2,378
Revolving Loans	209	95
Total	9,298	7,242
Risk Grades 5 - 6 \| Farmland [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	62
2024		135
2023	126
2022		100
2021	95
Total	283	235
Risk Grades 5 - 6 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		74
2024	202	133
2023	165	225
2022	199	99
2021	28	32
Prior	26	3
Total	620	566
Risk Grade 7
Financing Receivable, Credit Quality Indicator [Line Items]
2025	319	2,596
2024	1,598	3,599
2023	3,141	17,783
2022	40,358	23,163
2021	22,777	5,024
Prior	8,466	8,709
Revolving Loans	2,363	3,823
Total	79,022	64,697
Risk Grade 7 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		944
2024		2,248
2023	1,804	5,173
2022	4,702	10,462
2021	12,801	562
Prior	1,879	1,247
Revolving Loans	1,767	1,521
Total	22,953	22,157
Risk Grade 7 \| Construction, Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		116
2022		24
2021	9
Prior		261
Total	9	401
Risk Grade 7 \| Construction, Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		169
2023		155
2022	467
Total	467	324
Risk Grade 7 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		1,565
2024	1,555
2023		9,970
2022	31,354	10,380
2021	8,566	2,945
Prior	719	1,355
Revolving Loans		25
Total	42,194	26,240
Risk Grade 7 \| Residential [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	319
2024		736
2023	1,104	2,153
2022	3,492	2,113
2021	1,264	1,454
Prior	5,823	5,822
Revolving Loans	596	2,249
Total	12,598	14,527
Risk Grade 7 \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025		87
2024	43	330
2023	233	332
2022	343	184
2021	137	63
Prior	45	24
Revolving Loans		28
Total	$ 801	1,048
Risk Grade 8
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,461
Prior		193
Total		1,654
Risk Grade 8 \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		82
Prior		1
Total		83
Risk Grade 8 \| Commercial [Member] \| Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,379
Prior		192
Total		$ 1,571

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