Loans and Allowance For Credit Losses - Summary of Investment in Loans by Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	$ 9,587	$ 138,590
2023/2022	129,949	349,647
2022/2021	338,914	305,746
2021/2020	301,006	101,007
2020/2019	98,308	90,206
Prior	316,867	241,132
Revolving	326,260	333,205
Total	1,520,891	1,559,533
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	2,575	87,167
2023/2022	80,545	151,113
2022/2021	142,303	59,038
2021/2020	56,147	16,130
2020/2019	14,879	28,657
Prior	59,497	35,553
Revolving	254,513	248,957
Total	610,459	626,615
Real estate - other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	6,979	44,570
2023/2022	41,701	186,142
2022/2021	190,970	221,147
2021/2020	221,826	84,708
2020/2019	83,281	60,581
Prior	220,193	168,403
Revolving	69,193	83,755
Total	834,143	849,306
Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		6,853
2023/2022	7,675	10,134
2022/2021	3,535	25,544
2021/2020	23,033
Prior	1,643	1,655
Total	35,886	44,186
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		747
2022/2021	734	17
2020/2019		968
Prior	3,083	2,192
Revolving	102	108
Total	3,919	4,032
Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	33
2023/2022	28	1,511
2022/2021	1,372
2021/2020		169
2020/2019	148	0
Prior	32,451	33,329
Revolving	2,452	385
Total	36,484	35,394
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	9,587	134,844
2023/2022	126,192	330,766
2022/2021	324,224	267,482
2021/2020	247,716	100,394
2020/2019	97,809	86,473
Prior	303,737	230,519
Revolving	284,723	290,285
Total	1,393,988	1,440,763
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	2,575	86,292
2023/2022	79,677	136,525
2022/2021	131,880	55,779
2021/2020	51,887	15,517
2020/2019	14,380	27,484
Prior	58,129	35,217
Revolving	212,976	206,037
Total	551,504	562,851
Pass [Member] | Real estate - other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	6,979	44,570
2023/2022	41,701	181,849
2022/2021	186,703	186,142
2021/2020	187,023	84,708
2020/2019	83,281	58,419
Prior	210,914	160,252
Revolving	69,193	83,755
Total	785,794	799,695
Pass [Member] | Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		3,982
2023/2022	4,786	10,134
2022/2021	3,535	25,544
2021/2020	8,806
Total	17,127	39,660
Pass [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		747
2022/2021	734	17
2020/2019		570
Prior	2,243	1,721
Revolving	102	108
Total	3,079	3,163
Pass [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023	33
2023/2022	28	1,511
2022/2021	1,372
2021/2020		169
2020/2019	148	0
Prior	32,451	33,329
Revolving	2,452	385
Total	36,484	35,394
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		2,995
2023/2022	117	7,993
2022/2021	4,517	35,296
2021/2020	49,207	502
2020/2019	442	2,305
Prior	5,162	4,013
Revolving	22,159	24,048
Total	81,604	77,152
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		124
2023/2022	117	3,700
2022/2021	250	1,940
2021/2020	1,815	502
2020/2019	442	730
Prior	937	336
Revolving	22,159	24,048
Total	25,720	31,380
Special Mention [Member] | Real estate - other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		4,293
2022/2021	4,267	33,356
2021/2020	33,165
2020/2019		1,575
Prior	4,137	3,575
Total	41,569	42,799
Special Mention [Member] | Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		2,871
2021/2020	14,227
Total	14,227	2,871
Special Mention [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	88	102
Total	88	102
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		751
2023/2022	3,640	10,888
2022/2021	10,173	2,968
2021/2020	4,083	111
2020/2019	57	1,428
Prior	7,968	6,600
Revolving	19,378	18,872
Total	45,299	41,618
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024/2023		751
2023/2022	751	10,888
2022/2021	10,173	1,319
2021/2020	2,445	111
2020/2019	57	443
Prior	431
Revolving	19,378	18,872
Total	33,235	32,384
Substandard [Member] | Real estate - other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021		1,649
2021/2020	1,638
2020/2019		587
Prior	5,142	4,576
Total	6,780	6,812
Substandard [Member] | Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	2,889
Prior	1,643	1,655
Total	4,532	1,655
Substandard [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020/2019		398
Prior	752	369
Total	752	767
Current period gross charge-offs [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		136
Prior	439	20
Revolving		247
Total	439	403
Current period gross charge-offs [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		136
Prior		20
Revolving		247
Total		$ 403
Current period gross charge-offs [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	309
Total	309
Current period gross charge-offs [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	130
Total	$ 130