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Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	$ 252,958	$ 233,851	$ 229,923
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	26,381	22,817	24,892
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	26,334	15,454	9,696
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	30,060	46,484	53,682
Related Allowance on Collateral Dependent Loans	7,303	10,260	11,946
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	19,078	12,557	12,946
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	196,564	171,913	166,545
C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	39,546	29,762	25,237
Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,300	409	373
Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	16,270	11,174	10,021
Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,641	10,588	10,324
Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	36,786	39,894	38,394
Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	72,582	79,470	86,775
Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	61,996	53,659	51,180
Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,423	3,579	3,108
Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	975	1,105	1,273
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	48,846	30,171	25,610
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	8,486	4,505	5,351
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	350	854	1,137
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	3,377	3,130	2,815
Related Allowance on Collateral Dependent Loans	968	1,463	1,430
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	7,518	3,042	3,921
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	45,119	26,187	21,658
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	39,546	29,762	25,237
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	8,334	4,505	5,351
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	350	854	1,137
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	3,360	3,130	2,815
Related Allowance on Collateral Dependent Loans	968	1,463	1,430
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	7,366	3,042	3,921
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	35,836	25,778	21,285
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,300	409	373
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	152	0	0
Commercial [Member] | Municipal [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0	0	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	17	0	0
Related Allowance on Collateral Dependent Loans	0	0	0
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	152	0	0
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	9,283	409	373
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	2,439	4,211	3,238
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	511	1,165	1,728
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	273	743	278
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,586	466	1,810
Related Allowance on Collateral Dependent Loans	283	220	1,092
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	228	945	636
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	580	3,002	1,150
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	197,275	194,785	196,694
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	17,373	17,017	17,643
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	25,711	13,857	8,281
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	23,938	41,944	48,013
Related Allowance on Collateral Dependent Loans	6,049	8,525	9,336
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	11,324	8,492	8,307
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	147,626	138,984	140,400
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	16,270	11,174	10,021
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	1,777	491	591
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	281	732	1,091
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,552	409	526
Related Allowance on Collateral Dependent Loans	210	26	35
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	1,567	465	556
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	14,437	10,033	8,404
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,641	10,588	10,324
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	237	450	989
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	4,498	412	412
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	238	3,764	4,326
Related Allowance on Collateral Dependent Loans	6	23	546
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	231	427	443
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	4,905	6,412	5,586
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	36,786	39,894	38,394
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	4,285	4,258	3,449
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	1,306	6,668	2,234
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,190	4,394	10,553
Related Allowance on Collateral Dependent Loans	425	1,406	1,402
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	3,860	2,852	2,047
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	34,290	28,832	25,607
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	72,582	79,470	86,775
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	7,081	8,158	9,597
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	15,818	2,186	402
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	12,657	27,888	29,009
Related Allowance on Collateral Dependent Loans	4,389	5,727	6,709
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,692	2,431	2,888
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	44,107	49,396	57,364
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	61,996	53,659	51,180
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3,993	3,660	3,017
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	3,808	3,859	4,142
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	8,301	5,489	3,599
Related Allowance on Collateral Dependent Loans	1,019	1,343	644
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,974	2,317	2,373
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	49,887	44,311	43,439
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	4,398	4,684	4,381
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	11	130	170
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0	0	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,159	944	1,044
Related Allowance on Collateral Dependent Loans	3	52	88
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	8	78	82
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	3,239	3,740	3,337
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,423	3,579	3,108
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	8	6	5
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0	0	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	955	638	546
Related Allowance on Collateral Dependent Loans	2	1	1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	6	5	4
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	2,468	2,941	2,562
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	975	1,105	1,273
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3	124	165
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0	0	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	204	306	498
Related Allowance on Collateral Dependent Loans	1	51	87
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2	73	78
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	$ 771	$ 799	$ 775

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