Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	$ 245,612	$ 233,851	$ 201,587
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	24,009	22,817	19,077
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	25,985	15,454	11,453
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	34,445	46,484	24,704
Related Allowance on Collateral Dependent Loans	9,501	10,260	5,301
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	14,508	12,557	13,776
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	185,182	171,913	165,430
C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	28,547	29,762	41,454
Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,601	409	559
Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,327	11,174	30,929
Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,936	10,588	6,533
Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	39,726	39,894	31,655
Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	78,640	79,470	41,179
Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	59,382	53,659	39,271
Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,828	3,579	2,828
Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	1,191	1,105	1,092
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	38,148	30,171	42,013
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	4,987	4,505	5,711
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	117	854	756
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	4,092	3,130	3,194
Related Allowance on Collateral Dependent Loans	1,545	1,463	1,541
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	3,442	3,042	4,170
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	33,939	26,187	38,063
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	28,547	29,762	41,454
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	4,815	4,505	5,711
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	117	854	756
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	4,075	3,130	3,194
Related Allowance on Collateral Dependent Loans	1,545	1,463	1,541
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	3,270	3,042	4,170
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	24,355	25,778	37,504
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,601	409	559
Related Allowance On Non Collateral Dependent Loans	172
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	172
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	9,584
Commercial [Member] | Municipal [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	17
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Non Collateral Dependent Loans Individually Evaluated for Credit Losses		409	559
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,434	4,211	6,087
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	1,110	1,165	2,730
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0	743	713
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	351	466	1,330
Related Allowance on Collateral Dependent Loans	113	220	849
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	997	945	1,881
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	3,083	3,002	4,044
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	199,011	194,785	149,567
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	17,902	17,017	10,502
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	25,868	13,857	9,984
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	28,862	41,944	19,366
Related Allowance on Collateral Dependent Loans	7,841	8,525	2,838
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	10,061	8,492	7,664
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	144,281	138,984	120,217
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,327	11,174	30,929
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	498	491	2,243
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	487	732	903
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,291	409	1,073
Related Allowance on Collateral Dependent Loans	62	26	189
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	436	465	2,054
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	8,549	10,033	28,953
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,936	10,588	6,533
Related Allowance on Collateral Dependent Loans	348
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses		450	758
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	747	412	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	3,891	3,764	4,597
Related Allowance on Collateral Dependent Loans	27	23	727
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance on Collateral Dependent Loans	321
Related Allowance On Non Collateral Dependent Loans		427	31
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	6,298	6,412	1,936
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	39,726	39,894	31,655
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	5,628	4,258	3,007
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	6,494	6,668	1,850
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	4,054	4,394	7,393
Related Allowance on Collateral Dependent Loans	1,620	1,406	1,235
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	4,008	2,852	1,772
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	29,178	28,832	22,412
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	78,640	79,470	41,179
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	7,322	8,158	2,238
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	16,831	2,186	2,827
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	12,123	27,888	2,892
Related Allowance on Collateral Dependent Loans	4,953	5,727	445
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,369	2,431	1,793
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	49,686	49,396	35,460
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	59,382	53,659	39,271
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	4,106	3,660	2,256
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	1,309	3,859	4,404
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	7,503	5,489	3,411
Related Allowance on Collateral Dependent Loans	1,179	1,343	242
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,927	2,317	2,014
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	50,570	44,311	31,456
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	5,019	4,684	3,920
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	10	130	134
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0		0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,140	944	814
Related Allowance on Collateral Dependent Loans	2	52	73
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	8	78	61
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	3,879	3,740	3,106
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,828	3,579	2,828
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	7	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
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	795	638	486
Related Allowance on Collateral Dependent Loans	1	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	3,033	2,941	2,342
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	1,191	1,105	1,092
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3	124	129
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	345	306	328
Related Allowance on Collateral Dependent Loans	1	51	72
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2	73	57
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	$ 846	$ 799	$ 764