Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	$ 257,065	$ 233,851	$ 219,263
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	24,534	22,817	22,310
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	30,258	15,454	10,351
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	32,884	46,484	49,960
Related Allowance on Collateral Dependent Loans	8,474	10,260	9,704
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	16,060	12,557	12,606
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	193,923	171,913	158,952
C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	40,809	29,762	42,542
Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,451	409	559
Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	16,620	11,174	26,681
Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,321	10,588	9,795
Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	40,126	39,894	30,496
Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	73,014	79,470	67,453
Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	59,112	53,659	34,643
Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,621	3,579	3,083
Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	1,038	1,105	1,015
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	50,260	30,171	43,101
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	7,319	4,505	4,830
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	115	854	1,070
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	2,993	3,130	3,010
Related Allowance on Collateral Dependent Loans	896	1,463	1,166
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	6,423	3,042	3,664
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	47,152	26,187	39,021
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	40,809	29,762	42,542
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	7,157	4,505	4,830
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	115	854	1,070
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	2,976	3,130	3,010
Related Allowance on Collateral Dependent Loans	896	1,463	1,166
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	6,261	3,042	3,664
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	37,718	25,778	38,462
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	9,451	409	559
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	162	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	162	0	0
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	9,434	409	559
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	2,953	4,211	2,996
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	512	1,165	1,405
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	474	743	714
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,960	466	1,314
Related Allowance on Collateral Dependent Loans	340	220	1,025
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	172	945	380
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	519	3,002	968
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	199,193	194,785	169,068
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	16,692	17,017	15,950
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	29,669	13,857	8,567
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	26,888	41,944	44,616
Related Allowance on Collateral Dependent Loans	7,235	8,525	7,447
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	9,457	8,492	8,503
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	142,636	138,984	115,885
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	16,620	11,174	26,681
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	1,440	491	1,808
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	1,767	732	1,104
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	1,502	409	575
Related Allowance on Collateral Dependent Loans	190	26	57
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	1,250	465	1,751
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	13,351	10,033	25,002
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	10,321	10,588	9,795
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	562	450	883
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	1,190	412	0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	3,981	3,764	4,299
Related Allowance on Collateral Dependent Loans	282	23	429
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	280	427	454
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	5,150	6,412	5,496
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	40,126	39,894	30,496
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3,973	4,258	2,927
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	7,052	6,668	2,327
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	2,655	4,394	7,288
Related Allowance on Collateral Dependent Loans	1,117	1,406	1,150
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,856	2,852	1,777
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	30,419	28,832	20,881
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	73,014	79,470	67,453
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	6,912	8,158	8,584
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	16,259	2,186	2,316
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	11,078	27,888	29,290
Related Allowance on Collateral Dependent Loans	4,562	5,727	5,566
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,350	2,431	3,018
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	45,677	49,396	35,847
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	59,112	53,659	34,643
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3,805	3,660	1,748
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss	3,401	3,859	2,820
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss	7,672	5,489	3,164
Related Allowance on Collateral Dependent Loans	1,084	1,343	245
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2,721	2,317	1,503
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	48,039	44,311	28,659
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	4,659	4,684	4,098
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	11	130	125
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	1,043	944	1,020
Related Allowance on Collateral Dependent Loans	3	52	66
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	8	78	59
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	3,616	3,740	3,078
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	3,621	3,579	3,083
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	8	6	6
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	833	638	710
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	5
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	2,788	2,941	2,373
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Total Loans Individually Evaluated for Credit Losses	1,038	1,105	1,015
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses	3	124	119
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	210	306	310
Related Allowance on Collateral Dependent Loans	1	51	65
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance On Non Collateral Dependent Loans	2	73	54
Non Collateral Dependent Loans Individually Evaluated for Credit Losses	$ 828	$ 799	$ 705