Loans Held for Investment and Allowance for Loan Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Related Allowance	$ 22,310	$ 19,216	$ 17,573
Average Recorded Investment	219,263	175,139	176,213
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	10,351	15,877	12,626
Recorded Investment With Allowance	49,960	12,795	20,983
Related Allowance	9,704	3,832	3,791
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	12,606	15,384	13,782
Average Recorded Investment	158,952	146,467	142,604
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,830	8,451	5,858
Average Recorded Investment	43,101	29,607	23,498
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	1,070	610	1,322
Recorded Investment With Allowance	3,010	4,208	2,810
Related Allowance	1,166	2,780	1,363
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,664	5,671	4,495
Average Recorded Investment	39,021	24,789	19,366
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,830	8,451	5,858
Average Recorded Investment	42,542	28,100	22,765
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	1,070	610	1,322
Recorded Investment With Allowance	3,010	4,208	2,810
Related Allowance	1,166	2,780	1,363
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,664	5,671	4,495
Average Recorded Investment	38,462	23,282	18,633
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0
Average Recorded Investment	559	1,507	733
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		1,507	733
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,405	554	750
Average Recorded Investment	2,996	1,988	1,459
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	714	0	57
Recorded Investment With Allowance	1,314	133	98
Related Allowance	1,025	37	50
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	380	517	700
Average Recorded Investment	968	1,855	1,304
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	15,950	10,207	10,901
Average Recorded Investment	169,068	140,672	147,768
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	8,567	15,238	11,247
Recorded Investment With Allowance	44,616	7,704	17,494
Related Allowance	7,447	1,014	2,377
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	8,503	9,193	8,524
Average Recorded Investment	115,885	117,730	119,027
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,808	2,209	2,401
Average Recorded Investment	26,681	24,622	23,989
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	1,104	2,672	758
Recorded Investment With Allowance	575	163	686
Related Allowance	57	15	148
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,751	2,194	2,253
Average Recorded Investment	25,002	21,787	22,545
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	883	1,135	994
Average Recorded Investment	9,795	7,739	6,166
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0	578
Recorded Investment With Allowance	4,299	123	4,804
Related Allowance	429	18	937
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	454	1,117	57
Average Recorded Investment	5,496	7,038	1,362
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,927	2,923	3,684
Average Recorded Investment	30,496	32,441	37,139
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,327	2,062	1,919
Recorded Investment With Allowance	7,288	3,267	6,103
Related Allowance	1,150	421	700
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,777	2,502	2,984
Average Recorded Investment	20,881	27,112	29,117
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	8,584	2,068	1,663
Average Recorded Investment	67,453	39,178	42,568
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,316	5,643	4,661
Recorded Investment With Allowance	29,290	1,665	2,161
Related Allowance	5,566	299	232
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,018	1,769	1,431
Average Recorded Investment	35,847	31,870	35,746
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,748	1,872	2,159
Average Recorded Investment	34,643	36,692	37,906
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,820	4,283	3,909
Recorded Investment With Allowance	3,164	2,486	3,740
Related Allowance	245	261	360
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,503	1,611	1,799
Average Recorded Investment	28,659	29,923	30,257
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	125	4	64
Average Recorded Investment	4,098	2,872	3,488
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0	29
Recorded Investment With Allowance	1,020	750	581
Related Allowance	66	1	1
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	59	3	63
Average Recorded Investment	3,078	2,093	2,907
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	6	3	4
Average Recorded Investment	3,083	2,220	2,589
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0	29
Recorded Investment With Allowance	710	620	464
Related Allowance	1	1	1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5	2	3
Average Recorded Investment	2,373	1,571	2,125
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	119	1	60
Average Recorded Investment	1,015	652	899
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	310	130	117
Related Allowance	65
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	54	1	60
Average Recorded Investment	$ 705	$ 522	$ 782