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Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 252,958	$ 233,851	$ 229,923
Loans collectively evaluated for credit losses	7,990,667	7,679,247	7,493,268
Total Loans	8,243,625	7,913,098	7,723,191
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	39,546	29,762	25,237
Loans collectively evaluated for credit losses	1,135,224	1,147,231	1,150,537
Total Loans	1,174,770	1,176,993	1,175,774
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	9,300	409	373
Loans collectively evaluated for credit losses	338,259	368,837	333,359
Total Loans	347,559	369,246	333,732
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	16,270	11,174	10,021
Loans collectively evaluated for credit losses	1,198,379	1,043,429	1,003,789
Total Loans	1,214,649	1,054,603	1,013,810
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	9,641	10,588	10,324
Loans collectively evaluated for credit losses	313,069	329,077	305,396
Total Loans	322,710	339,665	315,720
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	36,786	39,894	38,394
Loans collectively evaluated for credit losses	765,889	765,672	787,534
Total Loans	802,675	805,566	825,928
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	72,582	79,470	86,775
Loans collectively evaluated for credit losses	1,046,843	1,003,630	999,975
Total Loans	1,119,425	1,083,100	1,086,750
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	61,996	53,659	51,180
Loans collectively evaluated for credit losses	2,246,712	2,143,108	2,061,016
Total Loans	2,308,708	2,196,767	2,112,196
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,423	3,579	3,108
Loans collectively evaluated for credit losses	715,078	634,981	614,995
Total Loans	718,501	638,560	618,103
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	975	1,105	1,273
Loans collectively evaluated for credit losses	144,833	151,950	156,636
Total Loans	145,808	153,055	157,909
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,439	4,211	3,238
Loans collectively evaluated for credit losses	86,381	91,332	80,031
Total Loans	88,820	95,543	83,269
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	197,275	194,785	196,694
Total Loans	5,768,167	5,479,701	5,354,404
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	16,270	11,174	10,021
Total Loans	1,214,649	1,054,603	1,013,810
Real Estate [Member] | Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	9,641	10,588	10,324
Total Loans	322,710	339,665	315,720
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	36,786	39,894	38,394
Total Loans	802,675	805,566	825,928
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	72,582	79,470	86,775
Total Loans	1,119,425	1,083,100	1,086,750
Real Estate [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	61,996	53,659	51,180
Total Loans	2,308,708	2,196,767	2,112,196
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	4,398	4,684	4,381
Total Loans	864,309	791,615	776,012
Consumer [Member] | Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,423	3,579	3,108
Total Loans	718,501	638,560	618,103
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	975	1,105	1,273
Total Loans	$ 145,808	$ 153,055	$ 157,909

X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreement.

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