Loans Held-for-Investment and Allowance for Credit Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 7,945,611	$ 7,913,098	$ 7,229,410
Less-Allowance for credit losses	(101,080)	(98,325)	(89,562)
Net loans held-for-investment	7,844,531	7,814,773	7,139,848
C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,144,429	1,176,993	1,191,516
Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	338,303	369,246	211,013
Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,098,069	1,054,603	921,773
Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	331,464	339,665	311,002
Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	753,898	805,566	853,721
Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,142,618	1,083,100	1,032,845
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	2,217,740	2,196,767	1,918,573
Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	679,189	638,560	549,837
Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	149,715	153,055	151,248
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,482,732	1,546,239	1,402,529
Commercial [Member] | C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,144,429	1,176,993	1,191,516
Commercial [Member] | Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	338,303	369,246	211,013
Agriculture [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	90,186	95,543	87,882
Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	5,543,789	5,479,701	5,037,914
Real Estate [Member] | Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,098,069	1,054,603	921,773
Real Estate [Member] | Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	331,464	339,665	311,002
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	753,898	805,566	853,721
Real Estate [Member] | Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,142,618	1,083,100	1,032,845
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	2,217,740	2,196,767	1,918,573
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	828,904	791,615	701,085
Net loans held-for-investment	7,844,531	7,814,773	7,139,848
Consumer [Member] | Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	679,189	638,560	549,837
Consumer [Member] | Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 149,715	$ 153,055	$ 151,248