Loans And Allowance For Credit Losses - Loans Held-for-Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	$ 7,913,098	$ 7,148,791
Less - allowance for credit losses	(98,325)	(88,734)
Net loans held-for-investment	7,814,773	7,060,057
Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,546,239	1,379,661
Agricultural [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	95,543	84,890
Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	5,479,701	5,007,955
Consumer [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	791,615	676,285
C&I [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,176,993	1,164,811
C&I [Member] | Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,176,993	1,164,811
Muncipal [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	369,246	214,850
Muncipal [Member] | Commercial [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	369,246	214,850
Construction & Development [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,054,603	963,158
Construction & Development [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,054,603	963,158
Farm [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	339,665	344,954
Farm [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	339,665	344,954
Non - Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	805,566	827,969
Non - Owner Occupied CRE [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	805,566	827,969
Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,083,100	1,037,281
Owner Occupied CRE [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	1,083,100	1,037,281
Residential [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	2,196,767	1,834,593
Residential [Member] | Real Estate [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	2,196,767	1,834,593
Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	638,560	521,859
Auto [Member] | Consumer [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	638,560	521,859
Non - Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	153,055	154,426
Non - Auto [Member] | Consumer [Member]
Loans And Leases Receivable Disclosure [Line Items]
Total Loans	$ 153,055	$ 154,426