Loans Held for Investment and Allowance for Loan Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 63,378	$ 33,609	$ 38,812
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,952	4,132	3,365
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,952	4,132	3,365
Commercial [Member] | Muncipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	0	0	0
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	2,088	155	838
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	56,294	28,741	34,038
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,617	1,444	3,295
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	4,738	4,804	5,534
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	12,787	8,022	8,407
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	29,411	6,822	7,812
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	7,741	7,649	8,990
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,044	581	571
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	546	464	465
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	$ 498	$ 117	$ 106