Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 63,142	$ 61,938	$ 60,311
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,108	3,984	4,080
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,091	3,984	4,080
Commercial [Member] | Muncipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	17	0	0
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	2,434	1,209	2,028
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	56,557	55,801	53,183
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,269	1,141	1,679
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	5,171	4,176	4,299
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	9,707	11,062	9,615
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	27,337	30,074	31,606
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	11,073	9,348	5,984
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,043	944	1,020
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	833	638	710
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	$ 210	$ 306	$ 310