Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 60,430	$ 61,938	$ 36,157
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	4,209	3,984	3,950
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	4,192	3,984	3,950
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	351	1,209	2,043
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	54,730	55,801	29,350
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,778	1,141	1,976
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	4,638	4,176	4,597
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	10,548	11,062	9,243
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	28,954	30,074	5,719
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	8,812	9,348	7,815
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,140	944	814
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	795	638	486
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	$ 345	$ 306	$ 328