Loans Held for Investment and Allowance for Loan Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 7,519,733	$ 7,148,791	$ 6,777,570
Less-allowance for credit losses	(95,170)	(88,734)	(86,541)
Net loans held-for-investment	7,424,563	7,060,057	6,691,029
C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,141,990	1,164,811	1,021,863
Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	359,124	214,850	215,977
Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	986,394	963,158	915,221
Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	318,597	344,954	335,644
Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	815,713	827,969	811,347
Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,049,715	1,037,281	1,011,511
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,990,604	1,834,593	1,698,679
Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	615,192	521,859	534,603
Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	156,218	154,426	150,693
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,501,114	1,379,661	1,237,840
Commercial [Member] | C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,141,990	1,164,811	1,021,863
Commercial [Member] | Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	359,124	214,850	215,977
Agriculture [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	86,186	84,890	82,032
Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	5,161,023	5,007,955	4,772,402
Real Estate [Member] | Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	986,394	963,158	915,221
Real Estate [Member] | Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	318,597	344,954	335,644
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	815,713	827,969	811,347
Real Estate [Member] | Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,049,715	1,037,281	1,011,511
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,990,604	1,834,593	1,698,679
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	771,410	676,285	685,296
Net loans held-for-investment	7,424,563	7,060,057	6,691,029
Consumer [Member] | Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	615,192	521,859	534,603
Consumer [Member] | Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 156,218	$ 154,426	$ 150,693