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Loans Held-for-Investment and Allowance for Credit Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans $ 8,243,625 $ 7,913,098 $ 7,723,191
Less-Allowance for credit losses (105,958) (98,325) (99,936)
Net loans held-for-investment 8,137,667 7,814,773 7,623,255
C&I [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,174,770 1,176,993 1,175,774
Municipal [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 347,559 369,246 333,732
Construction & Development [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,214,649 1,054,603 1,013,810
Farm [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 322,710 339,665 315,720
Non-Owner Occupied CRE [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 802,675 805,566 825,928
Owner Occupied CRE [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,119,425 1,083,100 1,086,750
Residential [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 2,308,708 2,196,767 2,112,196
Auto [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 718,501 638,560 618,103
Non-Auto [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 145,808 153,055 157,909
Commercial [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,522,329 1,546,239 1,509,506
Commercial [Member] | C&I [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,174,770 1,176,993 1,175,774
Commercial [Member] | Municipal [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 347,559 369,246 333,732
Agriculture [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 88,820 95,543 83,269
Real Estate [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 5,768,167 5,479,701 5,354,404
Real Estate [Member] | Construction & Development [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,214,649 1,054,603 1,013,810
Real Estate [Member] | Farm [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 322,710 339,665 315,720
Real Estate [Member] | Non-Owner Occupied CRE [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 802,675 805,566 825,928
Real Estate [Member] | Owner Occupied CRE [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 1,119,425 1,083,100 1,086,750
Real Estate [Member] | Residential [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 2,308,708 2,196,767 2,112,196
Consumer [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 864,309 791,615 776,012
Net loans held-for-investment 8,137,667 7,814,773 7,623,255
Consumer [Member] | Auto [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans 718,501 638,560 618,103
Consumer [Member] | Non-Auto [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total Loans $ 145,808 $ 153,055 $ 157,909