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Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period $ 96,800 $ 92,728  
Charge- offs (7,346) (4,240)  
Recoveries 1,039 854  
Net charge-offs (6,307) (3,386)  
Provision for/(benefit from) credit losses 9,004 7,458 $ 10,076
Balance at end of period 99,497 96,800 92,728
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 7,483 6,416  
Charge- offs (15) (922)  
Recoveries 85 68  
Net charge-offs 70 (854)  
Provision for/(benefit from) credit losses (684) 1,921  
Balance at end of period 6,869 7,483 6,416
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 33,080 30,190  
Charge- offs (236) (3)  
Recoveries 94    
Net charge-offs (142) (3)  
Provision for/(benefit from) credit losses 159 2,893  
Balance at end of period 33,097 33,080 30,190
Real Estate [Member] | Construction and Development Less than 60 Months [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 3,950 3,778  
Charge- offs   (6)  
Recoveries   11  
Net charge-offs   5  
Provision for/(benefit from) credit losses 4,721 167  
Balance at end of period 8,671 3,950 3,778
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 3,414 3,275  
Charge- offs (3) (94)  
Net charge-offs (3) (94)  
Provision for/(benefit from) credit losses (1,075) 233  
Balance at end of period 2,336 3,414 3,275
Real Estate [Member] | Residential Real Estate First Lien [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 4,914 4,092  
Charge- offs (255) (165)  
Recoveries 26 15  
Net charge-offs (229) (150)  
Provision for/(benefit from) credit losses (117) 972  
Balance at end of period 4,568 4,914 4,092
Real Estate [Member] | Residential Real Estate All Other [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 1,646 1,418  
Charge- offs (171) (60)  
Recoveries 12 5  
Net charge-offs (159) (55)  
Provision for/(benefit from) credit losses 254 283  
Balance at end of period 1,741 1,646 1,418
Commercial Non-real Estate [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 22,745 25,106  
Charge- offs (4,494) (1,085)  
Recoveries 542 446  
Net charge-offs (3,952) (639)  
Provision for/(benefit from) credit losses 5,357 (1,722)  
Balance at end of period 24,150 22,745 25,106
Consumer Non-real Estate [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 4,401 4,132  
Charge- offs (1,914) (1,350)  
Recoveries 237 182  
Net charge-offs (1,677) (1,168)  
Provision for/(benefit from) credit losses 2,109 1,437  
Balance at end of period 4,833 4,401 4,132
Oil and Gas [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 9,030 8,104  
Charge- offs (92) (59)  
Net charge-offs (92) (59)  
Provision for/(benefit from) credit losses (1,402) 985  
Balance at end of period 7,536 9,030 8,104
Agriculture [Member] | Real Estate [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Balance at beginning of period 6,137 6,217  
Charge- offs (166) (496)  
Recoveries 43 127  
Net charge-offs (123) (369)  
Provision for/(benefit from) credit losses (318) 289  
Balance at end of period $ 5,696 $ 6,137 $ 6,217