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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
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period $ 99,497 $ 96,800
Charge- offs (783) (3,691)
Recoveries 280 143
Net charge-offs (503) (3,548)
Provision for/(benefit from) credit losses 1,461 4,015
Balance at end of period 100,455 97,267
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 6,869 7,483
Charge- offs (23) (15)
Recoveries 39 20
Net charge-offs 16 5
Provision for/(benefit from) credit losses 106 (20)
Balance at end of period 6,991 7,468
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 33,097 33,080
Charge- offs   (13)
Net charge-offs   (13)
Provision for/(benefit from) credit losses 656 113
Balance at end of period 33,753 33,180
Real Estate [Member] | Construction and Development Less than 60 Months [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 8,671 3,950
Charge- offs (3)  
Net charge-offs (3)  
Provision for/(benefit from) credit losses (55) 2,646
Balance at end of period 8,613 6,596
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 2,336 3,414
Charge- offs (25) (3)
Net charge-offs (25) (3)
Provision for/(benefit from) credit losses (29) 53
Balance at end of period 2,282 3,464
Real Estate [Member] | Residential Real Estate First Lien [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 4,568 4,914
Charge- offs (51) (23)
Recoveries 3 4
Net charge-offs (48) (19)
Provision for/(benefit from) credit losses 146 28
Balance at end of period 4,666 4,923
Real Estate [Member] | Residential Real Estate All Other [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 1,741 1,646
Charge- offs (6) (29)
Recoveries 21 5
Net charge-offs 15 (24)
Provision for/(benefit from) credit losses 34 30
Balance at end of period 1,790 1,652
Commercial Non-real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 24,150 22,745
Charge- offs (201) (3,054)
Recoveries 125 33
Net charge-offs (76) (3,021)
Provision for/(benefit from) credit losses (197) 758
Balance at end of period 23,877 20,482
Consumer Non-real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 4,833 4,401
Charge- offs (447) (431)
Recoveries 81 69
Net charge-offs (366) (362)
Provision for/(benefit from) credit losses 353 296
Balance at end of period 4,820 4,335
Oil and Gas [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 7,536 9,030
Charge- offs   (92)
Net charge-offs   (92)
Provision for/(benefit from) credit losses 351 92
Balance at end of period 7,887 9,030
Agriculture [Member] | Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 5,696 6,137
Charge- offs (27) (31)
Recoveries 11 12
Net charge-offs (16) (19)
Provision for/(benefit from) credit losses 96 19
Balance at end of period $ 5,776 $ 6,137