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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period $ 96,988 $ 99,626 $ 99,497 $ 96,800
Charge- offs (2,139) (1,086) (7,988) (6,154)
Recoveries 440 311 1,080 832
Net charge-offs (1,699) (775) (6,908) (5,322)
Provision for/(benefit from) credit losses 4,222 3,031 6,922 10,404
Balance at end of period 99,511 101,882 99,511 101,882
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 7,248 7,370 6,869 7,483
Charge- offs (29)   (110) (15)
Recoveries 100 46 141 77
Net charge-offs 71 46 31 62
Provision for/(benefit from) credit losses 212 (8) 631 (137)
Balance at end of period 7,531 7,408 7,531 7,408
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 35,217 33,867 33,097 33,080
Charge- offs (1,006) (189) (1,234) (203)
Recoveries   94   94
Net charge-offs (1,006) (95) (1,234) (109)
Provision for/(benefit from) credit losses 1,268 (26) 3,616 775
Balance at end of period 35,479 33,746 35,479 33,746
Real Estate [Member] | Construction and Development Less than 60 Months [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 4,907 6,780 8,671 3,950
Charge- offs     (3,744)  
Recoveries     6  
Net charge-offs     (3,738)  
Provision for/(benefit from) credit losses (77) 1,575 (103) 4,405
Balance at end of period 4,830 8,355 4,830 8,355
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 2,265 3,519 2,336 3,414
Charge- offs     (25) (3)
Recoveries     3  
Net charge-offs     (22) (3)
Provision for/(benefit from) credit losses 262 (178) 213 (70)
Balance at end of period 2,527 3,341 2,527 3,341
Real Estate [Member] | Residential Real Estate First Lien [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 4,645 5,572 4,568 4,914
Charge- offs (48) (85) (104) (175)
Recoveries 10   22 25
Net charge-offs (38) (85) (82) (150)
Provision for/(benefit from) credit losses 162 159 283 882
Balance at end of period 4,769 5,646 4,769 5,646
Real Estate [Member] | Residential Real Estate All Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 1,821 1,729 1,741 1,646
Charge- offs (50) (50) (63) (79)
Recoveries 28 3 49 11
Net charge-offs (22) (47) (14) (68)
Provision for/(benefit from) credit losses 208 55 280 159
Balance at end of period 2,007 1,737 2,007 1,737
Real Estate [Member] | Agriculture [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 5,131 5,917 5,696 6,137
Charge- offs (7) (33) (41) (83)
Recoveries 12 18 30 35
Net charge-offs 5 (15) (11) (48)
Provision for/(benefit from) credit losses (10) 15 (559) (172)
Balance at end of period 5,126 5,917 5,126 5,917
Commercial Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 24,047 21,475 24,150 22,745
Charge- offs (254) (298) (981) (4,132)
Recoveries 176 100 551 413
Net charge-offs (78) (198) (430) (3,719)
Provision for/(benefit from) credit losses 920 983 1,169 3,234
Balance at end of period 24,889 22,260 24,889 22,260
Consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 4,837 4,383 4,833 4,401
Charge- offs (745) (431) (1,686) (1,372)
Recoveries 114 50 278 177
Net charge-offs (631) (381) (1,408) (1,195)
Provision for/(benefit from) credit losses 891 378 1,672 1,174
Balance at end of period 5,097 4,380 5,097 4,380
Oil and Gas [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 6,870 9,014 7,536 9,030
Charge- offs       (92)
Net charge-offs       (92)
Provision for/(benefit from) credit losses 386 78 (280) 154
Balance at end of period $ 7,256 $ 9,092 $ 7,256 $ 9,092