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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period $ 99,626 $ 96,920 $ 96,800 $ 92,728
Charge- offs (1,086) (1,730) (6,154) (3,012)
Recoveries 311 274 832 602
Net charge-offs (775) (1,456) (5,322) (2,410)
Provision for/(benefit from) credit losses 3,031 2,312 10,404 7,458
Balance at end of period 101,882 97,776 101,882 97,776
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 7,370 6,808 7,483 6,416
Charge- offs   (805) (15) (853)
Recoveries 46 3 77 55
Net charge-offs 46 (802) 62 (798)
Provision for/(benefit from) credit losses (8) 809 (137) 1,197
Balance at end of period 7,408 6,815 7,408 6,815
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 33,867 33,432 33,080 30,190
Charge- offs (189)   (203) (3)
Recoveries 94   94 0
Net charge-offs (95)   (109) (3)
Provision for/(benefit from) credit losses (26) 1,182 775 4,427
Balance at end of period 33,746 34,614 33,746 34,614
Real Estate [Member] | Construction and Development Less than 60 Months [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 6,780 3,440 3,950 3,778
Charge- offs   0   (4)
Recoveries   3   9
Net charge-offs   3   5
Provision for/(benefit from) credit losses 1,575 467 4,405 127
Balance at end of period 8,355 3,910 8,355 3,910
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 3,519 3,553 3,414 3,275
Charge- offs     (3)  
Net charge-offs     (3)  
Provision for/(benefit from) credit losses (178) (9) (70) 269
Balance at end of period 3,341 3,544 3,341 3,544
Real Estate [Member] | Residential Real Estate First Lien [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 5,572 4,755 4,914 4,092
Charge- offs (85) (100) (175) (144)
Recoveries 0 0 25 13
Net charge-offs (85) (100) (150) (131)
Provision for/(benefit from) credit losses 159 109 882 803
Balance at end of period 5,646 4,764 5,646 4,764
Real Estate [Member] | Residential Real Estate All Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 1,729 1,661 1,646 1,418
Charge- offs (50) 0 (79) (28)
Recoveries 3 1 11 4
Net charge-offs (47) 1 (68) (24)
Provision for/(benefit from) credit losses 55 3 159 271
Balance at end of period 1,737 1,665 1,737 1,665
Commercial Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 21,475 25,127 22,745 25,106
Charge- offs (298) (239) (4,132) (517)
Recoveries 100 243 413 392
Net charge-offs (198) 4 (3,719) (125)
Provision for/(benefit from) credit losses 983 (886) 3,234 (736)
Balance at end of period 22,260 24,245 22,260 24,245
Consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 4,383 4,344 4,401 4,132
Charge- offs (431) (427) (1,372) (965)
Recoveries 50 24 177 116
Net charge-offs (381) (403) (1,195) (849)
Provision for/(benefit from) credit losses 378 448 1,174 1,106
Balance at end of period 4,380 4,389 4,380 4,389
Oil and Gas [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 9,014 7,374 9,030 8,104
Charge- offs   0 (92) (2)
Net charge-offs   0 (92) (2)
Provision for/(benefit from) credit losses 78 23 154 (705)
Balance at end of period 9,092 7,397 9,092 7,397
Agriculture [Member] | Real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 5,917 6,426 6,137 6,217
Charge- offs (33) (159) (83) (496)
Recoveries 18 0 35 13
Net charge-offs (15) (159) (48) (483)
Provision for/(benefit from) credit losses 15 166 (172) 699
Balance at end of period $ 5,917 $ 6,433 $ 5,917 $ 6,433