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Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 8,180,361 | $ 7,656,645
Accruing Loans 90 Days or More Past Due | 4,628 | 9,542
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 939,520 | 960,944
Accruing Loans 90 Days or More Past Due | 171 | 4,377
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,632,472 | 1,486,420
Accruing Loans 90 Days or More Past Due | 524 | 913
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 713,138 | 642,643
Accruing Loans 90 Days or More Past Due | 282 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 262,101 | 283,486
Accruing Loans 90 Days or More Past Due | 548 | 332
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,395,163 | 1,258,744
Accruing Loans 90 Days or More Past Due | 916 | 731
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 271,598 | 244,696
Accruing Loans 90 Days or More Past Due | 238 | 549
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 428,012 | 427,139
Accruing Loans 90 Days or More Past Due | 1,191 | 579
Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,482,474 | 1,289,452
Accruing Loans 90 Days or More Past Due | 329 | 1,714
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 476,475 | 476,467
Accruing Loans 90 Days or More Past Due | 429 | 347
Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 579,408 | 586,654
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 17,754 | 16,429
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,856 | 1,386
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 68 | 2,224
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 304 | 198
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 635 | 1,542
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,482 | 3,879
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,299 | 757
30 to 59 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,796 | 1,694
30 to 59 Days Past Due [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,011 | 1,501
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,303 | 3,248
30 to 59 Days Past Due [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 0 |
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 17,001 | 11,405
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 9,208 | 26
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,686 | 7,371
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 107 | 158
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans |  | 206
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,967 | 1,204
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 356 | 190
60 to 89 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 331 | 724
60 to 89 Days Past Due [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,297 | 436
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 817 | 1,090
60 to 89 Days Past Due [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 232 |
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 39,878 | 22,992
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,803 | 5,598
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 952 | 1,786
90 Days and Greater [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 20,442 | 800
90 Days and Greater [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 827 | 405
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,990 | 1,849
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 901 | 613
90 Days and Greater [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,657 | 1,227
90 Days and Greater [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,496 | 10,028
90 Days and Greater [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 810 | 594
90 Days and Greater [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans |  | 92
Past Due Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 74,633 | 50,826
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 17,867 | 7,010
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,706 | 11,381
Past Due Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 20,853 | 1,156
Past Due Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,462 | 2,153
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 10,439 | 6,932
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,556 | 1,560
Past Due Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,784 | 3,645
Past Due Loans [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 9,804 | 11,965
Past Due Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,930 | 4,932
Past Due Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 232 | 92
Current Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,105,728 | 7,605,819
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 921,653 | 953,934
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,629,766 | 1,475,039
Current Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 692,285 | 641,487
Current Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 260,639 | 281,333
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,384,724 | 1,251,812
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 269,042 | 243,136
Current Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 424,228 | 423,494
Current Loans [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,472,670 | 1,277,487
Current Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 471,545 | 471,535
Current Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 579,176 | $ 586,562

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