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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 | Jun. 30, 2024 | Dec. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 8,047,448 | $ 7,656,645
Accruing Loans 90 Days or More Past Due | 4,280 | 9,542
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 954,942 | 960,944
Accruing Loans 90 Days or More Past Due | 532 | 4,377
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,604,132 | 1,486,420
Accruing Loans 90 Days or More Past Due | 803 | 913
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 680,807 | 642,643
Accruing Loans 90 Days or More Past Due | 31 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 288,900 | 283,486
Accruing Loans 90 Days or More Past Due |  | 332
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,335,124 | 1,258,744
Accruing Loans 90 Days or More Past Due | 961 | 731
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 260,036 | 244,696
Accruing Loans 90 Days or More Past Due | 250 | 549
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 432,360 | 427,139
Accruing Loans 90 Days or More Past Due | 916 | 579
Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,436,349 | 1,289,452
Accruing Loans 90 Days or More Past Due | 587 | 1,714
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 469,084 | 476,467
Accruing Loans 90 Days or More Past Due | 200 | 347
Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 585,714 | 586,654
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 16,865 | 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 | 3,020 | 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 | 0 | 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 | 405 | 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 | 229 | 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 | 4,929 | 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 | 866 | 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 | 1,805 | 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 | 1,857 | 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 | 3,166 | 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 | 588 |
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,069 | 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 | 38 | 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 | 141 | 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 | 1,738 | 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 | 117 | 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 | 2,144 | 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 | 152 | 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 | 937 | 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 | 831 | 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 | 555 | 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 | 416 |
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 18,407 | 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 | 5,379 | 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 | 1,544 | 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 | 831 | 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 | 407 | 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 | 2,213 | 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 | 835 | 613
90 Days and Greater [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,447 | 1,227
90 Days and Greater [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,256 | 10,028
90 Days and Greater [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 495 | 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 | 42,341 | 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 | 8,437 | 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 | 1,685 | 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 | 2,974 | 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 | 753 | 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 | 9,286 | 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 | 1,853 | 1,560
Past Due Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,189 | 3,645
Past Due Loans [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,944 | 11,965
Past Due Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,216 | 4,932
Past Due Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,004 | 92
Current Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,005,107 | 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 | 946,505 | 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 | 1,602,447 | 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 | 677,833 | 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 | 288,147 | 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 | 1,325,838 | 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 | 258,183 | 243,136
Current Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 428,171 | 423,494
Current Loans [Member] | Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,428,405 | 1,277,487
Current Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 464,868 | 471,535
Current Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 584,710 | $ 586,562

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