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Loans Held for Investment and Allowance for Credit Losses on Loans - Collateral-dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | $ 8,180,361 |  | $ 7,656,645 |  |  |
Specific Allocation | 101,882 | $ 99,626 | 96,800 | $ 97,776 | $ 96,920 | $ 92,728
Real Estate Asset [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 24,442 |  | 4,240 |  |  |
Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,939 |  | 6,683 |  |  |
Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 526 |  | 403 |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 28,907 |  | 11,326 |  |  |
Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 6,547 |  | 4,152 |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 939,520 |  | 960,944 |  |  |
Specific Allocation | 7,408 | 7,370 | 7,483 | 6,815 | 6,808 | 6,416
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 1,632,472 |  | 1,486,420 |  |  |
Specific Allocation | 33,746 | 33,867 | 33,080 | 34,614 | 33,432 | 30,190
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 713,138 |  | 642,643 |  |  |
Specific Allocation | 8,355 | 6,780 | 3,950 | 3,910 | 3,440 | 3,778
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 262,101 |  | 283,486 |  |  |
Specific Allocation | 3,341 | 3,519 | 3,414 | 3,544 | 3,553 | 3,275
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 1,395,163 |  | 1,258,744 |  |  |
Specific Allocation | 5,646 | 5,572 | 4,914 | 4,764 | 4,755 | 4,092
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 271,598 |  | 244,696 |  |  |
Specific Allocation | 1,737 | 1,729 | 1,646 | 1,665 | 1,661 | 1,418
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 2,018 |  | 632 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 20,141 |  | 800 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 279 |  | 638 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 90 |  | 189 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 136 |  | 140 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 1,778 |  | 1,841 |  |  |
Real Estate [Member] | Business Assets [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 192 |  | 593 |  |  |
Real Estate [Member] | Other Assets [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 14 |  | 15 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 2,018 |  | 632 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 20,141 |  | 800 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 279 |  | 638 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 90 |  | 189 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 136 |  | 140 |  |  |
Real Estate [Member] | Collateral Pledged [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 1,984 |  | 2,449 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 24 |  | 250 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 3,755 |  | 225 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 89 |  | 134 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 39 |  | 62 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 69 |  | 140 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 983 |  | 1,386 |  |  |
Commercial Non-real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 1,482,474 |  | 1,289,452 |  |  |
Specific Allocation | 22,260 | 21,475 | 22,745 | 24,245 | 25,127 | 25,106
Commercial Non-real Estate [Member] | Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,747 |  | 6,090 |  |  |
Commercial Non-real Estate [Member] | Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 186 |  | 241 |  |  |
Commercial Non-real Estate [Member] | Collateral Pledged [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,933 |  | 6,331 |  |  |
Commercial Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 1,327 |  | 1,867 |  |  |
Consumer Non-real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 476,475 |  | 476,467 |  |  |
Specific Allocation | 4,380 | $ 4,383 | 4,401 | $ 4,389 | $ 4,344 | $ 4,132
Consumer Non-real Estate [Member] | Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 326 |  | 147 |  |  |
Consumer Non-real Estate [Member] | Collateral Pledged [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 326 |  | 147 |  |  |
Consumer Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | $ 261 |  | $ 88 |  |  |

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