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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | $ 7,656,645 | $ 6,943,563
Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 427,139 | 408,037
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 7,656,645 | 6,943,563
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 960,944 | 908,494
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 1,486,420 | 1,383,150
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 642,643 | 475,236
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 283,486 | 303,305
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 1,258,744 | 1,117,899
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 244,696 | 196,198
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 427,139 | 408,037
Commercial Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 1,289,452 | 1,241,454
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | 476,467 | 446,756
Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans held for investment (net of unearned interest) | $ 586,654 | $ 463,034

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