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Acquisitions - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2023 Office | Jun. 30, 2024 Centers | Dec. 31, 2024 USD ($) Location shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of bank operating locations | Location |  |  | 283 |  |  |  |  |
Total assets |  |  | $ 39,566,738 | $ 38,547,877 |  |  |  |
Loans |  |  | 21,797,404 | 20,848,176 |  |  |  |
Total deposits |  |  | 28,381,338 | 27,179,809 |  |  |  |
Shareholders’ equity |  |  | 7,438,495 | 7,079,330 | $ 6,699,374 |  |  | $ 6,427,236
Goodwill |  |  | 3,503,129 | 3,396,086 | 3,231,636 |  |  |
Core deposit intangibles, net |  |  | 66,047 | 63,994 | 51,348 |  |  |
Merger-related expenses |  |  | $ 4,444 | 15,133 | $ 272 |  |  |
West Texas [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of bank operating locations | Location |  |  | 44 |  |  |  |  |
First Bancshares of Texas, Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | $ 2,140,000 |
Loans |  |  |  |  |  |  | 1,650,000 |
Total deposits |  |  |  |  |  |  | $ 1,710,000 |
Business acquisition, equity interest issued or issuable, number of shares | shares |  |  | 3,583,370 |  |  |  |  |
Payments to acquire businesses in cash |  |  | $ 91,500 |  |  |  |  |
Goodwill |  |  | 164,800 |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  | $ 25,322 |  |  |  |
Core deposit intangibles, net |  |  | $ 23,500 |  |  |  |  |
First Bancshares of Texas, Inc. [Member] | West North and Central Texas [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of full-service banking offices | Office | 16 |  |  |  |  |  |  |
Lone Star State Bancshares Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  | $ 1,380,000 |  |
Loans |  |  |  |  |  | 1,070,000 |  |
Total deposits |  |  |  |  |  | $ 1,240,000 |  |
Business acquisition, equity interest issued or issuable, number of shares | shares |  |  | 2,376,182 |  |  |  |  |
Payments to acquire businesses in cash |  |  | $ 64,100 |  |  |  |  |
Goodwill |  |  | 106,700 |  |  |  |  |
Core deposit intangibles, net |  |  | $ 17,700 |  |  |  |  |
Lone Star State Bancshares Inc [Member] | West Texas [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of full-service banking offices | Centers |  | 5 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 10 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 15 years |  |  |  |  |

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