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Acquisitions - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 18, 2025 BankingOffices LoanProductionOffices shares | Jul. 16, 2025 USD ($) $ / shares | Apr. 01, 2024 Centers | Sep. 30, 2025 USD ($) shares | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 3,503,127 |  | $ 3,503,129 |  | $ 3,396,086
Core deposit intangibles |  |  |  | 55,194 |  | 66,047 |  | $ 63,994
Total assets |  |  |  | 38,330,469 |  | 39,566,738 |  |
Loans |  |  |  | 21,688,143 |  | 21,797,404 |  |
Total deposits |  |  |  | $ 27,782,094 |  | $ 28,381,338 |  |
Lone Star State Bancshares Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
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 |  |  |  | $ 17,700 |  |  |  |
Total assets |  |  |  |  |  |  | $ 1,380,000 |
Loans |  |  |  |  |  |  | 1,080,000 |
Total deposits |  |  |  |  |  |  | $ 1,240,000 |
Lone Star State Bancshares Inc [Member] | West Texas [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of full-service banking offices | Centers |  |  | 5 |  |  |  |  |
American Bank Holding Corporation [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, number of shares | shares | 4,439,981 |  |  |  |  |  |  |
Number of banking offices | BankingOffices | 18 |  |  |  |  |  |  |
Total assets |  |  |  |  | $ 2,550,000 |  |  |
Loans |  |  |  |  | 1,800,000 |  |  |
Total deposits |  |  |  |  | 2,290,000 |  |  |
Number of loan production offices | LoanProductionOffices | 2 |  |  |  |  |  |  |
Closing price | $ / shares |  | $ 72.4 |  |  |  |  |  |
Total consideration |  | $ 321,500 |  |  |  |  |  |
Southwest Bancshares Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  |  | 2,350,000 |  |  |
Loans |  |  |  |  | 1,890,000 |  |  |
Total deposits |  |  |  |  | $ 2,130,000 |  |  |

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