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Mergers and Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  | $ 1,411,711 | $ 1,411,711 | $ 988,898 | $ 988,898 | $ 991,665
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] |  |  |  |  |  |
Goodwill |  |  | $ 422,813 | $ 0 |  |
The First |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 263,352 |  |  |  |  |
Securities | 1,528,975 |  |  |  |  |
Loans, including loans held for sale | 5,327,056 |  |  |  |  |
Premises and equipment | 174,770 |  |  |  |  |
Bank-owned life insurance | 146,601 |  |  |  |  |
Other real estate owned | 8,413 |  |  |  |  |
Core deposit intangible | 56,899 |  |  |  |  |
Other assets | 169,500 |  |  |  |  |
Total assets | 7,675,566 |  |  |  |  |
Deposits | 6,456,784 |  |  |  |  |
Borrowings | 422,067 |  |  |  |  |
Other liabilities | 75,760 |  |  |  |  |
Total liabilities | 6,954,611 |  |  |  |  |
Net identifiable assets acquired over liabilities assumed | 720,955 |  |  |  |  |
Goodwill | 272,520 |  |  |  |  |
Net assets acquired over liabilities assumed | 993,475 |  |  |  |  |
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] |  |  |  |  |  |
Goodwill |  | $ 8,071 |  |  |  |
The First | Preliminary Adjustments |  |  |  |  |  |
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |  |
Securities | (71,772) |  |  |  |  |
Loans, including loans held for sale | (152,153) |  |  |  |  |
Premises and equipment | (1,596) |  |  |  |  |
Bank-owned life insurance | 0 |  |  |  |  |
Other real estate owned | 2,696 |  |  |  |  |
Core deposit intangible | 102,711 |  |  |  |  |
Other assets | 3,859 |  |  |  |  |
Total assets | (116,255) |  |  |  |  |
Deposits | (7,391) |  |  |  |  |
Borrowings | (2,902) |  |  |  |  |
Other liabilities | (15,903) |  |  |  |  |
Total liabilities | (26,196) |  |  |  |  |
Net identifiable assets acquired over liabilities assumed | (90,059) |  |  |  |  |
Goodwill | 158,364 |  |  |  |  |
Net assets acquired over liabilities assumed | 68,305 |  |  |  |  |
The First | Measurement Period Adjustments |  |  |  |  |  |
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |  |
Securities | 174 |  |  |  |  |
Loans, including loans held for sale | (1,511) |  |  |  |  |
Premises and equipment | 0 |  |  |  |  |
Bank-owned life insurance | 0 |  |  |  |  |
Other real estate owned | 0 |  |  |  |  |
Core deposit intangible | 0 |  |  |  |  |
Other assets | 379 |  |  |  |  |
Total assets | (958) |  |  |  |  |
Deposits | 0 |  |  |  |  |
Borrowings | 0 |  |  |  |  |
Other liabilities | 61 |  |  |  |  |
Total liabilities | 61 |  |  |  |  |
Net identifiable assets acquired over liabilities assumed | (1,019) |  |  |  |  |
Goodwill | (8,071) |  |  |  |  |
Net assets acquired over liabilities assumed | (9,090) |  |  |  |  |
Fair Value of Net Assets Acquired at Date of Acquisition |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 263,352 |  |  |  |  |
Securities | 1,457,377 |  |  |  |  |
Loans, including loans held for sale | 5,173,392 |  |  |  |  |
Premises and equipment | 173,174 |  |  |  |  |
Bank-owned life insurance | 146,601 |  |  |  |  |
Other real estate owned | 11,109 |  |  |  |  |
Core deposit intangible | 159,610 |  |  |  |  |
Other assets | 173,738 |  |  |  |  |
Total assets | 7,558,353 |  |  |  |  |
Deposits | 6,449,393 |  |  |  |  |
Borrowings | 419,165 |  |  |  |  |
Other liabilities | 59,918 |  |  |  |  |
Total liabilities | 6,928,476 |  |  |  |  |
Net identifiable assets acquired over liabilities assumed | 629,877 |  |  |  |  |
Goodwill | 422,813 |  |  |  |  |
Net assets acquired over liabilities assumed | $ 1,052,690 |  |  |  |  |

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