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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Amounts of Goodwill by Operating Segments | The carrying amounts of goodwill by operating segments for the nine months ended September 30, 2025 and 2024 are set forth in the table below.
| 2025 |  | 2024
| Community Banks |  |  |  | Total |  | Community Banks |  | Insurance |  | Total
Balance at January 1 | $ | 988,898 |  |  |  |  | $ | 988,898 |  |  | $ | 988,898 |  |  | $ | 2,767 |  |  | $ | 991,665 |
Additions to goodwill from The First merger | 422,813 |  |  |  |  | 422,813 |  |  | — |  |  | — |  |  | — |
Sale of the insurance agency | — |  |  |  |  | — |  |  | — |  |  | (2,767) |  |  | (2,767) |
Balance at September 30 | $ | 1,411,711 |  |  |  |  | $ | 1,411,711 |  |  | $ | 988,898 |  |  | $ | — |  |  | $ | 988,898 |
Schedule of Finite-Lived Intangible Assets | The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
September 30, 2025 |  |  |  |  |
Core deposit intangibles | $ | 242,102 |  |  | $ | (89,733) |  |  | $ | 152,369 |
Customer relationship intangible | 7,670 |  |  | (4,962) |  |  | 2,708 |
Total finite-lived intangible assets | $ | 249,772 |  |  | $ | (94,695) |  |  | $ | 155,077 |
December 31, 2024 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (71,881) |  |  | $ | 10,611 |
Customer relationship intangible | 7,670 |  |  | (4,176) |  |  | 3,494 |
Total finite-lived intangible assets | $ | 90,162 |  |  | $ | (76,057) |  |  | $ | 14,105 |
Schedule of Estimated Amortization Expense of finite-Lived Intangible Assets | Amortization expense for finite-lived intangible assets is presented in the table below.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 8,412 |  |  | $ | 862 |  |  | $ | 17,852 |  |  | $ | 2,664 |
Customer relationship intangible | 262 |  |  | 298 |  |  | 786 |  |  | 894 |
Total intangible amortization | $ | 8,674 |  |  | $ | 1,160 |  |  | $ | 18,638 |  |  | $ | 3,558 |
Schedule of Estimated Amortization Expense of Finite-lived Intangible Assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2025 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2025 | $ | 26,055 |  |  | $ | 1,048 |  |  | $ | 27,103 |
2026 | 30,732 |  |  | 860 |  |  | 31,592 |
2027 | 27,440 |  |  | 628 |  |  | 28,068 |
2028 | 23,337 |  |  | 483 |  |  | 23,820 |
2029 | 18,335 |  |  | 331 |  |  | 18,666 |
Thereafter | 44,322 |  |  | 144 |  |  | $ | 44,466 |

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