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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Information Concerning Intangible Assets with Finite Life |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | Additions: |  | ​ | ​ |  | Net
​ | ​ | Carrying | ​ | American National | ​ | Accumulated | ​ | Carrying
​ | ​ | Value | ​ | Acquisition (1) | ​ | Amortization | ​ | Value
September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Goodwill | ​ | $ | 925,211 | ​ | $ | 287,499 | ​ | $ | — | ​ | $ | 1,212,710
CDI | ​ | ​ | 85,491 | ​ | ​ | 74,410 | ​ | ​ | (80,828) | ​ | ​ | 79,073
Other amortizable intangibles | ​ | ​ | 3,977 | ​ | ​ | 10,277 | ​ | ​ | (3,151) | ​ | ​ | 11,103
December 31, 2023 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 925,211 | ​ | $ | — | ​ | $ | — | ​ | $ | 925,211
CDI | ​ | ​ | 85,491 | ​ | ​ | — | ​ | ​ | (68,599) | ​ | ​ | 16,892
Other amortizable intangibles | ​ |  | 3,977 | ​ |  | — | ​ |  | (1,686) | ​ |  | 2,291
(1) Includes initial goodwill of $282.3 million and a goodwill adjustment of $5.2 million related to the American National acquisition. Refer to Note 2 “Acquisitions” for more information.
Schedule of goodwill and intangible assets by operating segment | The following table presents the Company’s goodwill and intangible assets by operating segment as of the periods ended (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Wholesale Banking | ​ | Consumer Banking | ​ | Corporate Other | ​ | Total
September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
Goodwill (1) | ​ | $ | 845,239 | ​ | $ | 362,245 | ​ | $ | 5,226 | ​ | $ | 1,212,710
Intangible Assets (2) | ​ |  | 9,032 | ​ |  | 830 | ​ |  | 80,314 | ​ |  | 90,176
December 31, 2023 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 639,180 | ​ | $ | 286,031 | ​ | $ | — | ​ | $ | 925,211
Intangible Assets | ​ |  | 1,302 | ​ |  | 989 | ​ |  | 16,892 | ​ |  | 19,183
(1) Wholesale Banking and Consumer Banking includes gross carrying values of $209.9 million and $77.6 million, respectively, which were added in the second quarter of 2024 related to the American National acquisition. Refer to Note 2 “Acquisitions” for more information. (2) Wholesale Banking and Corporate Other includes gross carrying values of $8.4 million and $76.3 million, respectively, which were added in the second quarter of 2024 related to the American National acquisition. Refer to Note 2 “Acquisitions” for more information.
Estimated Remaining Amortization Expense of Intangibles |
​ | ​ | ​ | ​
For the remaining three months of 2024 |  | $ | 5,615
2025 | ​ | ​ | 19,950
2026 | ​ | ​ | 16,245
2027 | ​ | ​ | 12,936
2028 | ​ | ​ | 10,151
Thereafter | ​ | ​ | 25,279
Total estimated amortization expense | ​ | $ | 90,176
​

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