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INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Information Concerning Intangible Assets with Finite Life | The following table provides information on the significant components of goodwill and other acquired intangible assets as of December 31, (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | Additions: |  | ​ | ​ |  | Net
​ | ​ | Carrying | ​ | American National | ​ | Accumulated | ​ | Carrying
​ | ​ | Value | ​ | Acquisition (1) | ​ | Amortization | ​ | Value
2024 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Goodwill | ​ | $ | 925,211 | ​ | $ | 288,842 | ​ | $ | — | ​ | $ | 1,214,053
Core deposit intangibles | ​ | ​ | 85,491 | ​ | ​ | 74,410 | ​ | ​ | (85,768) | ​ | ​ | 74,133
Other amortizable intangibles | ​ | ​ | 3,977 | ​ | ​ | 10,277 | ​ | ​ | (3,824) | ​ | ​ | 10,430
2023 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 925,211 | ​ | $ | — | ​ | $ | — | ​ | $ | 925,211
Core deposit intangibles | ​ | ​ | 85,491 | ​ | ​ | — | ​ | ​ | (68,599) | ​ | ​ | 16,892
Other amortizable intangibles | ​ |  | 3,977 | ​ |  | — | ​ |  | (1,686) | ​ |  | 2,291
(1) Includes initial goodwill of $282.3 million and goodwill adjustments totaling $6.5 million related to the American National acquisition.
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 December 31, (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Wholesale Banking | ​ | Consumer Banking | ​ | Corporate Other | ​ | Total
2024 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
Goodwill (1) | ​ | $ | 850,035 | ​ | $ | 364,018 | ​ | $ | — | ​ | $ | 1,214,053
Intangible Assets (2) | ​ |  | 8,714 | ​ |  | 778 | ​ |  | 75,071 | ​ |  | 84,563
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 $210.8 million and $78.0 million, respectively, which were added in 2024 related to the American National acquisition. (2) Wholesale Banking and Corporate Other includes gross carrying values of $8.4 million and $76.3 million, respectively, which were added in 2024 related to the American National acquisition.
Estimated Remaining Amortization Expense of Intangibles | As of December 31, 2024, the estimated remaining amortization expense of intangibles is as follows for the years ended (dollars in thousands): ​
​ | ​ | ​ | ​
2025 | ​ | ​ | 19,950
2026 | ​ | ​ | 16,245
2027 | ​ | ​ | 12,936
2028 | ​ | ​ | 10,151
2029 | ​ | ​ | 7,872
Thereafter | ​ | ​ | 17,409
Total estimated amortization expense | ​ | $ | 84,563

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