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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of the significant components of goodwill and intangible assets | The following table provides information on the significant components of goodwill and other acquired intangible assets as of the periods ended (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | Additions: |  | ​ | ​ |  | Net
​ | ​ | Carrying | ​ | Sandy Spring | ​ | Accumulated | ​ | Carrying
​ | ​ | Value | ​ | Acquisition (1) | ​ | Amortization | ​ | Value
September 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Goodwill | ​ | $ | 1,214,053 | ​ | $ | 512,333 | ​ | $ | — | ​ | $ | 1,726,386
CDIs | ​ | ​ | 153,740 | ​ | ​ | 243,351 | ​ | ​ | (116,136) | ​ | ​ | 280,955
Other amortizable intangibles | ​ | ​ | 14,254 | ​ | ​ | 47,299 | ​ | ​ | (9,272) | ​ | ​ | 52,281
(1) Includes a $15.4 million increase in preliminary goodwill associated with the Sandy Spring acquisition related to measurement period adjustments during the third quarter of 2025. Refer to Note 2 “Acquisitions” for more information. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross |  | Additions: |  | ​ | ​ |  | Net
​ | ​ | Carrying | ​ | American National | ​ | Accumulated | ​ | Carrying
​ | ​ | Value | ​ | Acquisition | ​ | Amortization | ​ | Value
December 31, 2024 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 925,211 | ​ | $ | 288,842 | ​ | $ | — | ​ | $ | 1,214,053
CDIs | ​ | ​ | 85,491 | ​ | ​ | 74,410 | ​ | ​ | (85,768) | ​ | ​ | 74,133
Other amortizable intangibles | ​ |  | 3,977 | ​ | ​ | 10,277 | ​ | ​ | (3,824) | ​ | ​ | 10,430
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, 2025 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
Goodwill (1) | ​ | $ | 1,249,654 | ​ | $ | 476,732 | ​ | $ | — | ​ | $ | 1,726,386
Intangible Assets (2) | ​ |  | 52,037 | ​ |  | 657 | ​ |  | 280,542 | ​ |  | 333,236
December 31, 2024 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 850,035 | ​ | $ | 364,018 | ​ | $ | — | ​ | $ | 1,214,053
Intangible Assets | ​ |  | 8,714 | ​ |  | 778 | ​ |  | 75,071 | ​ |  | 84,563
(1) | Wholesale Banking and Consumer Banking includes gross carrying values of $399.6 million and $112.7 million, respectively, related to goodwill from the Sandy Spring acquisition. Refer to Note 2 “Acquisitions” for more information.
Estimated Remaining Amortization Expense of Intangibles | Amortization expense of intangibles for the three months ended September 30, 2025 and 2024 totaled $18.1 million and $5.8 million, respectively, and totaled $42.0 million and $13.7 million, respectively, for the nine months ended September 30, 2025 and 2024. As of September 30, 2025, the estimated remaining amortization expense of intangibles is as follows for the years ending (dollars in thousands): ​
​ | ​ | ​ | ​
For the remaining three months of 2025 |  | $ | 17,691
2026 | ​ | ​ | 60,282
2027 | ​ | ​ | 50,407
2028 | ​ | ​ | 41,936
2029 | ​ | ​ | 35,235
Thereafter | ​ | ​ | 127,685
Total estimated amortization expense | ​ | $ | 333,236
​

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