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GOODWILL AND INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill and intangible assets by operating segment |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Wholesale Banking | ​ | Consumer Banking | ​ | Corporate Other | ​ | Total
March 31, 2025 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
Goodwill | ​ | $ | 850,035 | ​ | $ | 364,018 | ​ | $ | — | ​ | $ | 1,214,053
Intangible Assets | ​ |  | 8,410 | ​ |  | 737 | ​ |  | 70,018 | ​ |  | 79,165
December 31, 2024 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Goodwill | ​ | $ | 850,035 | ​ | $ | 364,018 | ​ | $ | — | ​ | $ | 1,214,053
Intangible Assets | ​ |  | 8,714 | ​ |  | 778 | ​ |  | 75,071 | ​ |  | 84,563
Estimated Remaining Amortization Expense of Intangibles |
​ | ​ | ​ | ​
For the remaining nine months of 2025 |  | $ | 14,551
2026 | ​ | ​ | 16,245
2027 | ​ | ​ | 12,936
2028 | ​ | ​ | 10,151
2029 | ​ | ​ | 7,872
Thereafter | ​ | ​ | 17,410
Total estimated amortization expense | ​ | $ | 79,165
​

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