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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of carrying amount of goodwill by operating segment | The carrying amount of goodwill by operating segment is as follows (dollars in thousands):
| As of December 31,
| 2022 |  | 2021
Goodwill |  |  |
Banking | $ | 294,773 |  |  | $ | 294,773 |
FirsTech | 8,992 |  |  | 8,992 |
Wealth Management | 14,108 |  |  | 14,108 |
Total goodwill | $ | 317,873 |  |  | $ | 317,873 |
Schedule of other intangible asset disclosures | Core deposit and customer relationship intangible assets are amortized over the estimated period during which the Company expects to benefit from the assets. Intangible asset disclosures are as follows (dollars in thousands):
| As of December 31,
| 2022 |  | 2021
| Core deposit intangible |  | Customer relationship intangible |  | Total |  | Core deposit intangible |  | Customer relationship intangible |  | Total
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Intangible assets, gross | $ | 99,065 |  |  | $ | 33,138 |  |  | $ | 132,203 |  |  | $ | 99,065 |  |  | $ | 33,138 |  |  | $ | 132,203 |
Accumulated amortization | 63,476 |  |  | 22,304 |  |  | 85,780 |  |  | 55,161 |  |  | 18,991 |  |  | 74,152 |
Intangible assets, net | $ | 35,589 |  |  | $ | 10,834 |  |  | $ | 46,423 |  |  | $ | 43,904 |  |  | $ | 14,147 |  |  | $ | 58,051 |
Schedule of amortization expense relating to intangible assets | Amortization expense related to intangible assets, as reflected in the Company's Consolidated Statements of Income, is presented in the table below (dollars in thousands):
| Years Ended December 31,
| 2022 |  | 2021 |  | 2020
Amortization Expense |  |  |  |  |
Core deposit intangible | $ | 8,315 |  |  | $ | 8,253 |  |  | $ | 7,753 |
Customer relationship intangible | 3,313 |  |  | 3,021 |  |  | 2,255 |
Amortization of intangible assets | $ | 11,628 |  |  | $ | 11,274 |  |  | $ | 10,008 |
Schedule of carrying amount of amortized intangible assets | Future expense for the amortization of intangible assets, as estimated, is summarized in the table below (dollars in thousands):
| As of December 31, 2022
| Core deposit intangible |  | Customer relationship intangible |  | Total
Estimated amortization expense |  |  |  |  |
2023 | $ | 7,616 |  |  | $ | 2,816 |  |  | $ | 10,432 |
2024 | 6,902 |  |  | 2,318 |  |  | 9,220 |
2025 | 5,956 |  |  | 1,887 |  |  | 7,843 |
2026 | 5,227 |  |  | 1,479 |  |  | 6,706 |
2027 | 4,490 |  |  | 1,091 |  |  | 5,581 |
Thereafter | 5,398 |  |  | 1,243 |  |  | 6,641 |
Total estimated amortization expense | $ | 35,589 |  |  | $ | 10,834 |  |  | $ | 46,423 |

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