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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:
| 2023 |  | 2022
| (Dollars in thousands)
Balances not subject to amortization |  |  |
Goodwill | $ | 985,072 |  |  | $ | 985,072 |
Balances subject to amortization |  |  |
Core deposit intangibles | 15,237 |  |  | 20,757 |
Other intangible assets | 2,953 |  |  | 4,311 |
Total other intangible assets | 18,190 |  |  | 25,068 |
Total goodwill and other intangible assets | $ | 1,003,262 |  |  | $ | 1,010,140 |
Schedule of Goodwill | The changes in the carrying value of goodwill for the periods indicated were as follows:
| 2023 |  | 2022 |  | 2021
| (Dollars in thousands)
Balance at beginning of year | $ | 985,072 |  |  | $ | 985,072 |  |  | $ | 506,206 |
Acquisitions | — |  |  | — |  |  | 478,866 |
Balance at end of year | $ | 985,072 |  |  | $ | 985,072 |  |  | 985,072 |
Schedule of Other Intangible Assets | The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated:
| December 31
| 2023 |  | 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (Dollars in thousands)
Core deposit intangibles | $ | 46,770 |  |  | $ | (31,533) |  |  | $ | 15,237 |  |  | $ | 46,770 |  |  | $ | (26,013) |  |  | $ | 20,757 |
Other intangible assets | 6,100 |  |  | (3,147) |  |  | 2,953 |  |  | 6,100 |  |  | (1,789) |  |  | 4,311 |
Total | $ | 52,870 |  |  | $ | (34,680) |  |  | $ | 18,190 |  |  | $ | 52,870 |  |  | $ | (27,802) |  |  | $ | 25,068 |
Schedule of Intangible Assets Estimated Annual Amortization Expense | The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:
Year | Amount
| (Dollars in thousands)
2024 | $ | 5,905 |
2025 | $ | 4,716 |
2026 | $ | 2,820 |
2027 | $ | 2,077 |
2028 | $ | 1,377 |

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