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GOODWILL (Tables) | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the three and nine months ended September 30, 2022 and September 30, 2021 were as follows:
|  | Three months ended |  | Nine months ended
|  | September 30, |  | September 30,
(Dollars in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Balance at beginning of period |  | $ | 999,959 |  |  | $ | 937,771 |  |  | $ | 1,000,749 |  |  | $ | 937,771 |
Goodwill resulting from business combinations |  | (1,537) |  |  | 0 |  |  | (2,327) |  |  | 0 |
Balance at end of period |  | $ | 998,422 |  |  | $ | 937,771 |  |  | $ | 998,422 |  |  | $ | 937,771 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | September 30, 2022 |  | December 31, 2021
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized other intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 41,750 |  |  | $ | (25,761) |  |  | $ | 45,256 |  |  | $ | (26,911) |
Customer list |  | 69,563 |  |  | (12,933) |  |  | 69,563 |  |  | (8,362) |
Other |  | 14,079 |  |  | (6,668) |  |  | 14,589 |  |  | (5,237) |
Unamortized other intangible assets |  |  |  |  |  |  |  |
Mortgage servicing rights |  | 16,498 |  |  | 0 |  |  | 15,469 |  |  | 0 |
Total |  | $ | 141,890 |  |  | $ | (45,362) |  |  | $ | 144,877 |  |  | $ | (40,510) |

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