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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | $ 373,121 | $ 373,121 |  |
Goodwill, end of period | 373,121 |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible Assets, Net (Including Goodwill) | 379,663 |  | $ 382,561 | $ 387,976
Amortization | (2,898) | (5,279) |  |
Core Deposit Intangibles [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-Lived Intangible Assets, Net | 6,542 |  | $ 9,440 | $ 14,855
finite-lived intangible assets, other changes |  | 136 |  |
Amortization | $ (2,898) | $ (5,279) |  |

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