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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |
Goodwill, beginning of period | $ 373,121 | $ 373,121 | $ 373,121
Goodwill, end of period | 373,121 | 373,121 | 373,121
Intangible Assets, Net (Including Goodwill), beginning of period | 382,561 | 387,976 | 394,547
Intangible Assets, Net (Including Goodwill), end of period | 378,805 | 382,561 | 387,976
Amortization | (3,756) | (5,279) | (6,571)
Finite-Lived Intangible Assets, Other Changes |  | (136) |
Core Deposit Intangibles [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance, beginning of period | 9,440 | 14,855 | 21,426
Amortization | (3,756) | (5,279) | (6,571)
Finite-Lived Intangible Assets, Other Changes |  | (136) |
Balance, end of period | $ 5,684 | $ 9,440 | $ 14,855

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