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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, 2024
Dec. 31, 2023
Dec. 31, 2022
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 378,805 382,561 387,976
Intangible Assets, Net (Including Goodwill), end of period 376,179 378,805 382,561
Amortization (2,626) (3,756) (5,279)
Finite-Lived Intangible Assets, Other Changes     136
Intangible Assets (including Goodwill), Other Changes     (136)
Core Deposit Intangibles [Member]      
Goodwill [Line Items]      
Balance, beginning of period 5,684 9,440 14,855
Amortization (2,626) (3,756) (5,279)
Balance, end of period $ 3,058 $ 5,684 $ 9,440