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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]      
Goodwill, beginning of period $ 373,121 $ 373,121 $ 373,121
Goodwill, Other Changes 0    
Goodwill, end of period 373,121 373,121 373,121
Amortization (5,279) (6,571) (7,732)
Intangible Assets, Net (Including Goodwill), beginning of period 387,976 394,547 402,279
Intangible Assets (including Goodwill), Other Changes (136)    
Intangible Assets, Net (Including Goodwill), end of period 382,561 387,976 394,547
Core Deposit Intangibles [Member]      
Goodwill [Line Items]      
Balance, beginning of period 14,855 21,426 29,158
Amortization (5,279) (6,571) (7,732)
Finite-Lived Intangible Assets, Other Changes 136    
Balance, end of period $ 9,440 $ 14,855 $ 21,426