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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 373,121 $ 373,121
Goodwill, end of period 373,121 373,121
Finite-lived Intangible Assets [Roll Forward]    
Goodwill and other intangibles, net, beginning of period 382,561 387,976
Amortization (1,050) (5,279)
Goodwill and other intangibles, net, end of period 381,511 382,561
Core Deposit Intangibles [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Finite lived assets Balance, beginning of period 9,440 14,855
Amortization (1,050) (5,279)
finite-lived intangible assets, other changes   136
Finite lived assets Balance, end of period $ 8,390 $ 9,440