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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]        
Beginning of period $ 42,748 $ 1,974 $ 47,765 $ 2,414
Amortization expense (2,410) (2,464) (7,417) (2,904)
Balance, end of period 40,338 46,144 40,338 46,144
Core deposit intangible        
Finite-Lived Intangible Assets [Line Items]        
Acquired core deposit intangible 0 35,860 0 35,860
Customer list        
Finite-Lived Intangible Assets [Line Items]        
Adjustment to acquired customer list $ 0 $ 10,774 $ (10) $ 10,774