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GOODWILL AND OTHER INTANGIBLES - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 02, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]            
Goodwill   $ 843,305,000   $ 843,305,000   $ 843,305,000
Intangible asset useful life (in years)   8 years   8 years    
Impairment of intangible assets       $ 0 $ 0  
Intangible assets amortization period (in years)   8 years   8 years    
Aggregate amortization of intangible assets   $ 4,251,000 $ 3,302,000 $ 9,655,000 $ 10,705,000  
Mechanics Bank Acquisition | DUS License            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets acquired $ 23,500,000          
Core Deposits | Mechanics Bank Acquisition            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets acquired in merger, core deposits $ 90,800,000          
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset useful life (in years)   6 years   6 years    
Minimum | Core Deposits            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets amortization period (in years)   6 years   6 years    
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset useful life (in years)   10 years   10 years    
Maximum | Core Deposits            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets amortization period (in years)   10 years   10 years