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SHAREHOLDERS' EQUITY AND DIVIDEND LIMITATIONS (Details)
Mar. 31, 2026
shares
Dec. 31, 2025
shares
Sep. 02, 2025
shares
Sep. 01, 2025
shares
Common Stock        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)     1,900,000,000 160,000,000
Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     120,000 100,000
Common Class A        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares) 1,897,500,000 1,897,500,000 1,897,500,000  
Common stock, shares outstanding (in shares) 220,286,142 220,190,561    
Common Class A | Mechanics Bank Acquisition        
Class of Stock [Line Items]        
Business combination, fixed exchange ratio     3,301.092  
Common Class B        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares) 2,500,000 2,500,000 2,500,000  
Common stock, shares outstanding (in shares) 1,114,448 1,114,448    
Common Class B | Mechanics Bank Acquisition        
Class of Stock [Line Items]        
Business combination, fixed exchange ratio     330.1092  
Voting Common Stock | Mechanics Bank Acquisition        
Class of Stock [Line Items]        
Business combination, fixed exchange ratio     3,301.092  
Nonvoting Common Stock | Mechanics Bank Acquisition        
Class of Stock [Line Items]        
Business combination, fixed exchange ratio     330.1092