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EQUITY (Details) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Nov. 30, 2017
Jan. 31, 2016
EQUITY            
Shares of common stock repurchased   849,290 697,483      
Central Pacific Bank            
EQUITY            
Statutory retained earnings   $ 87,500,000        
Common Stock            
EQUITY            
Up to value of shares repurchased   $ 24,800,000   $ 26,600,000    
Shares of common stock repurchased   849,290   864,483    
Common Stock | 2016 Repurchase Plan            
EQUITY            
Up to value of shares repurchased $ 100,000          
Shares of common stock repurchased 1,750          
Amount authorized under the Repurchase Plan $ 30,000,000.0         $ 30,000,000.0
Common Stock | 2017 Repurchase Plan            
EQUITY            
Amount authorized under the Repurchase Plan         $ 50,000,000.0  
Stock repurchase program, remaining authorized repurchase amount   $ 28,700,000