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SUBSEQUENT EVENTS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Feb. 13, 2015
Jan. 31, 2015
May 20, 2014
Subsequent events        
Number of shares repurchased 0cpf_StockRepurchaseProgramNumberOfSharesRepurchased      
Common Stock        
Subsequent events        
Amount authorized under the 2014 Repurchase Plan       $ 30.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Number of shares repurchased 857,554cpf_StockRepurchaseProgramNumberOfSharesRepurchased
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Repurchased amount 16.5us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Remaining amount available for repurchase 13.5us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Subsequent Event | Common Stock | Repurchase Agreements        
Subsequent events        
Increase in authorized amount     25.0cpf_StockRepurchaseProgramIncreaseInAuthorizedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_RepurchaseAgreementsMember
 
Amount authorized under the 2014 Repurchase Plan     55.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_RepurchaseAgreementsMember
 
Number of shares repurchased   473,829cpf_StockRepurchaseProgramNumberOfSharesRepurchased
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_RepurchaseAgreementsMember
   
Repurchased amount   9.3us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_RepurchaseAgreementsMember
   
Remaining amount available for repurchase   $ 29.2us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_RepurchaseAgreementsMember