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STOCK COMPENSATION Plans (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Range of exercise price per share from $10.00 to $14.99  
Stock options outstanding  
Range of exercise prices, low end of the range (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Range of exercise prices, high end of the range (in dollars per share) $ 14.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Options Outstanding  
Number of Outstanding Options (in shares) 2,365us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Weighted Average Exercise Price (in dollars per share) $ 14.95us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Weighted Average Remaining Contractual Life 1 year 7 days
Options Exercisable  
Number of Exercisable Options (in shares) 2,365us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Weighted Average Exercise Price (in dollars per share) $ 14.95us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars14.99Member
Range of exercise price per share from $20.00 to $24.99  
Stock options outstanding  
Range of exercise prices, low end of the range (in dollars per share) $ 20.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Range of exercise prices, high end of the range (in dollars per share) $ 24.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Options Outstanding  
Number of Outstanding Options (in shares) 39,751us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Weighted Average Exercise Price (in dollars per share) $ 21.09us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Weighted Average Remaining Contractual Life 1 month 21 days
Options Exercisable  
Number of Exercisable Options (in shares) 39,751us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Weighted Average Exercise Price (in dollars per share) $ 21.09us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars20.00ToDollars24.99Member
Range of exercise price per share from $10.00 to $24.99  
Stock options outstanding  
Range of exercise prices, low end of the range (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member
Range of exercise prices, high end of the range (in dollars per share) $ 24.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member
Options Outstanding  
Number of Outstanding Options (in shares) 42,116us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member
Weighted Average Exercise Price (in dollars per share) $ 20.75us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member
Weighted Average Remaining Contractual Life 2 months 9 days
Options Exercisable  
Number of Exercisable Options (in shares) 42,116us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member
Weighted Average Exercise Price (in dollars per share) $ 20.75us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ewbc_ExercisePriceRangeFromDollars10.00ToDollars24.99Member