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SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information |  |  |  |  |  |
Interest income | $ 263,261 us-gaap_InterestAndDividendIncomeOperating |  | $ 286,173 us-gaap_InterestAndDividendIncomeOperating |  |  |
Charge for funds used | (70,094)ewbc_ChargeForFundsUsed |  | (60,496)ewbc_ChargeForFundsUsed |  |  |
Interest spread on funds used | 193,167 ewbc_InterestSpreadOnFundsUsed |  | 225,677 ewbc_InterestSpreadOnFundsUsed |  |  |
Interest expense | (27,544)us-gaap_InterestExpense |  | (28,207)us-gaap_InterestExpense |  |  |
Credit on funds provided | 70,094 ewbc_CreditOnFundsProvided |  | 60,496 ewbc_CreditOnFundsProvided |  |  |
Interest spread on funds provided | 42,550 ewbc_InterestSpreadOnFundsProvided |  | 32,289 ewbc_InterestSpreadOnFundsProvided |  |  |
Net interest income (loss) | 235,717 us-gaap_InterestIncomeExpenseNet |  | 257,966 us-gaap_InterestIncomeExpenseNet |  |  |
Provision for loan losses | 4,987 us-gaap_ProvisionForLoanAndLeaseLosses |  | 6,933 us-gaap_ProvisionForLoanAndLeaseLosses |  |  |
Depreciation, amortization and accretion | 4,127 us-gaap_DepreciationAmortizationAndAccretionNet | [1] | 9,064 us-gaap_DepreciationAmortizationAndAccretionNet | [1],[2] |  |
Goodwill | 469,433 us-gaap_Goodwill |  | 458,467 us-gaap_Goodwill |  | 469,433 us-gaap_Goodwill |
Segment pre-tax profit | 146,826 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 116,163 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [2] |  |
Segment assets | 29,906,835 us-gaap_Assets |  | 27,400,604 us-gaap_Assets | [2] | 28,743,592 us-gaap_Assets | [2]
Retail Banking |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Interest income | 87,446 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 98,724 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Charge for funds used | (23,298)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | (16,045)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Interest spread on funds used | 64,148 ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 82,679 ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Interest expense | (12,224)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | (11,711)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Credit on funds provided | 57,668 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 48,193 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Interest spread on funds provided | 45,444 ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 36,482 ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Net interest income (loss) | 109,592 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 119,161 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Provision for loan losses | 731 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 2,652 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Depreciation, amortization and accretion | 1,682 us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember | [1] | 2,571 us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember | [1],[2] |  |
Goodwill | 357,207 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 354,163 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  |  |
Segment pre-tax profit | 52,935 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 52,170 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember | [2] |  |
Segment assets | 7,540,501 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember |  | 7,877,996 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ewbc_RetailBankingMember | [2] |  |
Commercial Banking |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Interest income | 158,786 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 169,076 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Charge for funds used | (37,351)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | (21,328)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Interest spread on funds used | 121,435 ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 147,748 ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Interest expense | (4,263)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | (3,280)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Credit on funds provided | 8,016 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 8,436 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Interest spread on funds provided | 3,753 ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 5,156 ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Net interest income (loss) | 125,188 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 152,904 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Provision for loan losses | 4,256 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 4,281 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Depreciation, amortization and accretion | (10,477)us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember | [1] | (3,328)us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember | [1],[2] |  |
Goodwill | 112,226 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 104,304 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  |  |
Segment pre-tax profit | 93,175 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 86,931 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember | [2] |  |
Segment assets | 15,491,368 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember |  | 13,661,149 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ewbc_CommercialBankingMember | [2] |  |
Other |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Interest income | 17,029 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 18,373 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Charge for funds used | (9,445)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (23,123)ewbc_ChargeForFundsUsed / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Interest spread on funds used | 7,584 ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (4,750)ewbc_InterestSpreadOnFundsUsed / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Interest expense | (11,057)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (13,216)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Credit on funds provided | 4,410 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 3,867 ewbc_CreditOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Interest spread on funds provided | (6,647)ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (9,349)ewbc_InterestSpreadOnFundsProvided / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Net interest income (loss) | 937 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (14,099)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Depreciation, amortization and accretion | 12,922 us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] | 9,821 us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1],[2] |  |
Segment pre-tax profit | 716 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | (22,938)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [2] |  |
Segment assets | $ 6,874,966 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 5,861,459 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [2] |  |
[1] | Includes amortization and accretion related to the FDIC indemnification asset.
[2] | Prior periods were restated to reflect the retrospective application of adopting the new accounting guidance related to the Company?s investments in qualified affordable housing projects Accounting Standard Update ("ASU") 2014-01. See Note 10 of the Notes to Consolidated Financial Statements for additional information.

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