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v2.4.1.9

QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
QUARTERLY FINANCIAL INFORMATION (unaudited) |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income | $ 287,135 us-gaap_InterestAndDividendIncomeOperating | $ 285,948 us-gaap_InterestAndDividendIncomeOperating | $ 294,442 us-gaap_InterestAndDividendIncomeOperating | $ 286,173 us-gaap_InterestAndDividendIncomeOperating | $ 293,203 us-gaap_InterestAndDividendIncomeOperating | $ 281,706 us-gaap_InterestAndDividendIncomeOperating | $ 255,353 us-gaap_InterestAndDividendIncomeOperating | $ 238,423 us-gaap_InterestAndDividendIncomeOperating | $ 1,153,698 us-gaap_InterestAndDividendIncomeOperating | $ 1,068,685 us-gaap_InterestAndDividendIncomeOperating | $ 1,051,095 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 27,647 us-gaap_InterestExpense | 28,974 us-gaap_InterestExpense | 27,992 us-gaap_InterestExpense | 28,207 us-gaap_InterestExpense | 28,195 us-gaap_InterestExpense | 27,456 us-gaap_InterestExpense | 27,709 us-gaap_InterestExpense | 29,132 us-gaap_InterestExpense | 112,820 us-gaap_InterestExpense | 112,492 us-gaap_InterestExpense | 132,168 us-gaap_InterestExpense
Net interest income | 259,488 us-gaap_InterestIncomeExpenseNet | 256,974 us-gaap_InterestIncomeExpenseNet | 266,450 us-gaap_InterestIncomeExpenseNet | 257,966 us-gaap_InterestIncomeExpenseNet | 265,008 us-gaap_InterestIncomeExpenseNet | 254,250 us-gaap_InterestIncomeExpenseNet | 227,644 us-gaap_InterestIncomeExpenseNet | 209,291 us-gaap_InterestIncomeExpenseNet | 1,040,878 us-gaap_InterestIncomeExpenseNet | 956,193 us-gaap_InterestIncomeExpenseNet | 918,927 us-gaap_InterestIncomeExpenseNet
Provision for loan losses on non-covered loans | 19,671 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 7,556 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 8,944 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 7,954 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 6,286 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 4,535 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 8,277 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | (762)ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 44,125 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 18,336 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered | 60,168 ewbc_ProvisionForLoanLeaseAndOtherLossesNoncovered
(Reversal of) provision for loan losses on covered loans | (671)ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 7,669 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | (944)ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | (1,021)ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | (820)ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | (964)ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 723 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 5,089 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 5,033 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 4,028 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered | 5,016 ewbc_ProvisionForLoanLeaseAndOtherLossesCovered
Net interest income after provision for loan losses | 240,488 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 241,749 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 258,450 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 251,033 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 259,542 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 250,679 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 218,644 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 204,964 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 991,720 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 933,829 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 853,743 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest (loss) income | 7,805 us-gaap_NoninterestIncome | 10,342 us-gaap_NoninterestIncome | (14,945)us-gaap_NoninterestIncome | (14,916)us-gaap_NoninterestIncome | (36,594)us-gaap_NoninterestIncome | (41,421)us-gaap_NoninterestIncome | (12,354)us-gaap_NoninterestIncome | (2,099)us-gaap_NoninterestIncome | (11,714)us-gaap_NoninterestIncome | (92,468)us-gaap_NoninterestIncome | (5,618)us-gaap_NoninterestIncome
Noninterest expense | 135,246 us-gaap_NoninterestExpense | 176,979 us-gaap_NoninterestExpense | 127,899 us-gaap_NoninterestExpense | 124,427 us-gaap_NoninterestExpense | 124,384 us-gaap_NoninterestExpense | 100,352 us-gaap_NoninterestExpense | 94,420 us-gaap_NoninterestExpense | 96,355 us-gaap_NoninterestExpense | 564,551 us-gaap_NoninterestExpense | 415,511 us-gaap_NoninterestExpense | 422,533 us-gaap_NoninterestExpense
Income before provision of income taxes | 113,047 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 75,112 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 115,606 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,690 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 98,564 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 108,906 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,870 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 106,510 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 415,455 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 425,850 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 425,592 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision (benefit) for income taxes | 20,049 us-gaap_IncomeTaxExpenseBenefit | (13,644)us-gaap_IncomeTaxExpenseBenefit | 31,618 us-gaap_IncomeTaxExpenseBenefit | 34,949 us-gaap_IncomeTaxExpenseBenefit | 22,782 us-gaap_IncomeTaxExpenseBenefit | 35,749 us-gaap_IncomeTaxExpenseBenefit | 37,855 us-gaap_IncomeTaxExpenseBenefit | 34,419 us-gaap_IncomeTaxExpenseBenefit | 72,972 us-gaap_IncomeTaxExpenseBenefit | 130,805 us-gaap_IncomeTaxExpenseBenefit | 143,942 us-gaap_IncomeTaxExpenseBenefit
Net income | 92,998 us-gaap_NetIncomeLoss | 88,756 us-gaap_NetIncomeLoss | 83,988 us-gaap_NetIncomeLoss | 76,741 us-gaap_NetIncomeLoss | 75,782 us-gaap_NetIncomeLoss | 73,157 us-gaap_NetIncomeLoss | 74,015 us-gaap_NetIncomeLoss | 72,091 us-gaap_NetIncomeLoss | 342,483 us-gaap_NetIncomeLoss | 295,045 us-gaap_NetIncomeLoss | 281,650 us-gaap_NetIncomeLoss
Preferred stock dividends |  |  |  |  |  |  | 1,714 us-gaap_PreferredStockDividendsAndOtherAdjustments | 1,714 us-gaap_PreferredStockDividendsAndOtherAdjustments |  | 3,428 us-gaap_PreferredStockDividendsAndOtherAdjustments | 6,857 us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common stockholders |  |  |  |  | $ 75,782 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 73,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 72,301 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 70,377 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 342,483 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 291,617 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 274,793 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per share | $ 0.65 us-gaap_EarningsPerShareBasic | $ 0.62 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 2.39 us-gaap_EarningsPerShareBasic | $ 2.11 us-gaap_EarningsPerShareBasic | $ 1.92 us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.54 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 2.38 us-gaap_EarningsPerShareDiluted | $ 2.10 us-gaap_EarningsPerShareDiluted | $ 1.89 us-gaap_EarningsPerShareDiluted

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