$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-Q Financial Statement

#000162828019013854 Filed on November 08, 2019

Income Statement

Concept	2019 Q3	2018 Q3	2018 Q2
Revenue	$476.9M	$422.2M	$400.3M
YoY Change	12.96%	24.2%	24.02%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$31.10M	$33.50M	$32.40M
YoY Change	-7.16%	-23.52%	-29.72%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$107.1M	$73.47M	$58.63M
YoY Change	45.79%	99.88%	79.39%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$206.4M	$204.9M	$197.0M
YoY Change	0.73%	16.88%	24.93%
Income Tax	$34.95M	$33.56M	$24.64M
% Of Pretax Income	16.94%	16.38%	12.51%
Net Earnings	$171.4M	$171.3M	$172.3M
YoY Change	0.07%	29.13%	45.65%
Net Earnings / Revenue	35.94%	40.58%	43.05%
Basic Earnings Per Share	$1.18	$1.18	$1.19
Diluted Earnings Per Share	$1.17	$1.17	$1.18
COMMON SHARES
Basic Shares Outstanding	145.6M shares	144.9M shares	144.9M shares
Diluted Shares Outstanding	146.1M shares	146.2M shares	146.1M shares

Balance Sheet

Concept	2019 Q3	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$3.042B	$2.219B	$2.297B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$120.9M	$120.3M	$122.1M
YoY Change	0.49%	-8.41%	-4.84%
Goodwill	$465.7M	$465.5M	$465.5M
YoY Change	0.03%	-0.83%	-0.82%
Intangibles
YoY Change
Long-Term Investments	$190.0M	$148.0M	$153.0M
YoY Change	28.38%	-16.85%	-9.47%
Other Assets		$0.00	$0.00
YoY Change		-100.0%	-100.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$43.27B	$39.04B	$38.04B
YoY Change	10.84%	7.53%	5.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$476.0M	$477.0M	$473.0M
YoY Change	-0.21%	-13.11%	8.49%
Deferred Revenue
YoY Change
Short-Term Debt	$47.69M	$56.41M	$58.52M
YoY Change	-15.46%	127.34%	139.59%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$476.0M	$477.0M	$473.0M
YoY Change	-0.21%	-13.11%	8.49%
LONG-TERM LIABILITIES
Long-Term Debt	$152.0M	$157.0M	$162.0M
YoY Change	-3.18%	-11.3%	-7.95%
Other Long-Term Liabilities	$260.0M	$134.0M	$115.0M
YoY Change	94.03%	47.25%	38.55%
Total Long-Term Liabilities	$412.0M	$291.0M	$277.0M
YoY Change	41.58%	8.58%	6.95%
TOTAL LIABILITIES
Total Short-Term Liabilities	$476.0M	$477.0M	$473.0M
Total Long-Term Liabilities	$412.0M	$291.0M	$277.0M
Total Liabilities	$38.39B	$34.83B	$33.96B
YoY Change	10.23%	7.08%	5.31%
SHAREHOLDERS EQUITY
Retained Earnings	$3.546B	$3.021B	$2.883B
YoY Change	17.38%	19.83%	19.27%
Common Stock	$166.0K	$166.0K	$166.0K
YoY Change	0.0%	0.61%	0.61%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$479.5M	$452.3M	$452.3M
YoY Change	6.0%	0.06%	0.15%
Treasury Stock Shares	20.99M shares	20.67M shares	20.67M shares
Shareholders Equity	$4.883B	$4.245B	$4.114B
YoY Change
Total Liabilities & Shareholders Equity	$43.27B	$39.07B	$38.07B
YoY Change	10.75%	7.62%	6.0%

Cashflow Statement

Concept	2019 Q3	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$171.4M	$171.3M	$172.3M
YoY Change	0.07%	29.13%	45.65%
Depreciation, Depletion And Amortization	$31.10M	$33.50M	$32.40M
YoY Change	-7.16%	-23.52%	-29.72%
Cash From Operating Activities	$99.00M	$258.4M	$217.0M
YoY Change	-61.69%	-9.81%	10.32%
INVESTING ACTIVITIES
Capital Expenditures	-$4.100M	-$1.800M	-$5.800M
YoY Change	127.78%	-72.73%	52.63%
Acquisitions
YoY Change
Other Investing Activities	-$867.6M	-$1.177B	-$429.4M
YoY Change	-26.27%	-16.99%	0.02%
Cash From Investing Activities	-$871.6M	-$1.179B	-$435.3M
YoY Change	-26.04%	-17.26%	0.53%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	205.3M	860.7M	228.2M
YoY Change	-76.15%	676.1%	-58.37%
NET CHANGE
Cash From Operating Activities	99.00M	258.4M	217.0M
Cash From Investing Activities	-871.6M	-1.179B	-435.3M
Cash From Financing Activities	205.3M	860.7M	228.2M
Net Change In Cash	-567.3M	-59.40M	9.900M
YoY Change	855.05%	-94.22%	-96.82%
FREE CASH FLOW
Cash From Operating Activities	$99.00M	$258.4M	$217.0M
Capital Expenditures	-$4.100M	-$1.800M	-$5.800M
Free Cash Flow	$103.1M	$260.2M	$222.8M
YoY Change	-60.38%	-11.22%	11.12%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001069157
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	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.63
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	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.78
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CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	USD
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CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	0	shares
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-24939
	dei	Entity Registrant Name EntityRegistrantName	EAST WEST BANCORP, INC.
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-4703316
	dei	Entity Address Address Line1 EntityAddressAddressLine1	135 North Los Robles Ave.
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	dei	Entity Address Address Line2 EntityAddressAddressLine2	7th Floor
	dei	Entity Address City Or Town EntityAddressCityOrTown	Pasadena
	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	91101
	dei	City Area Code CityAreaCode	626
	dei	Local Phone Number LocalPhoneNumber	768-6000
	dei	Security12b Title Security12bTitle	Common Stock, $0.001 Par Value
	dei	Trading Symbol TradingSymbol	EWBC
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1019486000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	970796000	USD
CY2019Q3	ewbc	Lendingfees Lendingfees	14846000	USD
CY2018Q3	ewbc	Lendingfees Lendingfees	15367000	USD
	ewbc	Lendingfees Lendingfees	45884000	USD
	ewbc	Lendingfees Lendingfees	44072000	USD
CY2019Q3	ewbc	Depositaccountfees Depositaccountfees	9918000	USD
CY2018Q3	ewbc	Depositaccountfees Depositaccountfees	9777000	USD
	ewbc	Depositaccountfees Depositaccountfees	29347000	USD
	ewbc	Depositaccountfees Depositaccountfees	30347000	USD
CY2019Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	8065000	USD
CY2018Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	6077000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	20366000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	14069000	USD
CY2019Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	4841000	USD
CY2018Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	3535000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	12453000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	10989000	USD
CY2019Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	8423000	USD
CY2018Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	4595000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	22037000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	17855000	USD
CY2019Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2037000	USD
CY2018Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1145000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2967000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5081000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	58000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	35000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3066000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	2374000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	48000	USD
CY2018Q3	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	3402000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	48000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5602000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2018Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	31470000	USD
CY2019Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3238000	USD
CY2018Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2569000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10196000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7355000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	51474000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	46502000	USD
	us-gaap	Noninterest Income NoninterestIncome	146364000	USD
	us-gaap	Noninterest Income NoninterestIncome	169214000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	97819000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	96733000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	300649000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	285832000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	17912000	USD
CY2018Q3	us-gaap	Occupancy Net OccupancyNet	17292000	USD
	us-gaap	Occupancy Net OccupancyNet	52592000	USD
	us-gaap	Occupancy Net OccupancyNet	50879000	USD
CY2019Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3550000	USD
CY2018Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6013000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9557000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	18118000	USD
CY2019Q3	us-gaap	Legal Fees LegalFees	1720000	USD
CY2018Q3	us-gaap	Legal Fees LegalFees	1544000	USD
	us-gaap	Legal Fees LegalFees	6300000	USD
	us-gaap	Legal Fees LegalFees	6636000	USD
CY2019Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3328000	USD
CY2018Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3289000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9945000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	10017000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	2559000	USD
CY2018Q3	us-gaap	Professional Fees ProfessionalFees	2683000	USD
	us-gaap	Professional Fees ProfessionalFees	6687000	USD
	us-gaap	Professional Fees ProfessionalFees	10155000	USD
CY2019Q3	ewbc	Depositrelatedexpenses Depositrelatedexpenses	3584000	USD
CY2018Q3	ewbc	Depositrelatedexpenses Depositrelatedexpenses	2600000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	10426000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	8201000	USD
CY2019Q3	ewbc	Computersoftwareexpense Computersoftwareexpense	6556000	USD
CY2018Q3	ewbc	Computersoftwareexpense Computersoftwareexpense	5478000	USD
	ewbc	Computersoftwareexpense Computersoftwareexpense	18845000	USD
	ewbc	Computersoftwareexpense Computersoftwareexpense	16081000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22769000	USD
CY2018Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	23394000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	67737000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	61780000	USD
CY2019Q3	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	16833000	USD
CY2018Q3	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	20789000	USD
	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	58477000	USD
	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	58670000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	176630000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	179815000	USD
	us-gaap	Noninterest Expense NoninterestExpense	541215000	USD
	us-gaap	Noninterest Expense NoninterestExpense	526369000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206367000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	204865000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	624635000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	613641000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34951000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33563000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	138815000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	82958000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	171302000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Net Income Loss NetIncomeLoss	530683000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.66
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.63
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146158000	shares
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4882664000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144921000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144829000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146120000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146173000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146088000	shares
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	171302000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Net Income Loss NetIncomeLoss	530683000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	11863000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-13608000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	62901000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-41261000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2858000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-4761000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5694000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-4785000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9005000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-18369000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	57207000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-46046000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	180421000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152933000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	543027000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	484637000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	4114284000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	171302000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-18369000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11344000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	33711000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	4244850000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4734593000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9005000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8143000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40493000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3841951000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-160000	USD
CY2018Q1	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	77693000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	57207000	USD
	us-gaap	Net Income Loss NetIncomeLoss	530683000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-46046000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	10726000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	92304000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	4244850000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4423974000	USD
CY2019Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	14668000	USD
	ewbc	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	4443000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11348000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	114796000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4882664000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Net Income Loss NetIncomeLoss	530683000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	103220000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	95777000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	12917000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	14471000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	23012000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	24201000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2434000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1371000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	80108000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	46296000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2967000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5081000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3066000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	2374000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	48000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5602000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	31470000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	6341000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	17642000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	6341000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	16652000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3012000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2670000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	363187000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	38164000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	773000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-1566000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	92036000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	389019000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	693316000	USD
	ewbc	Paymentsor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsorProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	103284000	USD
	ewbc	Paymentsor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsorProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	72983000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	204474000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-24925000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	300000000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-96801000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	162633000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	175000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	125000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	160000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	476231000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	296252000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	283974000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	404070000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1219300000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	514622000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	224662000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	363209000	USD
	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	395502000	USD
	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	451037000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1509235000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	2160858000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8504000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9418000	USD
	ewbc	Net Cash Outflow On Sale Of Business NetCashOutflowOnSaleOfBusiness	0	USD
	ewbc	Net Cash Outflow On Sale Of Business NetCashOutflowOnSaleOfBusiness	503687000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	0	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	3602000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	4563000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	4264000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1897000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3002000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1868818000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2654135000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1252237000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	2092022000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-9035000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	63131000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1500000000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1082000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	658000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	15000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1895000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1328000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	14230000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	15502000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	114986000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	92632000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1533223000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2033347000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-12520000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-28333000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	40904000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	44195000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3001377000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2174592000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3042281000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2218787000	USD
	us-gaap	Interest Paid Net InterestPaidNet	313793000	USD
	us-gaap	Interest Paid Net InterestPaidNet	166422000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	116074000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	71064000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	222434000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	363591000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	2306000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2013000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	USD
CY2019Q3	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	6	trust
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	400000000.0	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000.0	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1260000000	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1440000000	USD
CY2019Q3	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0257
CY2018Q3	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0263
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0269
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0259
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000.0	USD
CY2019Q3	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0468
CY2018Q3	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0465
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0487
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0436
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturing Remainderof Fiscal Year SecuritiesSoldUnderAgreementsToRepurchaseMaturingRemainderofFiscalYear	0	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Two SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearTwo	0	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Three SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearThree	0	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Four SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearFour	150000000	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Five SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearFive	300000000	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Year Six And Thereafter SecuritiesSoldUnderAgreementsToRepurchaseYearSixAndThereafter	0	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1260000000	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	400000000	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	860000000	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities	859396000	USD
CY2019Q3	us-gaap	Securities Purchased Under Agreements To Resell Amount Offset Against Collateral SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	604000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	400000000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	50000000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	50000000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1435000000	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	400000000	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1035000000	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities	1025066000	USD
CY2018Q4	us-gaap	Securities Purchased Under Agreements To Resell Amount Offset Against Collateral SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	9934000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	400000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	50000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	50000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3259784000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	32319000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	8069000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3284034000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	2806900000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5714000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	70767000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	2741847000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	785217000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2290000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	524008000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	5779000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1309225000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	8069000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	163128000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1518000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2087534000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	69249000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	2250662000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	70767000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	70	security
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	184	security
CY2019Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101129000	USD
CY2018Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	39377000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	476231000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	296252000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	58000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	35000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3066000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	2374000	USD
CY2019Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	17000	USD
CY2018Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	11000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	906000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	701000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1100414000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1099412000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	430577000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	429725000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	185633000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	189981000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1543160000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1564916000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3259784000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3284034000	USD
CY2019Q3	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	524400000	USD
CY2018Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	435800000	USD
CY2019Q3	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	58084000	USD
CY2018Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	56819000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	20250000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17250000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	78334000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	74069000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	358639000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	263734000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	6833000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	107816000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	118305000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	62741000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	62741000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	31569000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	31569000	USD
CY2019Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	6587000	USD
CY2019Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	47979000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	13577000	USD
CY2019Q3	us-gaap	Derivative Assets DerivativeAssets	289311000	USD
CY2019Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	153014000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	62670000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	79903000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	358639000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	62741000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	107816000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	31569000	USD
CY2019Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	6587000	USD
CY2019Q3	us-gaap	Derivative Assets DerivativeAssets	289311000	USD
CY2019Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	289311000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	263734000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	62741000	USD
CY2019Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	47979000	USD
CY2019Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	153014000	USD
CY2019Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	113365000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	39649000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	13577000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	62670000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	13975000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	48695000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	118305000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	31569000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	6833000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	79903000	USD
CY2018Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	11231000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	68672000	USD
CY2019Q3	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	357000000.0	USD
CY2018Q4	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	105900000	USD
CY2019Q3	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	1600000	USD
CY2018Q4	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	2000000.0	USD
CY2019Q3	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	263700000	USD
CY2018Q4	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	118200000	USD
CY2019Q3	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	67000	USD
CY2018Q4	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	102000	USD
CY2019Q3	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	7200000	USD
CY2018Q4	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	15800000	USD
CY2019Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	6600000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	13600000	USD
CY2019Q3	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	50900000	USD
CY2018Q4	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	8400000	USD
CY2019Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	48000000.0	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	6800000	USD
CY2019Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	34024976000	USD
CY2018Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	32385189000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	345576000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	311322000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	33679400000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	32073867000	USD
CY2019Q3	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	21830000000	USD
CY2018Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	20590000000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of all repayment sources, the borrower’s current payment performance or delinquency, current financial and liquidity status, and all other relevant information. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. Risk ratings are the overall credit quality indicator for the Company and the credit quality indicator is utilized for estimating the appropriate allowance for loan losses. The risk rating system classifies loans within the following categories: Pass, Watch, Special Mention, Substandard, Doubtful and Loss. The risk ratings reflect the relative strength of the repayment sources.</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Pass and Watch loans are loans that have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are loans that have potential weaknesses that warrant closer attention by management. Special Mention is a transitory grade. If the potential weaknesses are resolved, a loan is upgraded to a Pass or Watch grade. If negative trends in the borrower’s financial status or other information indicate that the sources of repayment may become inadequate, a loan is downgraded to a Substandard grade. Substandard loans have well-defined weaknesses that may jeopardize the full and timely repayment of the loan. Substandard loans have the distinct possibility of loss, if the deficiencies are not corrected. When management has assessed that there is potential for loss, but a distinct possibility of loss is not yet recognizable, the loan remains classified as Substandard grade. Doubtful loans are loans that have insufficient sources of repayment and a high probability of loss. Loss loans are loans that are uncollectible and of such little value that they are no longer considered bankable assets. These internal risk ratings are reviewed routinely and adjusted based on changes in the borrowers’ financial status and the loans’ collectability.</span></div>
CY2019Q3	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	1100000	USD
CY2018Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	133000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	2100000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	3900000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	345576000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	310041000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	345576000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	310041000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	345576000	USD
CY2019Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	34024976000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	311322000	USD
CY2018Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	32385189000	USD
CY2019Q3	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	49040000	USD
CY2019Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	55663000	USD
CY2019Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	68965000	USD
CY2018Q3	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	77960000	USD
CY2018Q3	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	2306000	USD
CY2018Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	93418000	USD
CY2018Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	61086000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	222434000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	229182000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	395250000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	363591000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	2306000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	386621000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	450908000	USD
CY2019Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	36000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	426000	USD
CY2018Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	110000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	13500000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	2000000.0	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	3000000.0	USD
CY2018Q3	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1100000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	5100000	USD
	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
CY2019Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	190000000	USD
CY2018Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	184873000	USD
CY2019Q3	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	66213000	USD
CY2018Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	80764000	USD
CY2019Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11539000	USD
CY2018Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	9425000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	34871000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	27520000	USD
CY2019Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	8452000	USD
CY2018Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	7236000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	27006000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	21009000	USD
CY2019Q3	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	211603000	USD
CY2018Q4	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	231635000	USD
CY2019Q3	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	69649000	USD
CY2018Q4	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	80228000	USD
CY2019Q3	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	16800000	USD
	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	58500000	USD
CY2018Q3	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	20800000	USD
	ewbc	Noninterest Expense Amortization Of Tax Credit Investments NoninterestExpenseAmortizationOfTaxCreditInvestments	58700000	USD
CY2019Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	188000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	955000	USD
CY2018Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-185000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-798000	USD
CY2018Q4	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	231600000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	465700000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	465500000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019Q3	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2017Q4	us-gaap	Goodwill Goodwill	469433000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	465547000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	465547000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	465697000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2019Q3	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P15Y
CY2019Q3	ewbc	Lease Rightof Use Asset LeaseRightofUseAsset	111826000	USD
CY2019Q3	ewbc	Lease Liability LeaseLiability	117498000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	8596000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	26346000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	251000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	733000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	38000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	125000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	31000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	93000	USD
CY2019Q3	us-gaap	Sublease Income SubleaseIncome	0	USD
	us-gaap	Sublease Income SubleaseIncome	81000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	8916000	USD
	us-gaap	Lease Cost LeaseCost	27216000	USD
CY2019Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	8798000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	26779000	USD
CY2019Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	38000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	125000	USD
CY2019Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	222000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	658000	USD
CY2019Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2794000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	17961000	USD
CY2019Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	39000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	265000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y9M18D
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P16Y1M6D
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0323
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0275
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	8713000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	260000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	32177000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	1037000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	27962000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1031000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	18278000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	691000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	11254000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	404000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	22559000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	3465000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	120943000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	6888000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	8801000	USD
CY2019Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1532000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	112142000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	5356000	USD
CY2019Q3	us-gaap	Net Investment In Lease NetInvestmentInLease	147200000	USD
CY2019Q3	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	31400000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	132431000	USD
CY2019Q3	ewbc	Salestype And Direct Financing Lease Unguaranteed Residual Asset SalestypeAndDirectFinancingLeaseUnguaranteedResidualAsset	14767000	USD
CY2019Q3	us-gaap	Net Investment In Lease NetInvestmentInLease	147198000	USD
CY2019Q3	ewbc	Salestype And Direct Financing Lease Lease Income SalestypeAndDirectFinancingLeaseLeaseIncome	1500000	USD
	ewbc	Salestype And Direct Financing Lease Lease Income SalestypeAndDirectFinancingLeaseLeaseIncome	4500000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Remainder Of Fiscal Year SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear	6884000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	27566000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	25584000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	18190000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	11995000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	20342000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	110561000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	10842000	USD
CY2019Q3	ewbc	Salestypeand Direct Financing Leases Present Valueof Lease Receivable SalestypeandDirectFinancingLeasesPresentValueofLeaseReceivable	99719000	USD
CY2019Q3	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5468590000	USD
CY2018Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5147821000	USD
CY2019Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1912783000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1796647000	USD
CY2019Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1910000000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	14759000	USD
CY2019Q3	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	36715000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	51474000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13312000	USD
CY2018Q3	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	33190000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	46502000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	41800000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	104564000	USD
	us-gaap	Noninterest Income NoninterestIncome	146364000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	41336000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	127878000	USD
	us-gaap	Noninterest Income NoninterestIncome	169214000	USD
CY2019Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34951000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33563000	USD
CY2019Q3	ewbc	Income Tax Expense Benefit Change Between Currentand Prior Period Percent IncomeTaxExpenseBenefitChangeBetweenCurrentandPriorPeriodPercent	0.04
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206367000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	204865000	USD
CY2019Q3	ewbc	Income Lossfrom Continuing Operationsbefore Income Taxes Change Between Currentand Prior Period Percent IncomeLossfromContinuingOperationsbeforeIncomeTaxesChangeBetweenCurrentandPriorPeriodPercent	0.01
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	624635000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	613641000	USD
	ewbc	Income Lossfrom Continuing Operationsbefore Income Taxes Change Between Currentand Prior Period Percent IncomeLossfromContinuingOperationsbeforeIncomeTaxesChangeBetweenCurrentandPriorPeriodPercent	0.02
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	138815000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	82958000	USD
	ewbc	Income Tax Expense Benefit Change Between Currentand Prior Period Percent IncomeTaxExpenseBenefitChangeBetweenCurrentandPriorPeriodPercent	0.67
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.169
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.164
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.222
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.135
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.169
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.164
CY2019Q3	ewbc	State Income Taxes Payable Reversal StateIncomeTaxesPayableReversal	6400000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.222
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.135
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	0	shares
CY2019Q3	us-gaap	Share Based Compensation ShareBasedCompensation	7487000	USD
CY2018Q3	us-gaap	Share Based Compensation ShareBasedCompensation	10986000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	23012000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	24201000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000	USD
CY2018Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	187000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4723000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5062000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	171416000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	171302000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	485820000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	530683000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144921000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144829000	shares
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.66
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	171416000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	171302000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	485820000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	530683000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144921000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	144829000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	561000	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1252000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	633000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1329000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146120000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146173000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146088000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146158000	shares
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.63
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	15224000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	6219000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9005000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-24115000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-5746000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-18369000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	87876000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	30669000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	57207000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-63397000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-17351000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-46046000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
	ewbc	Number Of Business Divisions NumberOfBusinessDivisions	2	segment
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	369807000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	38284000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	51474000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	176630000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206367000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
CY2019Q3	us-gaap	Assets Assets	43274659000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	348720000	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10542000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	46502000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	179815000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	204865000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	171302000	USD
CY2018Q3	us-gaap	Assets Assets	39042713000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1099594000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	80108000	USD
	us-gaap	Noninterest Income NoninterestIncome	146364000	USD
	us-gaap	Noninterest Expense NoninterestExpense	541215000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	624635000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
CY2019Q3	us-gaap	Assets Assets	43274659000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1017092000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	46296000	USD
	us-gaap	Noninterest Income NoninterestIncome	169214000	USD
	us-gaap	Noninterest Expense NoninterestExpense	526369000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	613641000	USD
	us-gaap	Net Income Loss NetIncomeLoss	530683000	USD
CY2018Q3	us-gaap	Assets Assets	39042713000	USD

Files In Submission

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$EWBC
EAST WEST BANCORP INC Stock $ewbc

2019 Q3 Form 10-Q Financial Statement

#000162828019013854 Filed on November 08, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC EAST WEST BANCORP INC Stock $ewbc

2019 Q3 Form 10-Q Financial Statement

#000162828019013854 Filed on November 08, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc