$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000106915720000072 Filed on November 06, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue		$365.7M	$476.9M
YoY Change		-23.31%	12.96%
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	$23.80M	$27.20M	$31.10M
YoY Change	-41.95%	-12.54%	-7.16%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$41.60M	$107.1M
YoY Change		-61.16%	45.79%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$213.4M	$196.1M	$206.4M
YoY Change	-2.68%	-4.99%	0.73%
Income Tax	$49.30M	$36.52M	$34.95M
% Of Pretax Income	23.1%	18.63%	16.94%
Net Earnings	$164.1M	$159.5M	$171.4M
YoY Change	-12.81%	-6.93%	0.07%
Net Earnings / Revenue		43.62%	35.94%
Basic Earnings Per Share		$1.13	$1.18
Diluted Earnings Per Share	$1.150M	$1.12	$1.17
COMMON SHARES
Basic Shares Outstanding	141.6M shares	141.5M shares	145.6M shares
Diluted Shares Outstanding		142.0M shares	146.1M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$4.018B	$4.507B	$3.042B
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	$103.3M	$107.5M	$120.9M
YoY Change	-12.77%	-11.05%	0.49%
Goodwill	$465.7M	$465.7M	$465.7M
YoY Change	0.0%	0.0%	0.03%
Intangibles
YoY Change
Long-Term Investments	$214.0M	$193.0M	$190.0M
YoY Change	3.38%	1.58%	28.38%
Other Assets	$164.0M
YoY Change	53.27%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$52.16B	$50.37B	$43.27B
YoY Change	18.01%	16.4%	10.84%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$900.0M	$921.0M	$476.0M
YoY Change	91.08%	93.49%	-0.21%
Deferred Revenue
YoY Change
Short-Term Debt	$321.0M	$408.0M	$47.69M
YoY Change	1019.68%	755.54%	-15.46%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$900.0M	$921.0M	$476.0M
YoY Change	91.08%	93.49%	-0.21%
LONG-TERM LIABILITIES
Long-Term Debt	$152.0M	$1.579B	$152.0M
YoY Change	0.0%	938.82%	-3.18%
Other Long-Term Liabilities			$260.0M
YoY Change			94.03%
Total Long-Term Liabilities	$152.0M	$1.579B	$412.0M
YoY Change	-62.84%	283.25%	41.58%
TOTAL LIABILITIES
Total Short-Term Liabilities	$900.0M	$921.0M	$476.0M
Total Long-Term Liabilities	$152.0M	$1.579B	$412.0M
Total Liabilities	$46.89B	$45.25B	$38.39B
YoY Change	19.68%	17.85%	10.23%
SHAREHOLDERS EQUITY
Retained Earnings	$4.000B	$3.876B	$3.546B
YoY Change	8.43%	9.3%	17.38%
Common Stock	$167.0K	$167.0K	$166.0K
YoY Change	0.0%	0.6%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$634.1M	$633.5M	$479.5M
YoY Change	32.14%	32.13%	6.0%
Treasury Stock Shares	25.68M shares	25.66M shares	20.99M shares
Shareholders Equity	$5.269B	$5.126B	$4.883B
YoY Change
Total Liabilities & Shareholders Equity	$52.16B	$50.37B	$43.27B
YoY Change	18.01%	16.4%	10.75%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$164.1M	$159.5M	$171.4M
YoY Change	-12.81%	-6.93%	0.07%
Depreciation, Depletion And Amortization	$23.80M	$27.20M	$31.10M
YoY Change	-41.95%	-12.54%	-7.16%
Cash From Operating Activities	$260.5M	$161.2M	$99.00M
YoY Change	-24.3%	62.83%	-61.69%
INVESTING ACTIVITIES
Capital Expenditures	-$2.700M		-$4.100M
YoY Change	92.86%		127.78%
Acquisitions
YoY Change
Other Investing Activities	-$2.351B	-$989.7M	-$867.6M
YoY Change	225.24%	14.07%	-26.27%
Cash From Investing Activities	-$2.353B	-$989.7M	-$871.6M
YoY Change	225.01%	13.55%	-26.04%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.587B	794.9M	205.3M
YoY Change	167.67%	287.19%	-76.15%
NET CHANGE
Cash From Operating Activities	260.5M	161.2M	99.00M
Cash From Investing Activities	-2.353B	-989.7M	-871.6M
Cash From Financing Activities	1.587B	794.9M	205.3M
Net Change In Cash	-506.4M	-33.60M	-567.3M
YoY Change	-338.08%	-94.08%	855.05%
FREE CASH FLOW
Cash From Operating Activities	$260.5M	$161.2M	$99.00M
Capital Expenditures	-$2.700M		-$4.100M
Free Cash Flow	$263.2M		$103.1M
YoY Change	-23.82%		-60.38%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001069157
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-24939
	dei	Entity Registrant Name EntityRegistrantName	EAST WEST BANCORP, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-4703316
	dei	Entity Address Address Line1 EntityAddressAddressLine1	135 North Los Robles Ave.
	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 Filer Category EntityFilerCategory	Large Accelerated Filer
	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 Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2019Q3	ewbc	Depositaccountfees Depositaccountfees	9729000	USD
	ewbc	Depositaccountfees Depositaccountfees	33892000	USD
	ewbc	Depositaccountfees Depositaccountfees	28804000	USD
CY2020Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	3310000	USD
CY2019Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	8065000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	15691000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	20366000	USD
CY2020Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	4553000	USD
CY2019Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	4841000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	12997000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	12415000	USD
CY2020Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	5538000	USD
CY2019Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	8423000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	18718000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	22037000	USD
CY2020Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	361000	USD
CY2019Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2037000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3590000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1443000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2967000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	698000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	58000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11867000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3066000	USD
CY2020Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	316000	USD
CY2019Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	663000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	3203000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	2571000	USD
CY2020Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3495000	USD
CY2019Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2623000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8000000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7711000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	49580000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	51474000	USD
	us-gaap	Noninterest Income NoninterestIncome	162266000	USD
	us-gaap	Noninterest Income NoninterestIncome	146364000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	99756000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	97819000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	298671000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	300649000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	16648000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	17912000	USD
	us-gaap	Occupancy Net OccupancyNet	49941000	USD
	us-gaap	Occupancy Net OccupancyNet	52592000	USD
CY2020Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4006000	USD
CY2019Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3550000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11133000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9557000	USD
CY2020Q3	us-gaap	Legal Fees LegalFees	1366000	USD
CY2019Q3	us-gaap	Legal Fees LegalFees	1720000	USD
	us-gaap	Legal Fees LegalFees	6093000	USD
	us-gaap	Legal Fees LegalFees	6300000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	57489000	USD
CY2019Q3	ewbc	Computer Software Expense ComputerSoftwareExpense	6556000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	22006000	USD
CY2019Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3328000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11896000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9945000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	1224000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	2559000	USD
	us-gaap	Professional Fees ProfessionalFees	3854000	USD
	us-gaap	Professional Fees ProfessionalFees	6687000	USD
CY2020Q3	ewbc	Depositrelatedexpenses Depositrelatedexpenses	3113000	USD
CY2019Q3	ewbc	Depositrelatedexpenses Depositrelatedexpenses	3584000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	10029000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	10426000	USD
CY2020Q3	ewbc	Computer Software Expense ComputerSoftwareExpense	8539000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	18845000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	17122000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22769000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	67737000	USD
CY2020Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	12286000	USD
CY2019Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	16833000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	54370000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	58477000	USD
CY2020Q3	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
CY2019Q3	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	8740000	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	167650000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	176630000	USD
	us-gaap	Noninterest Expense NoninterestExpense	534222000	USD
	us-gaap	Noninterest Expense NoninterestExpense	541215000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196060000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206367000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	472343000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	624635000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36523000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34951000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	68630000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	138815000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.34
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.82
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142043000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146120000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143082000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146088000	shares
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	171416000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	4634000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	11863000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	49903000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	62901000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	87000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-1246000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	5459000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2858000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	3065000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5694000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9005000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	57207000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169717000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	180421000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	455435000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	543027000	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	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40493000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4882664000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4987243000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8617000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39471000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	5126106000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4423974000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	57207000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	11348000	USD
	ewbc	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	4443000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.780
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	114796000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4882664000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	5017617000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	16395000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	145966000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	119408000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	5126106000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
	us-gaap	Net Income Loss NetIncomeLoss	485820000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	96089000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	103220000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	17974000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	12917000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	22201000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	23012000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-91000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2434000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	80108000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1443000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2967000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11867000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3066000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	53911000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	6341000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	50339000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	6341000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4934000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	103284000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-367971000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	204474000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3012000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	465210000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	363187000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	216992000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	77693000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	529000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	725000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	26901000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-96801000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	430614000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	389019000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	102190000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	400000000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	300000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	500000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	125000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	494877000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	476231000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1532411000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	283974000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3167863000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1219300000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	254035000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	224662000	USD
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	163861000	USD
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	395502000	USD
	ewbc	Payments To Acquire Other Financing Receivables PaymentsToAcquireOtherFinancingReceivables	2775014000	USD
	ewbc	Payments To Acquire Other Financing Receivables PaymentsToAcquireOtherFinancingReceivables	1509235000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1883000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2260000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8504000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	2601000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	4563000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1846000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1897000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4395198000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1868818000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4271838000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1252237000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	30916000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-9035000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	10200000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1500000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100200000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1082000000	USD
	ewbc	Proceeds From Repurchase Agreements ProceedsFromRepurchaseAgreements	48063000	USD
	ewbc	Proceeds From Repurchase Agreements ProceedsFromRepurchaseAgreements	0	USD
	ewbc	Repayments Of Repurchase Agreement RepaymentsOfRepurchaseAgreement	150000000	USD
	ewbc	Repayments Of Repurchase Agreement RepaymentsOfRepurchaseAgreement	0	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	8740000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	1437269000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	10609000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	658000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	145966000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1170000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1895000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7656000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	14230000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	119185000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	114986000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5257100000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1533223000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-46724000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-12520000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1245792000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	40904000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3261149000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3001377000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4506941000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3042281000	USD
	us-gaap	Interest Paid Net InterestPaidNet	188657000	USD
	us-gaap	Interest Paid Net InterestPaidNet	313793000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	82114000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	116074000	USD
	ewbc	Transferof Portfolioand Leasesto Heldforsale Including Loans Transferredfrom Heldfor Investmentto Branch Assets Heldforsale TransferofPortfolioandLeasestoHeldforsaleIncludingLoansTransferredfromHeldforInvestmenttoBranchAssetsHeldforsale	253302000	USD
	ewbc	Transferof Portfolioand Leasesto Heldforsale Including Loans Transferredfrom Heldfor Investmentto Branch Assets Heldforsale TransferofPortfolioandLeasestoHeldforsaleIncludingLoansTransferredfromHeldforInvestmenttoBranchAssetsHeldforsale	222434000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	19504000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2013000	USD
CY2020Q3	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	6	trust
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	348100000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	348100000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000.0	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	250000000.0	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1210000000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1110000000	USD
CY2020Q3	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0172
CY2019Q3	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0259
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0209
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0271
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	348100000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	348100000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000.0	USD
CY2020Q3	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0270
CY2019Q3	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0468
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0348
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0487
CY2020Q2	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	8700000	USD
CY2020Q2	ewbc	Extinguishment Of Securities Sold Under Agreements To Repurchase Amount ExtinguishmentOfSecuritiesSoldUnderAgreementsToRepurchaseAmount	150000000.0	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
CY2020Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturing Remainder Of Year SecuritiesSoldUnderAgreementsToRepurchaseMaturingRemainderOfYear	48100000	USD
CY2020Q3	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Three SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearThree	300000000.0	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1210000000	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	0	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1210000000	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities	1204933000	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Amount Offset Against Collateral SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	5067000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	348063000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	348063000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	330600000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	17463000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1110000000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	250000000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	860000000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities	856058000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Amount Offset Against Collateral SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	3942000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	250000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	200000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	200000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4471694000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	92913000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	25447000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3320648000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	19805000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4539160000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	23239000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3317214000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1506992000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	23670000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	90974000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1777000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1597966000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	25447000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1388661000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	18990000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	351048000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	4249000	USD
CY2019Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	17000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	3508000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	11867000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3066000	USD
CY2020Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	206000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1739709000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	23239000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	96	security
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	101	security
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	10497000	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101129000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	494877000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	476231000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	698000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	58000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	906000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	756955000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	757035000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	383722000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	388413000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	440452000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	451219000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	2890565000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	2942493000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4471694000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4539160000	USD
CY2020Q3	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	710400000	USD
CY2019Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	479400000	USD
CY2020Q3	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	58990000	USD
CY2019Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	58330000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	20182000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	20250000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	79172000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	78580000	USD
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	708610000	USD
CY2020Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	506019000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	330316000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	256528000	USD
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	104456000	USD
CY2020Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	104456000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	121561000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	121561000	USD
CY2020Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	5240000	USD
CY2020Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	97675000	USD
CY2019Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	3758000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	38238000	USD
CY2020Q3	us-gaap	Derivative Assets DerivativeAssets	598914000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	303888000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	204997000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	96729000	USD
	us-gaap	Derivatives Methods Of Accounting Hedging Derivatives DerivativesMethodsOfAccountingHedgingDerivatives	For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income.
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	708610000	USD
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	104456000	USD
CY2020Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	5240000	USD
CY2020Q3	us-gaap	Derivative Assets DerivativeAssets	598914000	USD
CY2020Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	8647000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	590267000	USD
CY2020Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	506019000	USD
CY2020Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	104456000	USD
CY2020Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	97675000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	303888000	USD
CY2020Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	262165000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	41723000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	330316000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	121561000	USD
CY2019Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	3758000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	204997000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	204997000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	256528000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	121561000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	38238000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	96729000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	79619000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	17110000	USD
CY2020Q3	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	695600000	USD
CY2019Q4	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	328700000	USD
CY2020Q3	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	13000000.0	USD
CY2019Q4	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	1600000	USD
CY2020Q3	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	505800000	USD
CY2019Q4	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	256500000	USD
CY2020Q3	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	208000	USD
CY2019Q4	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	20000	USD
CY2020Q3	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	9100000	USD
CY2019Q4	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	3800000	USD
CY2020Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	5200000	USD
CY2019Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	3800000	USD
CY2020Q3	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	100100000	USD
CY2019Q4	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	43000000.0	USD
CY2020Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	97700000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	38200000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	37437129000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	34778539000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	618252000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358287000	USD
CY2020Q3	us-gaap	Notes Receivable Net NotesReceivableNet	36818877000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	34420252000	USD
CY2020Q3	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-67000000.0	USD
CY2019Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-43200000	USD
CY2020Q3	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	108100000	USD
CY2019Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	121800000	USD
CY2020Q3	ewbc	Net Reductionto Interest Income NetReductiontoInterestIncome	-1200000	USD
	ewbc	Net Reductionto Interest Income NetReductiontoInterestIncome	-2600000	USD
CY2020Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	18000	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	29000	USD
CY2020Q3	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	27060000000.00	USD
CY2019Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	22430000000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Credit Quality Indicators</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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 borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings.</span></div>For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass”, with loans risk rated 1 being fully secured by cash or U.S. government and its agencies. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention”. Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard”. Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful”. Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss”. The Company reviews the internal risk ratings of its loan portfolio on a regular and ongoing basis, and adjusts the ratings based on changes in the borrowers’ financial status and the collectability of the loans.
CY2020Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	7749499000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	7856988000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	5429370000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3282850000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1627630000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3277666000	USD
CY2020Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	7971940000	USD
CY2020Q3	ewbc	Financing Receivable Revolving Convertedto Term Loans FinancingReceivableRevolvingConvertedtoTermLoans	241186000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	37437129000	USD
CY2020Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	18132000	USD
CY2019Q3	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	49040000	USD
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	115884000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	102181000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	12528000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	58036000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	102181000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	16309000	USD
CY2020Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	5000000.0	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	2200000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10000000	USD
CY2019Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	55663000	USD
CY2019Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	68965000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	253302000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	163822000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	38284000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	80108000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	618300000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	260000000.0	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358300000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186300000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10000000.0	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358287000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	34778539000	USD
CY2020Q3	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	89394000	USD
CY2020Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	124084000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	306342000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	37115643000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	84992000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	236494000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	37437129000	USD
CY2020Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	169528000	USD
CY2020Q3	ewbc	Financing Receivable Foreclosed Assets FinancingReceivableForeclosedAssets	23400000	USD
CY2019Q4	ewbc	Financing Receivable Foreclosed Assets FinancingReceivableForeclosedAssets	1300000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	9	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	66027000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	58036000	USD
CY2020Q3	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	12129000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	14	loan
	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
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2800000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2800000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	36000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	426000	USD
CY2020Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	361000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1400000	USD
CY2019Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2000000.0	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3000000.0	USD
	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
CY2020Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	192913000	USD
CY2019Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	207037000	USD
CY2020Q3	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	58695000	USD
CY2019Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	80294000	USD
CY2020Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11402000	USD
CY2019Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11539000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	34205000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	34871000	USD
CY2020Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	8975000	USD
CY2019Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	8452000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	26507000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	27006000	USD
CY2020Q3	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	254512000	USD
CY2019Q4	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	254140000	USD
CY2020Q3	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	107583000	USD
CY2019Q4	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	113515000	USD
CY2020Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	12300000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	54400000	USD
CY2019Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	16800000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	58500000	USD
CY2020Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	55000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	813000	USD
CY2019Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	188000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	955000	USD
CY2019Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2020Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2020Q3	us-gaap	Goodwill Goodwill	465700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	465700000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020Q3	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	465547000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	465697000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q3	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5451060000	USD
CY2019Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5330211000	USD
CY2020Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2118278000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1860414000	USD
CY2020Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2120000000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1860000000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	17126000	USD
CY2020Q3	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	32454000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	49580000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	14570000	USD
CY2019Q3	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	36904000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	51474000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	46889000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	115377000	USD
	us-gaap	Noninterest Income NoninterestIncome	162266000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	41219000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	105145000	USD
	us-gaap	Noninterest Income NoninterestIncome	146364000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	0	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	0	USD
CY2020Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	7921000	USD
CY2019Q3	us-gaap	Share Based Compensation ShareBasedCompensation	7487000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	22201000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	23012000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-14000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-1589000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4723000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	159537000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	171416000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	403713000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	485820000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	403713000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.34
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	159537000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	171416000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	485820000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145559000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145455000	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	545000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	561000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	487000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	633000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142043000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146120000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143082000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146088000	shares
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.82
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
CY2020Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	500000000.0	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4471682	shares
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	32.64
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	146000000.0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	11146000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	966000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
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
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	71435000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	19713000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	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	Number Of Reportable Segments NumberOfReportableSegments	3	segment
	ewbc	Numberof Core Segment NumberofCoreSegment	2	segment
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	324130000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10000000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	49580000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	167650000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196060000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2020Q3	us-gaap	Assets Assets	50371477000	USD
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
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1030612000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
	us-gaap	Noninterest Income NoninterestIncome	162266000	USD
	us-gaap	Noninterest Expense NoninterestExpense	534222000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	472343000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
CY2020Q3	us-gaap	Assets Assets	50371477000	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

Files In Submission

Name	View Source	Status
0001069157-20-000072-index-headers.html	Edgar Link	pending
0001069157-20-000072-index.html	Edgar Link	pending
0001069157-20-000072.txt	Edgar Link	pending
0001069157-20-000072-xbrl.zip	Edgar Link	pending
ewbc-20200930.htm	Edgar Link	pending
ewbc-20200930.xsd	Edgar Link	pending
ewbc-20200930_cal.xml	Edgar Link	unprocessable
ewbc-20200930_def.xml	Edgar Link	unprocessable
ewbc-20200930_g1.jpg	Edgar Link	pending
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ewbc-20200930_htm.xml	Edgar Link	completed
ewbc-20200930_lab.xml	Edgar Link	unprocessable
ewbc-20200930_pre.xml	Edgar Link	unprocessable
ewbc10110q9302020.htm	Edgar Link	pending
ewbc10210q9302020.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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$EWBC
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2020 Q4 Form 10-Q Financial Statement

#000106915720000072 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC EAST WEST BANCORP INC Stock $ewbc

2020 Q4 Form 10-Q Financial Statement

#000106915720000072 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc