$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000106915720000048 Filed on August 07, 2020

Income Statement

Concept	2020 Q2	2019 Q2	2019 Q1
Revenue	$398.8M	$474.8M	$463.3M
YoY Change	-16.02%	18.62%	24.59%
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	$37.70M	$32.60M	$39.50M
YoY Change	15.64%	0.62%	32.29%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$55.00M	$107.5M	$100.9M
YoY Change	-48.84%	83.38%	123.22%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$112.3M	$223.2M	$195.1M
YoY Change	-49.69%	13.29%	-7.88%
Income Tax	$12.92M	$72.80M	$31.07M
% Of Pretax Income	11.51%	32.62%	15.92%
Net Earnings	$99.35M	$150.4M	$164.0M
YoY Change	-33.93%	-12.75%	-12.3%
Net Earnings / Revenue	24.91%	31.67%	35.4%
Basic Earnings Per Share	$0.70	$1.03	$1.13
Diluted Earnings Per Share	$0.70	$1.03	$1.12
COMMON SHARES
Basic Shares Outstanding	141.5M shares	145.5M shares	145.3M shares
Diluted Shares Outstanding	141.8M shares	146.1M shares	145.9M shares

Balance Sheet

Concept	2020 Q2	2019 Q2	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$4.534B	$3.622B	$3.785B
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	$110.7M	$121.5M	$124.3M
YoY Change	-8.88%	-0.47%	3.81%
Goodwill	$465.7M	$465.7M	$465.7M
YoY Change	0.0%	0.03%	0.03%
Intangibles
YoY Change
Long-Term Investments	$202.0M	$198.0M	$197.0M
YoY Change	2.02%	29.41%	22.36%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$49.41B	$42.89B	$42.09B
YoY Change	15.19%	12.75%	11.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$397.0M	$540.0M	$529.0M
YoY Change	-26.48%	14.16%	18.08%
Deferred Revenue
YoY Change
Short-Term Debt	$553.0M	$19.97M	$39.55M
YoY Change	2668.88%	-65.87%	30.63%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$397.0M	$540.0M	$529.0M
YoY Change	-26.48%	14.16%	18.08%
LONG-TERM LIABILITIES
Long-Term Debt	$1.580B	$153.0M	$152.0M
YoY Change	932.68%	-5.56%	-8.98%
Other Long-Term Liabilities	$560.0M	$173.0M	$110.0M
YoY Change	223.7%	50.43%	26.44%
Total Long-Term Liabilities	$2.140B	$326.0M	$262.0M
YoY Change	556.44%	17.69%	3.15%
TOTAL LIABILITIES
Total Short-Term Liabilities	$397.0M	$540.0M	$529.0M
Total Long-Term Liabilities	$2.140B	$326.0M	$262.0M
Total Liabilities	$44.42B	$38.16B	$37.50B
YoY Change	16.41%	12.37%	11.23%
SHAREHOLDERS EQUITY
Retained Earnings	$3.756B	$3.415B	$3.305B
YoY Change	9.98%	18.44%	20.61%
Common Stock	$167.0K	$166.0K	$166.0K
YoY Change	0.6%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$633.5M	$479.4M	$479.3M
YoY Change	32.14%	5.98%	5.96%
Treasury Stock Shares	25.66M shares	20.99M shares	20.98M shares
Shareholders Equity	$4.987B	$4.735B	$4.592B
YoY Change
Total Liabilities & Shareholders Equity	$49.41B	$42.89B	$42.09B
YoY Change	15.19%	12.66%	11.67%

Cashflow Statement

Concept	2020 Q2	2019 Q2	2019 Q1
OPERATING ACTIVITIES
Net Income	$99.35M	$150.4M	$164.0M
YoY Change	-33.93%	-12.75%	-12.3%
Depreciation, Depletion And Amortization	$37.70M	$32.60M	$39.50M
YoY Change	15.64%	0.62%	32.29%
Cash From Operating Activities	$179.2M	$150.8M	$139.2M
YoY Change	18.83%	-30.51%	-36.09%
INVESTING ACTIVITIES
Capital Expenditures		-$1.100M	$3.336M
YoY Change		-81.03%	89.87%
Acquisitions
YoY Change
Other Investing Activities	-$2.126B	-$877.4M	$729.0K
YoY Change	142.33%	104.33%	-62.94%
Cash From Investing Activities	-$2.125B	-$878.5M	-$118.7M
YoY Change	141.92%	101.81%	-88.59%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	3.409B	578.5M	$749.4M
YoY Change	489.2%	153.51%	-20.65%
NET CHANGE
Cash From Operating Activities	179.2M	150.8M	$139.2M
Cash From Investing Activities	-2.125B	-878.5M	-$118.7M
Cash From Financing Activities	3.409B	578.5M	$749.4M
Net Change In Cash	1.462B	-149.2M	$783.9M
YoY Change	-1080.16%	-1607.07%	458.58%
FREE CASH FLOW
Cash From Operating Activities	$179.2M	$150.8M	$139.2M
Capital Expenditures		-$1.100M	$3.336M
Free Cash Flow		$151.9M	$135.9M
YoY Change		-31.82%	-37.11%

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	Q2
	dei	Amendment Flag AmendmentFlag	false
CY2018	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201602Member
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
	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	2020-06-30
	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 Address Postal Zip Code EntityAddressPostalZipCode	91101
	dei	City Area Code CityAreaCode	626
	dei	Local Phone Number LocalPhoneNumber	768-6000
	dei	Security12b Title Security12bTitle	Common Stock, $0.001 Par Value
	dei	Trading Symbol TradingSymbol	EWBC
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	ewbc	Lendingfees Lendingfees	37719000	USD
	ewbc	Lendingfees Lendingfees	31392000	USD
CY2020Q2	ewbc	Depositaccountfees Depositaccountfees	10872000	USD
CY2019Q2	ewbc	Depositaccountfees Depositaccountfees	9607000	USD
	ewbc	Depositaccountfees Depositaccountfees	21319000	USD
	ewbc	Depositaccountfees Depositaccountfees	19075000	USD
CY2020Q2	ewbc	Foreignexchangeincome Foreignexchangeincome	4562000	USD
CY2019Q2	ewbc	Foreignexchangeincome Foreignexchangeincome	7286000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	12381000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	12301000	USD
CY2020Q2	ewbc	Wealthmanagementfees Wealthmanagementfees	3091000	USD
CY2019Q2	ewbc	Wealthmanagementfees Wealthmanagementfees	3800000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	8444000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	7574000	USD
CY2020Q2	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	6107000	USD
CY2019Q2	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	10398000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	13180000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	13614000	USD
CY2020Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	132000	USD
CY2019Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	15000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1082000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	930000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	9640000	USD
CY2019Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	1447000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11169000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3008000	USD
CY2020Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	966000	USD
CY2019Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	706000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	2887000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	1908000	USD
CY2020Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1321000	USD
CY2019Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3077000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4505000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5088000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	58637000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	52759000	USD
	us-gaap	Noninterest Income NoninterestIncome	112686000	USD
	us-gaap	Noninterest Income NoninterestIncome	94890000	USD
CY2020Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	96955000	USD
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	100531000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	198915000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	202830000	USD
CY2020Q2	us-gaap	Occupancy Net OccupancyNet	16217000	USD
CY2019Q2	us-gaap	Occupancy Net OccupancyNet	17362000	USD
	us-gaap	Occupancy Net OccupancyNet	33293000	USD
	us-gaap	Occupancy Net OccupancyNet	34680000	USD
CY2020Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3700000	USD
CY2019Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2919000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	7127000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6007000	USD
CY2020Q2	us-gaap	Legal Fees LegalFees	1530000	USD
CY2019Q2	us-gaap	Legal Fees LegalFees	2355000	USD
	us-gaap	Legal Fees LegalFees	4727000	USD
	us-gaap	Legal Fees LegalFees	4580000	USD
CY2020Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	4480000	USD
CY2019Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3460000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	8306000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6617000	USD
CY2020Q2	us-gaap	Professional Fees ProfessionalFees	1413000	USD
CY2019Q2	us-gaap	Professional Fees ProfessionalFees	2069000	USD
	us-gaap	Professional Fees ProfessionalFees	2630000	USD
	us-gaap	Professional Fees ProfessionalFees	4128000	USD
CY2020Q2	ewbc	Depositrelatedexpenses Depositrelatedexpenses	3353000	USD
CY2019Q2	ewbc	Depositrelatedexpenses Depositrelatedexpenses	3338000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	6916000	USD
	ewbc	Depositrelatedexpenses Depositrelatedexpenses	6842000	USD
CY2020Q2	ewbc	Computer Software Expense ComputerSoftwareExpense	7301000	USD
CY2019Q2	ewbc	Computer Software Expense ComputerSoftwareExpense	6211000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	13467000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	12289000	USD
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19248000	USD
CY2019Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22679000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	40367000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	44968000	USD
CY2020Q2	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	24759000	USD
CY2019Q2	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	16739000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	42084000	USD
CY2019Q2	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	41644000	USD
CY2020Q2	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	8740000	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	187696000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	177663000	USD
	us-gaap	Noninterest Expense NoninterestExpense	366572000	USD
	us-gaap	Noninterest Expense NoninterestExpense	364585000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	112273000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	223177000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	276283000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	418268000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12921000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	72797000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	32107000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	103864000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	99352000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	150380000	USD
	us-gaap	Net Income Loss NetIncomeLoss	244176000	USD
	us-gaap	Net Income Loss NetIncomeLoss	314404000	USD
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.16
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141486000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145546000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	143150000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145402000	shares
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	41542000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	48202000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141827000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146052000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143560000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146016000	shares
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	99352000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	150380000	USD
	us-gaap	Net Income Loss NetIncomeLoss	244176000	USD
	us-gaap	Net Income Loss NetIncomeLoss	314404000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	17816000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	29027000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	45269000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	51038000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-1333000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-1333000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-230000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-6016000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2394000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2836000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16253000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	23011000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4423974000	USD
	us-gaap	Net Income Loss NetIncomeLoss	314404000	USD
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39462000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4987243000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	115605000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	173391000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	285718000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	362606000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	4591930000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	150380000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	23011000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	9805000	USD
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40533000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4734593000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	4902985000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	99352000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16253000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8115000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	68926000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	48202000	USD
	ewbc	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	4443000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3205000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.505
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	74303000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4734593000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	5017617000	USD
	us-gaap	Net Income Loss NetIncomeLoss	244176000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	41542000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7778000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	145966000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.550
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	79937000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4987243000	USD
	us-gaap	Net Income Loss NetIncomeLoss	244176000	USD
	us-gaap	Net Income Loss NetIncomeLoss	314404000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	72113000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	18901000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	9817000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	14280000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	15525000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-111000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2110000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	176313000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	41824000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1082000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	930000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11169000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	3008000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	21791000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	3339000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	18386000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	3632000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	1107000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	1538000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	456374000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	150154000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	257397000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	10320000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-241000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	3000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	26740000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-24403000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	270916000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	290001000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	68884000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	61555000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-315497000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	222387000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	350000000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	50000000	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	25000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	484380000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	375102000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	848633000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	117325000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1834087000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	316740000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	144015000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	170174000	USD
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	145695000	USD
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	326456000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	2475089000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1196094000	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	1846000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4414000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1948000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	3636000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	374000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5516000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3510613000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-997151000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	3355168000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1035650000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	225834000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-38107000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	10100000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1500000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100099000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1082000000	USD
	ewbc	Repayments Of Repurchase Agreement RepaymentsOfRepurchaseAgreement	150000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-15470000	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	9320000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	435000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	145965000	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	1894000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7626000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	14169000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	80271000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	74949000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	4527520000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1327884000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-497000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1272353000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	620237000	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
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4533502000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3621614000	USD
	us-gaap	Interest Paid Net InterestPaidNet	145723000	USD
	us-gaap	Interest Paid Net InterestPaidNet	203577000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5609000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	76153000	USD
	ewbc	Transferof Portfolioand Leasesto Heldforsale Including Loans Transferredfrom Heldfor Investmentto Branch Assets Heldforsale TransferofPortfolioandLeasestoHeldforsaleIncludingLoansTransferredfromHeldforInvestmenttoBranchAssetsHeldforsale	143283000	USD
	ewbc	Transferof Portfolioand Leasesto Heldforsale Including Loans Transferredfrom Heldfor Investmentto Branch Assets Heldforsale TransferofPortfolioandLeasestoHeldforsaleIncludingLoansTransferredfromHeldforInvestmenttoBranchAssetsHeldforsale	173394000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	19504000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	USD
CY2020Q2	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	6	trust
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000.0	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000.0	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
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1260000000	USD
CY2019Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1110000000	USD
CY2020Q2	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0214
CY2019Q2	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0271
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0232
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0232
	ewbc	Assets Purchased Under Agreementsto Resell Yield AssetsPurchasedUnderAgreementstoResellYield	0.0277
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000.0	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000.0	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	450000000.0	USD
CY2020Q2	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0340
CY2019Q2	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0493
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0376
	ewbc	Assets Purchased Under Agreementsto Repurchase Interest Rate AssetsPurchasedUnderAgreementstoRepurchaseInterestRate	0.0497
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	8700000	USD
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	Extinguishment Of Securities Sold Under Agreements To Repurchase Amount ExtinguishmentOfSecuritiesSoldUnderAgreementsToRepurchaseAmount	150000000.0	USD
CY2020Q2	ewbc	Securities Sold Under Agreements To Repurchase Maturingin Year Four SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearFour	300000000.0	USD
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1260000000	USD
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	0	USD
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1260000000	USD
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities	1258866000	USD
CY2020Q2	us-gaap	Securities Purchased Under Agreements To Resell Amount Offset Against Collateral SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	1134000	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	300000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	4249000	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	300000000	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	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
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3823714000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	90565000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	29705000	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
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	41	security
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	101	security
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3884574000	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
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
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	725825000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	25946000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	64527000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	3759000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	790352000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	29705000	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
CY2020Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	177917000	USD
CY2019Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	223763000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	484380000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	375102000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	9640000	USD
CY2019Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1447000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	11169000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3008000	USD
CY2020Q2	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	2850000	USD
CY2019Q2	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	428000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	3302000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	889000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	561935000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	562869000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	366403000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	371895000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	277823000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	289730000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	2617553000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	2660080000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3823714000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3884574000	USD
CY2020Q2	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	745200000	USD
CY2019Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	479400000	USD
CY2020Q2	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	58781000	USD
CY2019Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	58330000	USD
CY2020Q2	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	20182000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	20250000	USD
CY2020Q2	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	78963000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	78580000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	764430000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	560169000	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
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	110569000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	110569000	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
CY2020Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	11649000	USD
CY2020Q2	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	94435000	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
CY2020Q2	us-gaap	Derivative Assets DerivativeAssets	642212000	USD
CY2020Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	355165000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	204997000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	96729000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	764430000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	110569000	USD
CY2020Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	11649000	USD
CY2020Q2	us-gaap	Derivative Assets DerivativeAssets	642212000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	96729000	USD
CY2020Q2	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	13447000	USD
CY2020Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	355165000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	628765000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	560169000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	110569000	USD
CY2020Q2	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	94435000	USD
CY2020Q2	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	279528000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	75637000	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	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	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 Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	79619000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	17110000	USD
CY2020Q2	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	754700000	USD
CY2019Q4	ewbc	Derivative Assets Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized	328700000	USD
CY2020Q2	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	9700000	USD
CY2019Q4	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	1600000	USD
CY2020Q2	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	560000000.0	USD
CY2019Q4	ewbc	Derivative Liability Subject To Master Netting Arrangements Gross Amounts Recognized DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized	256500000	USD
CY2020Q2	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	211000	USD
CY2019Q4	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	20000	USD
CY2020Q2	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	18100000	USD
CY2019Q4	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	3800000	USD
CY2020Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	11600000	USD
CY2019Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	3800000	USD
CY2020Q2	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	98900000	USD
CY2019Q4	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	43000000.0	USD
CY2020Q2	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	94400000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	38200000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358287000	USD
CY2020Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	37229412000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	34778539000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	632071000	USD
CY2020Q2	us-gaap	Notes Receivable Net NotesReceivableNet	36597341000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	34420252000	USD
CY2020Q2	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-72100000	USD
CY2019Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-43200000	USD
CY2020Q2	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	111800000	USD
CY2019Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	121800000	USD
CY2020Q2	ewbc	Net Reductionto Interest Income NetReductiontoInterestIncome	-1200000	USD
	ewbc	Net Reductionto Interest Income NetReductiontoInterestIncome	-1600000	USD
CY2020Q2	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	10000	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	12000	USD
CY2020Q2	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	27410000000	USD
CY2019Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	22430000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	5896909000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-indent:36pt;text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);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-indent:36pt;text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);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><div style="text-align:justify;"><span><br/></span></div><div style="text-indent:36pt;text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">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 securities. 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 for its loan portfolio on a regular and ongoing basis and make adjustments to the risk ratings based on changes in the borrowers’ financial status and the collectability of the loans.</span></div>
CY2020Q2	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	8429073000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	5796044000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3409990000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1712616000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3798982000	USD
CY2020Q2	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	7993253000	USD
CY2020Q2	ewbc	Financing Receivable Revolving Convertedto Term Loans FinancingReceivableRevolvingConvertedtoTermLoans	192545000	USD
CY2020Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	37229412000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	36937442000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	113150000	USD
CY2020Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	141019000	USD
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	178820000	USD
CY2020Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	37229412000	USD
CY2020Q2	ewbc	Financing Receivable Foreclosed Assets FinancingReceivableForeclosedAssets	23400000	USD
CY2019Q4	ewbc	Financing Receivable Foreclosed Assets FinancingReceivableForeclosedAssets	1300000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	loan
CY2020Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	35260000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	28926000	USD
CY2020Q2	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	872000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	6	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	51708000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	43833000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	1000000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	28926000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	43833000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
CY2020Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	17160000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	17160000	USD
CY2020Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	4500000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	2200000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	102443000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	19245000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	176313000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358287000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	41824000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	632100000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	273800000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	358300000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	102400000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	176300000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	34778539000	USD
CY2020Q2	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	33060000	USD
CY2020Q2	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	46768000	USD
CY2020Q2	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	12510000	USD
CY2019Q2	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	81166000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	145690000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	173394000	USD
CY2019Q2	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	78776000	USD
CY2019Q2	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	178471000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	143283000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	161633000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	173519000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	326285000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	0	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	0	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	317000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	390000	USD
CY2020Q2	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	132000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1100000	USD
CY2019Q2	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	15000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	930000	USD
	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
CY2020Q2	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	720000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	758000	USD
CY2019Q2	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	375000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	767000	USD
CY2020Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	18800000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	19100000	USD
CY2019Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2020Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	201888000	USD
CY2019Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	207037000	USD
CY2020Q2	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	72655000	USD
CY2019Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	80294000	USD
CY2020Q2	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11772000	USD
CY2019Q2	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11506000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	22803000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	23332000	USD
CY2020Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	9148000	USD
CY2019Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	9657000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	17532000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	18554000	USD
CY2020Q2	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	251318000	USD
CY2019Q4	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	254140000	USD
CY2020Q2	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	106969000	USD
CY2019Q4	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	113515000	USD
CY2020Q2	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	24800000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	42100000	USD
CY2019Q2	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	16700000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	41600000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2020Q2	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2020Q2	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
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	465700000	USD
CY2020Q2	us-gaap	Goodwill Goodwill	465700000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	465547000	USD
CY2019Q2	us-gaap	Goodwill Goodwill	465697000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	0	USD
CY2020Q2	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5131120000	USD
CY2019Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5330211000	USD
CY2020Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2005402000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1860414000	USD
CY2020Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2010000000.00	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13963000	USD
CY2020Q2	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	44674000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	58637000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13407000	USD
CY2019Q2	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	39352000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	52759000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	29763000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	82923000	USD
	us-gaap	Noninterest Income NoninterestIncome	112686000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	26649000	USD
	ewbc	Other Sources Of Noninterest Income OtherSourcesOfNoninterestIncome	68241000	USD
	us-gaap	Noninterest Income NoninterestIncome	94890000	USD
CY2020Q2	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	0	USD
CY2020Q2	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	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2020Q2	us-gaap	Share Based Compensation ShareBasedCompensation	7071000	USD
CY2019Q2	us-gaap	Share Based Compensation ShareBasedCompensation	8081000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	14280000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	15525000	USD
CY2020Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-9000	USD
CY2019Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-1575000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4708000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	99352000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	150380000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	244176000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	314404000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141486000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145546000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	143150000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145402000	shares
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.16
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	99352000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	150380000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	244176000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	314404000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141486000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145546000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	143150000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	145402000	shares
CY2020Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	341000	shares
CY2019Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	506000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	410000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	614000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141827000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146052000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143560000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	146016000	shares
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
CY2020Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	500000000.0	USD
	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
CY2020Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	23091000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	6838000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16253000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	40095000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	17084000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	23011000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	60289000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	18747000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	41542000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	72652000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	24450000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	48202000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
	ewbc	Numberof Core Segment NumberofCoreSegment	2	segment
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	343775000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	102443000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	58637000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	187696000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	112273000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	99352000	USD
CY2020Q2	us-gaap	Assets Assets	49407593000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	367326000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	19245000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	52759000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	177663000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	223177000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	150380000	USD
CY2019Q2	us-gaap	Assets Assets	42892358000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	706482000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	176313000	USD
	us-gaap	Noninterest Income NoninterestIncome	112686000	USD
	us-gaap	Noninterest Expense NoninterestExpense	366572000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	276283000	USD
	us-gaap	Net Income Loss NetIncomeLoss	244176000	USD
CY2020Q2	us-gaap	Assets Assets	49407593000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	729787000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	41824000	USD
	us-gaap	Noninterest Income NoninterestIncome	94890000	USD
	us-gaap	Noninterest Expense NoninterestExpense	364585000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	418268000	USD
	us-gaap	Net Income Loss NetIncomeLoss	314404000	USD
CY2019Q2	us-gaap	Assets Assets	42892358000	USD

Files In Submission

Name	View Source	Status
0001069157-20-000048-index-headers.html	Edgar Link	pending
0001069157-20-000048-index.html	Edgar Link	pending
0001069157-20-000048.txt	Edgar Link	pending
0001069157-20-000048-xbrl.zip	Edgar Link	pending
ewbc-20200630.htm	Edgar Link	pending
ewbc-20200630.xsd	Edgar Link	pending
ewbc-20200630_cal.xml	Edgar Link	unprocessable
ewbc-20200630_def.xml	Edgar Link	unprocessable
ewbc-20200630_g1.jpg	Edgar Link	pending
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ewbc-20200630_g9.jpg	Edgar Link	pending
ewbc-20200630_htm.xml	Edgar Link	completed
ewbc-20200630_lab.xml	Edgar Link	unprocessable
ewbc-20200630_pre.xml	Edgar Link	unprocessable
ewbc31110q6302020.htm	Edgar Link	pending
ewbc31210q6302020.htm	Edgar Link	pending
ewbc32110q6302020.htm	Edgar Link	pending
ewbc32210q6302020.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$EWBC
EAST WEST BANCORP INC Stock $ewbc

2020 Q2 Form 10-Q Financial Statement

#000106915720000048 Filed on August 07, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC EAST WEST BANCORP INC Stock $ewbc

2020 Q2 Form 10-Q Financial Statement

#000106915720000048 Filed on August 07, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc