$CATY
CATHAY GENERAL BANCORP Stock $caty

$caty Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000143774924005948 Filed on February 29, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$11.93M		$43.91M
YoY Change	19.74%		4.11%
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	$1.889M	$1.971M	$8.371M
YoY Change	-8.03%	-36.64%	-15.94%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$164.1M		$500.5M
YoY Change	76.51%		325.63%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$80.04M	$93.02M	$403.6M
YoY Change	-30.63%	-29.14%	-14.59%
Income Tax	$8.609M	$10.49M	$49.46M
% Of Pretax Income	10.76%	11.28%	12.25%
Net Earnings	$71.44M	$82.53M	$354.1M
YoY Change	-25.59%	-15.45%	-1.81%
Net Earnings / Revenue	598.99%		806.44%
Basic Earnings Per Share	$0.98		$4.88
Diluted Earnings Per Share	$0.98	$1.13	$4.86
COMMON SHARES
Basic Shares Outstanding	72.67M	72.65M	72.57M
Diluted Shares Outstanding	72.97M		72.86M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.176B	$828.8M
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	$122.2M	$123.2M	$123.2M
YoY Change	-0.78%	-0.99%	-0.99%
Goodwill	$375.7M	$375.7M
YoY Change	0.0%	0.0%
Intangibles	$4.131M	$4.461M
YoY Change	-25.75%	-22.51%
Long-Term Investments
YoY Change
Other Assets			$97.40M
YoY Change			-4.03%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$23.40B	$23.08B	$23.08B
YoY Change	6.23%	4.98%	4.98%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$34.33M	$34.80M	$34.80M
YoY Change	5.29%	7.01%	7.01%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due	$0.00	$0.00	$0.00
YoY Change
Total Short-Term Liabilities	$34.33M	$34.80M	$34.80M
YoY Change	5.29%	7.01%	7.01%
LONG-TERM LIABILITIES
Long-Term Debt	$136.7M	$134.9M	$134.9M
YoY Change	-3.48%	-4.81%	-4.81%
Other Long-Term Liabilities	$327.4M	$306.5M	$306.5M
YoY Change	9.26%	-11.1%	-11.1%
Total Long-Term Liabilities	$464.1M	$441.5M	$441.5M
YoY Change	5.17%	-9.27%	-9.27%
TOTAL LIABILITIES
Total Short-Term Liabilities	$34.33M	$34.80M	$34.80M
Total Long-Term Liabilities	$464.1M	$441.5M	$441.5M
Total Liabilities	$20.63B	$20.34B	$20.34B
YoY Change	5.84%	4.27%	4.27%
SHAREHOLDERS EQUITY
Retained Earnings	$2.547B	$2.500B
YoY Change	9.96%	11.38%
Common Stock	$914.0K	$914.0K
YoY Change	0.33%	0.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.778B	$2.737B	$2.737B
YoY Change
Total Liabilities & Shareholders Equity	$23.40B	$23.08B	$23.08B
YoY Change	6.23%	4.98%	4.98%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$71.44M	$82.53M	$354.1M
YoY Change	-25.59%	-15.45%	-1.81%
Depreciation, Depletion And Amortization	$1.889M	$1.971M	$8.371M
YoY Change	-8.03%	-36.64%	-15.94%
Cash From Operating Activities	$88.17M	$65.84M	$384.7M
YoY Change	-27.23%	-32.41%	-17.68%
INVESTING ACTIVITIES
Capital Expenditures	$916.0K	$1.801M	$3.401M
YoY Change	210.51%	506.4%	0.32%
Acquisitions			$0.00
YoY Change			-100.0%
Other Investing Activities	$38.02M	-$588.1M	-$1.474B
YoY Change	-129.67%	198.4%	-20.17%
Cash From Investing Activities	$37.10M	-$589.9M	-$1.477B
YoY Change	-128.89%	198.87%	-20.13%
FINANCING ACTIVITIES
Cash Dividend Paid	$24.71M		$98.64M
YoY Change	0.42%		-2.3%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$221.9M	189.9M	$758.7M
YoY Change	-1117.53%	-19343.87%	700.85%
NET CHANGE
Cash From Operating Activities	$88.17M	65.84M	$384.7M
Cash From Investing Activities	$37.10M	-589.9M	-$1.477B
Cash From Financing Activities	$221.9M	189.9M	$758.7M
Net Change In Cash	$347.1M	-334.1M	-$333.6M
YoY Change	-1294.05%	230.98%	-74.09%
FREE CASH FLOW
Cash From Operating Activities	$88.17M	$65.84M	$384.7M
Capital Expenditures	$916.0K	$1.801M	$3.401M
Free Cash Flow	$87.25M	$64.04M	$381.3M
YoY Change	-27.81%	-34.06%	-17.81%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
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CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1622173000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
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CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	91392480
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	72668927
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	91090614
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	72742151
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	18723553
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	18348463
CY2023Q4	caty	Variable Interest Entity Primary Beneficiary Number Of Entities VariableInterestEntityPrimaryBeneficiaryNumberOfEntities	10	pure
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	pure
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022	us-gaap	Debt Securities Held To Maturity Transfer To Available For Sale Allowance For Credit Loss Expense DebtSecuritiesHeldToMaturityTransferToAvailableForSaleAllowanceForCreditLossExpense	0	usd
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CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	usd
CY2023Q4	caty	Number Of Limited Partnerships Deemed To Be Variable Interest Entities NumberOfLimitedPartnershipsDeemedToBeVariableInterestEntities	11	pure
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	usd
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CY2023Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	119136000	usd
CY2022Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	119136000	usd
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2022	caty	Minimum Number Of Years Allowed To Participate In Employee Stock Ownership Plan MinimumNumberOfYearsAllowedToParticipateInEmployeeStockOwnershipPlan	P2Y
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-31830
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-4274680
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	777 North Broadway
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Los Angeles
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	90012
CY2023	dei	City Area Code CityAreaCode	213
CY2023	dei	Local Phone Number LocalPhoneNumber	625-4700
CY2023	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2023	dei	Trading Symbol TradingSymbol	CATY
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2023	dei	Auditor Name AuditorName	KPMG LLP
CY2023	dei	Auditor Location AuditorLocation	Los Angeles, California
CY2023	dei	Auditor Firm AuditorFirmId	185
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CY2023	us-gaap	Interest Expense InterestExpense	500476000	usd
CY2022	us-gaap	Interest Expense InterestExpense	117584000	usd
CY2021	us-gaap	Interest Expense InterestExpense	68756000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	741746000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	733697000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	597755000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	25978000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	14543000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-16008000	usd
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	715768000	usd
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	719154000	usd
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	613763000	usd
CY2023	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	18248000	usd
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	392000	usd
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1426000	usd
CY2023	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	-3000000	usd
CY2022	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	0	usd
CY2021	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	853000	usd
CY2023	caty	Letter Of Credit Commissions LetterOfCreditCommissions	6716000	usd
CY2022	caty	Letter Of Credit Commissions LetterOfCreditCommissions	6351000	usd
CY2021	caty	Letter Of Credit Commissions LetterOfCreditCommissions	7103000	usd
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	22390000	usd
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	27112000	usd
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	27433000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	68292000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	56814000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	54603000	usd
CY2023	us-gaap	Salaries Wages And Officers Compensation SalariesWagesAndOfficersCompensation	154149000	usd
CY2022	us-gaap	Salaries Wages And Officers Compensation SalariesWagesAndOfficersCompensation	142546000	usd
CY2021	us-gaap	Salaries Wages And Officers Compensation SalariesWagesAndOfficersCompensation	132795000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	22270000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	22808000	usd
CY2021	us-gaap	Occupancy Net OccupancyNet	20318000	usd
CY2023	us-gaap	Equipment Expense EquipmentExpense	17478000	usd
CY2022	us-gaap	Equipment Expense EquipmentExpense	13603000	usd
CY2021	us-gaap	Equipment Expense EquipmentExpense	13549000	usd
CY2023	us-gaap	Professional Fees ProfessionalFees	32491000	usd
CY2022	us-gaap	Professional Fees ProfessionalFees	28237000	usd
CY2021	us-gaap	Professional Fees ProfessionalFees	23666000	usd
CY2023	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	14728000	usd
CY2022	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	13181000	usd
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	13607000	usd
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	23588000	usd
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	8037000	usd
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	7132000	usd
CY2023	us-gaap	Marketing Expense MarketingExpense	5887000	usd
CY2022	us-gaap	Marketing Expense MarketingExpense	6863000	usd
CY2021	us-gaap	Marketing Expense MarketingExpense	6913000	usd
CY2023	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	761000	usd
CY2022	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	127000	usd
CY2021	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	343000	usd
CY2023	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	86616000	usd
CY2022	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	42065000	usd
CY2021	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	45447000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1310000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1892000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	687000	usd
CY2023	caty	Debt Redemption Cost DebtRedemptionCost	0	usd
CY2022	caty	Debt Redemption Cost DebtRedemptionCost	0	usd
CY2021	caty	Debt Redemption Cost DebtRedemptionCost	732000	usd
CY2023	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	671000	usd
CY2022	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	4127000	usd
CY2021	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	1425000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20529000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19946000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19909000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	380478000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	303432000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	286523000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	403582000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	472536000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	381843000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49458000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111894000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83539000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	354124000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	360642000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	298304000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	18642000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-105043000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-11989000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1763000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	5813000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	3614000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16879000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-99230000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8375000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	371003000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	261412000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	289929000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.88
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.85
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.86
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.83
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.8
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.36
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.36
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.27
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72573025
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74337265
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	78268369
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	72862628
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	74664735
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	78570638
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2418144000	usd
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3563000	usd
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2000	usd
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2632000	usd
CY2021	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	850000	usd
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	167104000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5960000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	99322000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-8375000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	298304000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	2446251000	usd
CY2022	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3719000	usd
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1000	usd
CY2022	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2905000	usd
CY2022	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	849000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	141315000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6983000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	100955000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-99230000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	360642000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2474040000	usd
CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3491000	usd
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2000	usd
CY2023	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4490000	usd
CY2023	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	850000	usd
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	16667000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6984000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	98638000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16879000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	354124000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2736575000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	354124000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	360642000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	298304000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	25978000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	14543000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-16008000	usd
CY2023	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	0	usd
CY2022	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	0	usd
CY2021	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	17000	usd
CY2023	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	4782000	usd
CY2022	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	2088000	usd
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-9168000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	8371000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9958000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7956000	usd
CY2023	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	9733000	usd
CY2022	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	9845000	usd
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	8160000	usd
CY2023	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	2279000	usd
CY2022	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-4629000	usd
CY2021	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-2790000	usd
CY2023	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-0	usd
CY2022	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	6000	usd
CY2021	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	57000	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	-0	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1000	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	357000	usd
CY2023	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	0	usd
CY2022	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	33000	usd
CY2021	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	5351000	usd
CY2023	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	-0	usd
CY2022	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	-0	usd
CY2021	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	4994000	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-6000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-67000	usd
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-55000	usd
CY2023	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	86616000	usd
CY2022	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	42065000	usd
CY2021	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	45447000	usd
CY2023	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-0	usd
CY2022	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	101000	usd
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	853000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	11373000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2465000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-7865000	usd
CY2023	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	18248000	usd
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	291000	usd
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2036000	usd
CY2023	caty	Write Off Of Debt Securities WriteOffOfDebtSecurities	-3000000	usd
CY2022	caty	Write Off Of Debt Securities WriteOffOfDebtSecurities	-0	usd
CY2021	caty	Write Off Of Debt Securities WriteOffOfDebtSecurities	-0	usd
CY2023	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	7836000	usd
CY2022	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	7832000	usd
CY2021	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	6810000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	54369000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	80411000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	34196000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-24429000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	107467000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2403000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	384742000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	467390000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	334317000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	618334000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	711707000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	560140000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	522815000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	213936000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	424386000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	21102000	usd
CY2023	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	usd
CY2022	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	553000	usd
CY2021	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	usd
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4013000	usd
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2752000	usd
CY2023	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	29381000	usd
CY2022	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	9776000	usd
CY2021	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	-0	usd
CY2023	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	28885000	usd
CY2022	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	9776000	usd
CY2021	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	usd
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1327048000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1272268000	usd
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	715862000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3401000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3390000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3728000	usd
CY2023	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	0	usd
CY2022	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	307000	usd
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	795000	usd
CY2023	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	50616000	usd
CY2022	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	6995000	usd
CY2021	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	29229000	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	73882000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1477080000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1849433000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-859924000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	820041000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-128803000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1949728000	usd
CY2023	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	14035000000	usd
CY2022	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	5480000000	usd
CY2021	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	50000000	usd
CY2023	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	13980000000	usd
CY2022	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	5015000000	usd
CY2021	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	180000000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	98638000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	100955000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	99322000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	16667000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	141316000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	167104000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3491000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3720000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3563000	usd
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4490000	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2905000	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2632000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	758737000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	94741000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1554233000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-333601000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1287302000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1028626000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1162402000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2449704000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1421078000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	828801000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1162402000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2449704000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	484861000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	105521000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	75486000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	70332000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	96881000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	92691000	usd
CY2023	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	18642000	usd
CY2022	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	-105043000	usd
CY2021	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	-11989000	usd
CY2023	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	-1763000	usd
CY2022	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	5813000	usd
CY2021	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	3614000	usd
CY2023	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	15374000	usd
CY2022	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	0	usd
CY2021	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	205000	usd
CY2023	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	usd
CY2022	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	32000	usd
CY2021	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	usd
CY2023Q4	caty	Number Of Limited Partnerships In Housing Investments NumberOfLimitedPartnershipsInHousingInvestments	11	pure
CY2023Q4	caty	Percentage Of Subsidiaries Common Securities Owned By Parent Company PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany	1	pure
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:18pt;"><i>Use of Estimates. </i>The preparation of the Consolidated Financial Statements in accordance with GAAP requires management of the Company to make several estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the period. Actual results could differ from those estimates. The significant estimates subject to change relate to the allowance for credit losses.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:18pt;"></p>
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:18pt;"><i>Concentrations. </i>The Bank was incorporated in California and started its business from California. Therefore, loans originated, and deposits solicited were mainly from California. As of <em style="font: inherit;"> December 31, 2023, </em>gross loans were primarily comprised of 49.8% of commercial real estate loans, 29.9% of residential mortgage loans, and 16.9% of commercial loans. As of <em style="font: inherit;"> December 31, 2023, </em>approximately 50.5% of the Bank’s residential mortgages were for properties located in California.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:18pt;"></p>
CY2023Q4	caty	Gross Loans Comprised Of Commercial Mortgage Loans Percentage GrossLoansComprisedOfCommercialMortgageLoansPercentage	0.498	pure
CY2023Q4	caty	Residential Mortgages Properties Percentage ResidentialMortgagesPropertiesPercentage	0.299	pure
CY2023Q4	caty	Gross Loans Comprised Of Commercial Loans Percentage GrossLoansComprisedOfCommercialLoansPercentage	0.169	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17700000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17300000	usd
CY2023Q4	caty	Federal Home Loan Bank Stock Shares FederalHomeLoanBankStockShares	177458
CY2023Q4	caty	Minimum Stock Requirement On Outstanding Federal Home Loan Bank Borrowings Shares MinimumStockRequirementOnOutstandingFederalHomeLoanBankBorrowingsShares	150000
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	caty	Average Excess Balances Maintained With Federal Reserve Bank AverageExcessBalancesMaintainedWithFederalReserveBank	1090000000.00	usd
CY2022	caty	Average Excess Balances Maintained With Federal Reserve Bank AverageExcessBalancesMaintainedWithFederalReserveBank	1240000000	usd
CY2023Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	53800000	usd
CY2022Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	88900000	usd
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	6400000	usd
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	25400000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1726080000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	515000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	122025000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1604570000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1622173000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	690000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	149515000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1473348000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	525406000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	524948000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	227132000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	215834000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	149042000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	141044000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	824500000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	722744000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1726080000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1604570000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	21100000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	853000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023	us-gaap	Debt Securities Held To Maturity Transfer To Available For Sale Allowance For Credit Loss Expense DebtSecuritiesHeldToMaturityTransferToAvailableForSaleAllowanceForCreditLossExpense	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	132580000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	680000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	964495000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	121345000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1097075000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	122025000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	769045000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	39023000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	562156000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	110492000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1331201000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	149515000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	192	pure
CY2023Q4	caty	Pledged Investment Securities PledgedInvestmentSecurities	134200000	usd
CY2022Q4	caty	Pledged Investment Securities PledgedInvestmentSecurities	145700000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	40400000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	22200000	usd
CY2023	caty	Equity Securities Net Realized Loss From Decrease In Fair Value EquitySecuritiesNetRealizedLossFromDecreaseInFairValue	18200000	usd
CY2022	caty	Equity Securities Net Realized Loss From Decrease In Fair Value EquitySecuritiesNetRealizedLossFromDecreaseInFairValue	291000	usd
CY2021	caty	Equity Securities Net Realized Loss From Decrease In Fair Value EquitySecuritiesNetRealizedLossFromDecreaseInFairValue	1400000	usd
CY2022	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	553000	usd
CY2022	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-101000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	19548140000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	18254024000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	154562000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	146485000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-10720000	usd
CY2022Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-6641000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	19382858000	usd
CY2022Q4	us-gaap	Notes Receivable Net NotesReceivableNet	18100898000	usd
CY2023Q4	us-gaap	Servicing Asset ServicingAsset	203000000	usd
CY2022Q4	us-gaap	Servicing Asset ServicingAsset	181400000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	33217000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	38532000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	20160000	usd
CY2022	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	25050000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	7670000	usd
CY2022	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	30365000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	45707000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	33217000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	66700000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	68900000	usd
CY2023	caty	Financing Receivable Nonaccrual Average Recorded Investment FinancingReceivableNonaccrualAverageRecordedInvestment	71800000	usd
CY2022	caty	Financing Receivable Nonaccrual Average Recorded Investment FinancingReceivableNonaccrualAverageRecordedInvestment	71400000	usd
CY2023	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	321000	usd
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	435000	usd
CY2021	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	1100000	usd
CY2023Q4	caty	Percentage Of Charge Off To Contractual Balances For Impaired Loans PercentageOfChargeOffToContractualBalancesForImpairedLoans	0.158	pure
CY2022Q4	caty	Percentage Of Charge Off To Contractual Balances For Impaired Loans PercentageOfChargeOffToContractualBalancesForImpairedLoans	0.141	pure
CY2023	caty	Financing Receivable Nonaccrual Average Recorded Investment FinancingReceivableNonaccrualAverageRecordedInvestment	71830000	usd
CY2023	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	321000	usd
CY2022	caty	Financing Receivable Nonaccrual Average Recorded Investment FinancingReceivableNonaccrualAverageRecordedInvestment	71371000	usd
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	435000	usd
CY2023Q4	caty	Financing Receivable Nonaccrual No Allowance Unpaid Principal Balance FinancingReceivableNonaccrualNoAllowanceUnpaidPrincipalBalance	88728000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	66681000	usd
CY2023Q4	caty	Financing Receivable Nonaccrual With Allowance Unpaid Principal Balance FinancingReceivableNonaccrualWithAllowanceUnpaidPrincipalBalance	0	usd
CY2023Q4	caty	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	0	usd
CY2023Q4	caty	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	0	usd
CY2023Q4	caty	Financing Receivable Nonaccrual Unpaid Principal Balance FinancingReceivableNonaccrualUnpaidPrincipalBalance	88728000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	66681000	usd
CY2023Q4	caty	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	0	usd
CY2022Q4	caty	Financing Receivable Nonaccrual No Allowance Unpaid Principal Balance FinancingReceivableNonaccrualNoAllowanceUnpaidPrincipalBalance	74673000	usd
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	54140000	usd
CY2022Q4	caty	Financing Receivable Nonaccrual With Allowance Unpaid Principal Balance FinancingReceivableNonaccrualWithAllowanceUnpaidPrincipalBalance	16539000	usd
CY2022Q4	caty	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	14714000	usd
CY2022Q4	caty	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	3941000	usd
CY2022Q4	caty	Financing Receivable Nonaccrual Unpaid Principal Balance FinancingReceivableNonaccrualUnpaidPrincipalBalance	91212000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	68854000	usd
CY2022Q4	caty	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	3941000	usd
CY2023	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	66681000	usd
CY2022	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	68854000	usd
CY2021	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	65846000	usd
CY2023	caty	Financing Receivable Nonaccrual Contractual Interest Due FinancingReceivableNonaccrualContractualInterestDue	6270000	usd
CY2022	caty	Financing Receivable Nonaccrual Contractual Interest Due FinancingReceivableNonaccrualContractualInterestDue	4620000	usd
CY2021	caty	Financing Receivable Nonaccrual Contractual Interest Due FinancingReceivableNonaccrualContractualInterestDue	4032000	usd
CY2023	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	321000	usd
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	435000	usd
CY2021	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	1074000	usd
CY2023	caty	Financing Receivable Nonaccrual Interest Lost FinancingReceivableNonaccrualInterestLost	5949000	usd
CY2022	caty	Financing Receivable Nonaccrual Interest Lost FinancingReceivableNonaccrualInterestLost	4185000	usd
CY2021	caty	Financing Receivable Nonaccrual Interest Lost FinancingReceivableNonaccrualInterestLost	2958000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	19548140000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	18254024000	usd
CY2022	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	usd
CY2022	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	15	pure
CY2022	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	11980000	usd
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	11946000	usd
CY2022	caty	Financing Receivables Impaired Troubled Debt Restructuring Specific Reserve FinancingReceivablesImpairedTroubledDebtRestructuringSpecificReserve	427000	usd
CY2022	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	usd
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5	pure
CY2021	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2153000	usd
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2153000	usd
CY2021	caty	Financing Receivables Impaired Troubled Debt Restructuring Specific Reserve FinancingReceivablesImpairedTroubledDebtRestructuringSpecificReserve	0	usd
CY2021	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2872000	usd
CY2023	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	usd
CY2023	us-gaap	Financing Receivable Troubled Debt Restructuring Increase Decrease From Modification FinancingReceivableTroubledDebtRestructuringIncreaseDecreaseFromModification	2872000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	3724618000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	3581730000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	3052314000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1588314000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1686965000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3571544000	usd
CY2023Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	2306710000	usd
CY2023Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	25225000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	19537420000	usd
CY2023	us-gaap	Financing Receivable Year One Originated Current Fiscal Year Writeoff FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff	0	usd
CY2023	us-gaap	Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	992000	usd
CY2023	us-gaap	Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	1520000	usd
CY2023	us-gaap	Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	384000	usd
CY2023	us-gaap	Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	4641000	usd
CY2023	us-gaap	Financing Receivable Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	14429000	usd
CY2023	us-gaap	Financing Receivable Revolving Writeoff FinancingReceivableRevolvingWriteoff	1520000	usd
CY2023	us-gaap	Financing Receivable Revolving Converted To Term Loan Writeoff FinancingReceivableRevolvingConvertedToTermLoanWriteoff	0	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23486000	usd
CY2022Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	3943040000	usd
CY2022Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	3489846000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	1905136000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1908992000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1530238000	usd
CY2022Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3138606000	usd
CY2022Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	2303152000	usd
CY2022Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	28373000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	18247383000	usd
CY2022	us-gaap	Financing Receivable Year One Originated Current Fiscal Year Writeoff FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff	212000	usd
CY2022	us-gaap	Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	587000	usd
CY2022	us-gaap	Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	120000	usd
CY2022	us-gaap	Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	71000	usd
CY2022	us-gaap	Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	3938000	usd
CY2022	us-gaap	Financing Receivable Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	360000	usd
CY2022	us-gaap	Financing Receivable Revolving Writeoff FinancingReceivableRevolvingWriteoff	202000	usd
CY2022	us-gaap	Financing Receivable Revolving Converted To Term Loan Writeoff FinancingReceivableRevolvingConvertedToTermLoanWriteoff	0	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5490000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	136157000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	12913000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5490000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2905000	usd
CY2022	caty	Financing Receivable Allowance For Credit Losses Net Charge Offs FinancingReceivableAllowanceForCreditLossesNetChargeOffs	-2585000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	146485000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	25655000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23486000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	5908000	usd
CY2023	caty	Financing Receivable Allowance For Credit Losses Net Charge Offs FinancingReceivableAllowanceForCreditLossesNetChargeOffs	-17578000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	154562000	usd
CY2023Q4	caty	Investments In Affordable Housing And Alternative Energy Partnerships InvestmentsInAffordableHousingAndAlternativeEnergyPartnerships	315700000	usd
CY2022Q4	caty	Investments In Affordable Housing And Alternative Energy Partnerships InvestmentsInAffordableHousingAndAlternativeEnergyPartnerships	327100000	usd
CY2023Q4	caty	Affordable Housing Investments AffordableHousingInvestments	295740000	usd
CY2022Q4	caty	Affordable Housing Investments AffordableHousingInvestments	289920000	usd
CY2023Q4	caty	Other Borrowings From Consolidating Affordable Housing Equity Interest OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest	15787000	usd
CY2022Q4	caty	Other Borrowings From Consolidating Affordable Housing Equity Interest OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest	22600000	usd
CY2023Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	106452000	usd
CY2022Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	133491000	usd
CY2023Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	19943000	usd
CY2022Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	37208000	usd
CY2023	caty	Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest	25300000	usd
CY2022	caty	Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest	31300000	usd
CY2023Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	19900000	usd
CY2022Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	37200000	usd
CY2023Q4	caty	Alternative Energy Tax Credit Partnership Investments Held In Escrow AlternativeEnergyTaxCreditPartnershipInvestmentsHeldInEscrow	6400000	usd
CY2022Q4	caty	Alternative Energy Tax Credit Partnership Investments Held In Escrow AlternativeEnergyTaxCreditPartnershipInvestmentsHeldInEscrow	25400000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Next12 Months AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInNext12Months	49810000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Two AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearTwo	34871000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Three AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearThree	15194000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Four AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFour	1400000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Five AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFive	1019000	usd
CY2023Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments Thereafter AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsThereafter	4158000	usd
CY2023Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	106452000	usd
CY2023	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	32395000	usd
CY2022	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	29524000	usd
CY2021	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	26459000	usd
CY2023	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	41320000	usd
CY2022	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	4707000	usd
CY2021	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	6337000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	211730000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	208435000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	120633000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	113659000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	91097000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	94776000	usd
CY2023	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7100000	usd
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	8000000	usd
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7700000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	375700000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1001000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	947000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	870000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	870000	usd
CY2023Q4	caty	Finitelived Intangible Asset Expected Amortization After Year Four FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour	356000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4044000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	3529018000	usd
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4168989000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	2370685000	usd
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	2509736000	usd
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	3049754000	usd
CY2022Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	3812724000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1039203000	usd
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1000460000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	9336787000	usd
CY2022Q4	us-gaap	Time Deposits TimeDeposits	7013370000	usd
CY2023Q4	us-gaap	Deposits Deposits	19325447000	usd
CY2022Q4	us-gaap	Deposits Deposits	18505279000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	9312877000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	18429000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	3203000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	2230000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	23000	usd
CY2023Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	25000	usd
CY2023Q4	us-gaap	Time Deposits At Carrying Value TimeDepositsAtCarryingValue	9336787000	usd
CY2023Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	28600000	usd
CY2022Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	13200000	usd
CY2021Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	1700000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	40952000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	8176000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	2249000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	86097000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	39913000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	18241000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	8916000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	853000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	769000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	331997000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	56354000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	40542000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	467962000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	105296000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	61801000	usd
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	6600000000	usd
CY2004Q4	caty	Threshold For Deferred Bonus ThresholdForDeferredBonus	225000	usd
CY2004Q4	caty	Amount Of Deferred Bonus Accrued In Other Liabilities AmountOfDeferredBonusAccruedInOtherLiabilities	610000	usd
CY2004Q4	caty	Accrued Interest On Deferred Bonus AccruedInterestOnDeferredBonus	0.07	pure
CY2014Q4	caty	Accrued Interest On Deferred Bonus AccruedInterestOnDeferredBonus	0.0506	pure
CY2014Q1	caty	Amount Of Deferred Bonus Accrued In Other Liabilities AmountOfDeferredBonusAccruedInOtherLiabilities	300000	usd
CY2014Q1	caty	Accrued Interest On Deferred Bonus AccruedInterestOnDeferredBonus	0.0502	pure
CY2019Q1	caty	Accrued Interest On Deferred Bonus AccruedInterestOnDeferredBonus	0.0572	pure
CY2023Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	2400000	usd
CY2022Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	2300000	usd
CY2023	us-gaap	Interest Expense Other InterestExpenseOther	122000	usd
CY2022	us-gaap	Interest Expense Other InterestExpenseOther	116000	usd
CY2021	us-gaap	Interest Expense Other InterestExpenseOther	110000	usd
CY2023Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	119100000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2740000000	usd
CY2023	us-gaap	Stockholders Equity Period Increase Decrease StockholdersEquityPeriodIncreaseDecrease	262500000	usd
CY2023	caty	Stockholders Equity Period Increase Decrease Percentage StockholdersEquityPeriodIncreaseDecreasePercentage	0.106	pure
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2470000000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	354100000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16900000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7000000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3500000	usd
CY2023	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	900000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	98600000	usd
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	16700000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.36
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.36
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.27
CY2022Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	125000000	usd
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	2522538
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	108400000	usd
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	42.98
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	3227465
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	141300000	usd
CY2022	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	43.79
CY2023Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	375090
CY2023Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	44.2
CY2023Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	16600000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5428000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	57029000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	29955000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	48812000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	56953000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	44416000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	54240000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	113982000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	74371000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1676000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1776000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	5986000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3106000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-312000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3182000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4782000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2088000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9168000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49458000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111894000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83539000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	50126000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	47673000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	4636000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	2591000	usd
CY2023Q4	caty	Deferred Tax Assets Nonaccrual Interest DeferredTaxAssetsNonaccrualInterest	2164000	usd
CY2022Q4	caty	Deferred Tax Assets Nonaccrual Interest DeferredTaxAssetsNonaccrualInterest	1572000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	2018000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	1975000	usd
CY2023Q4	caty	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	765000	usd
CY2022Q4	caty	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	0	usd
CY2023Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	5693000	usd
CY2022Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	6251000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	31728000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	40400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9136000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9136000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3787000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5916000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7632000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4711000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	117685000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	120225000	usd
CY2023Q4	caty	Deferred Tax Liabilities Deferred Expense Loan Costs DeferredTaxLiabilitiesDeferredExpenseLoanCosts	9687000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.072	pure
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	32795000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.086	pure
CY2023	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2900000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007	pure
CY2022	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2195000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.004	pure
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1435000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003	pure
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49458000	usd
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.123	pure
CY2022Q4	caty	Deferred Tax Liabilities Deferred Expense Loan Costs DeferredTaxLiabilitiesDeferredExpenseLoanCosts	10025000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-0	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2856000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	838000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	1364000	usd
CY2023Q4	caty	Deferred Tax Liabilities Unrealized Gains On Equity Securities DeferredTaxLiabilitiesUnrealizedGainsOnEquitySecurities	4863000	usd
CY2022Q4	caty	Deferred Tax Liabilities Unrealized Gains On Equity Securities DeferredTaxLiabilitiesUnrealizedGainsOnEquitySecurities	-0	usd
CY2023Q4	caty	Deferred Tax Liabilities Dividends On Federal Home Loan Bank Common Stock DeferredTaxLiabilitiesDividendsOnFederalHomeLoanBankCommonStock	977000	usd
CY2022Q4	caty	Deferred Tax Liabilities Dividends On Federal Home Loan Bank Common Stock DeferredTaxLiabilitiesDividendsOnFederalHomeLoanBankCommonStock	981000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3916000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3506000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	20281000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	18732000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	97404000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	101493000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	7500000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	1000000	usd
CY2023Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	33700000	usd
CY2022Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	16700000	usd
CY2023Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	15900000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	84752000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	99233000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	80187000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	36107000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.09	pure
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	44837000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.095	pure
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	37602000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.098	pure
CY2023	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount	-586000	usd
CY2023	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Percentage EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitPercentage	-0.001	pure
CY2022	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount	-140000	usd
CY2022	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Percentage EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitPercentage	0	pure
CY2021	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount	-20000	usd
CY2021	caty	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Percentage EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitPercentage	0	pure
CY2023	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	73715000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.183	pure
CY2022	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	34231000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111894000	usd
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.237	pure
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83539000	usd
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.219	pure
CY2023Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments With Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval	420400000	usd
CY2022Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments With Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval	296200000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	354124000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	360642000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	298304000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	354124000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72573025
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.88
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	360642000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74337265
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.85
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	298304000	usd
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	78268369
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	289603
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	327470
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	302269
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	354124000	usd
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	72862628
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.86
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	360642000	usd
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	74664735
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.83
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	298304000	usd
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	78570638
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.8
CY2023Q4	us-gaap	Other Commitment OtherCommitment	4188545000	usd
CY2022Q4	us-gaap	Other Commitment OtherCommitment	3975541000	usd
CY2023Q4	caty	Commitments To Extend Notional Amount CommitmentsToExtendNotionalAmount	3810000000	usd
CY2023Q4	caty	Commitments To Fund Fixed Rate Loans CommitmentsToFundFixedRateLoans	130300000	usd
CY2023Q4	caty	Commitments To Fund Adjustable Rate Loans CommitmentsToFundAdjustableRateLoans	3690000000	usd
CY2022Q4	caty	Commitments To Extend Notional Amount CommitmentsToExtendNotionalAmount	3630000000	usd
CY2022Q4	caty	Commitments To Fund Fixed Rate Loans CommitmentsToFundFixedRateLoans	93100000	usd
CY2022Q4	caty	Commitments To Fund Adjustable Rate Loans CommitmentsToFundAdjustableRateLoans	3540000000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	32100000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29600000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34800000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	32500000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y1M6D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038	pure
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.029	pure
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	11400000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	11400000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	12600000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5900000	usd
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	12800000	usd
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	13100000	usd
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	11600000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	10800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	8960000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7297000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	5238000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3916000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1403000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	37614000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2817000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	34797000	usd
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CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	22158000	usd
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CY2023Q4	caty	Foreign Exchange Contract Asset Fair Value Gain Disclosure ForeignExchangeContractAssetFairValueGainDisclosure	379000	usd
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CY2022Q4	caty	Foreign Exchange Contract Asset Fair Value Gain Disclosure ForeignExchangeContractAssetFairValueGainDisclosure	448000	usd
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CY2022Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	44443000	usd
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CY2023Q4	caty	Foreign Currency Contract Asset Fair Value Loss Disclosure ForeignCurrencyContractAssetFairValueLossDisclosure	175000	usd
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CY2022Q4	caty	Foreign Currency Contract Asset Fair Value Loss Disclosure ForeignCurrencyContractAssetFairValueLossDisclosure	942000	usd
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CY2022Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	51864000	usd
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CY2022Q4	caty	Other Letters Of Credit Notional Amount OtherLettersOfCreditNotionalAmount	29416000	usd
CY2022Q4	caty	Other Letters Of Credit Fair Value OtherLettersOfCreditFairValue	-33000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	43912000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	42179000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	39074000	usd
CY2023	caty	Noninteres Income Not Inscope NoninteresIncomeNotInscope	24380000	usd
CY2022	caty	Noninteres Income Not Inscope NoninteresIncomeNotInscope	14635000	usd
CY2021	caty	Noninteres Income Not Inscope NoninteresIncomeNotInscope	15529000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	68292000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	56814000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	54603000	usd
CY2023	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	16555
CY2022	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	18808
CY2021	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	18338
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	613000	usd
CY2022	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	814000	usd
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	781000	usd
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	33554
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	29363
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	47617
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	676594
CY2023Q4	caty	Percentage Of Outstanding Common Stock Under Employee Stock Ownership Plan PercentageOfOutstandingCommonStockUnderEmployeeStockOwnershipPlan	0.0093	pure
	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.75	pure
	caty	Defined Contribution Plan Employers Matching Contribution Vesting Percentage Less Than Two Years Of Service DefinedContributionPlanEmployersMatchingContributionVestingPercentageLessThanTwoYearsOfService	0	pure
	caty	Defined Contribution Plan Employers Matching Contribution Vesting Percentage After Five Years Of Service DefinedContributionPlanEmployersMatchingContributionVestingPercentageAfterFiveYearsOfService	1	pure
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1	pure
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.05	pure
CY2023	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	4500000	usd
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3900000	usd
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3600000	usd
CY2023	caty	Percentage Of Participant Borrowing Capacity Of Vested Amount PercentageOfParticipantBorrowingCapacityOfVestedAmount	0.50	pure
CY2023Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	50900000	usd
CY2022Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	49900000	usd
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9900000	usd
CY2022Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9000000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	1150838000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2022Q4	caty	Common Equtiy Tier1 Capital CommonEqutiyTier1Capital	2276830000	usd
CY2023	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	93182
CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3500000	usd
CY2022	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	86501
CY2022	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3700000	usd
CY2021	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	84011
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3600000	usd
CY2023Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.065	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2023Q4	caty	Common Equtiy Tier1 Capital CommonEqutiyTier1Capital	2501439000	usd
CY2023Q4	caty	Common Tier One Risk Based Capital To Risk Weighted Assets CommonTierOneRiskBasedCapitalToRiskWeightedAssets	0.1323	pure
CY2023Q4	caty	Banking Regulation Common Equity Tier One Riskbased Capital Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationCommonEquityTierOneRiskbasedCapitalCapitalAdequacyMinimumIncludingCapitalConservationBuffer	1323846000	usd
CY2023Q4	caty	Banking Regulation Common Equity Tier One Riskbased Capital Ratio Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationCommonEquityTierOneRiskbasedCapitalRatioCapitalAdequacyMinimumIncludingCapitalConservationBuffer	0.07	pure
CY2023Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized	1229286000	usd
CY2023Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.065	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	2501439000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1323	pure
CY2023Q4	caty	Banking Regulation Tier One Riskbased Capital Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationTierOneRiskbasedCapitalCapitalAdequacyMinimumIncludingCapitalConservationBuffer	1607527000	usd
CY2023Q4	caty	Banking Regulation Tier One Riskbased Capital Ratio Capital Adequacy Minimum Including Capital Conservation Buffe BankingRegulationTierOneRiskbasedCapitalRatioCapitalAdequacyMinimumIncludingCapitalConservationBuffe	0.085	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	1512967000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Capital Capital	2665054000	usd
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1409	pure
CY2023Q4	caty	Banking Regulation Total Riskbased Capital Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationTotalRiskbasedCapitalCapitalAdequacyMinimumIncludingCapitalConservationBuffer	1985769000	usd
CY2023Q4	caty	Banking Regulation Total Riskbased Capital Ratio Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationTotalRiskbasedCapitalRatioCapitalAdequacyMinimumIncludingCapitalConservationBuffer	0.105	pure
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	1891209000	usd
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	2501439000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1087	pure
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	920670000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04	pure
CY2022Q4	caty	Common Tier One Risk Based Capital To Risk Weighted Assets CommonTierOneRiskBasedCapitalToRiskWeightedAssets	0.1275	pure
CY2022Q4	caty	Banking Regulation Common Equity Tier One Riskbased Capital Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationCommonEquityTierOneRiskbasedCapitalCapitalAdequacyMinimumIncludingCapitalConservationBuffer	1250461000	usd
CY2022Q4	caty	Banking Regulation Common Equity Tier One Riskbased Capital Ratio Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationCommonEquityTierOneRiskbasedCapitalRatioCapitalAdequacyMinimumIncludingCapitalConservationBuffer	0.07	pure
CY2022Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized	1161142000	usd
CY2022Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.065	pure
CY2022Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	2276830000	usd
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	1429098000	usd
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2022Q4	us-gaap	Capital Capital	2432045000	usd
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1361	pure
CY2022Q4	caty	Banking Regulation Total Riskbased Capital Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationTotalRiskbasedCapitalCapitalAdequacyMinimumIncludingCapitalConservationBuffer	1875691000	usd
CY2022Q4	caty	Banking Regulation Total Riskbased Capital Ratio Capital Adequacy Minimum Including Capital Conservation Buffer BankingRegulationTotalRiskbasedCapitalRatioCapitalAdequacyMinimumIncludingCapitalConservationBuffer	0.105	pure
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	1786373000	usd
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2022Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	2276830000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1053	pure
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	864918000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04	pure
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	1081148000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	54268000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	335000	usd
CY2023Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet NetAmountOfDerivativeAssetsPresentedInTheBalanceSheet	53933000	usd
CY2023Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	44860000	usd
CY2023Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet Not Offset NetAmountOfDerivativeAssetsPresentedInTheBalanceSheetNotOffset	9073000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	45762000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	-0	usd
CY2023Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheet	45762000	usd
CY2023Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	-0	usd
CY2023Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet Not Offset NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheetNotOffset	45762000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	90451000	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	46008000	usd
CY2022Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet NetAmountOfDerivativeAssetsPresentedInTheBalanceSheet	44443000	usd
CY2022Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	42930000	usd
CY2022Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet Not Offset NetAmountOfDerivativeAssetsPresentedInTheBalanceSheetNotOffset	1513000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	51864000	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	-0	usd
CY2022Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheet	51864000	usd
CY2022Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	-0	usd
CY2022Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet Not Offset NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheetNotOffset	51864000	usd

Files In Submission

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$CATY
CATHAY GENERAL BANCORP Stock $caty

2024 Q1 Form 10-K Financial Statement

#000143774924005948 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CATY CATHAY GENERAL BANCORP Stock $caty

2024 Q1 Form 10-K Financial Statement

#000143774924005948 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CATY
CATHAY GENERAL BANCORP Stock $caty