$CATY
CATHAY GENERAL BANCORP Stock $caty

$caty Overview Financials Valuation SEC Filings Company Website

2019 Form 10-K Financial Statement

#000143774920003977 Filed on March 02, 2020

Income Statement

Concept	2019	2018 Q4	2018 Q3
Revenue	$769.3M		$176.9M
YoY Change	11.82%		14.79%
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	$6.756M	$1.700M	$1.700M
YoY Change	-7.63%	-10.53%	-10.53%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$194.4M	$38.43M	$31.78M
YoY Change	59.24%	70.09%	52.2%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$349.4M	$81.84M	$88.46M
YoY Change	3.46%	6.14%	4.18%
Income Tax	$70.23M	$17.19M	$18.70M
% Of Pretax Income	20.1%	21.01%	21.14%
Net Earnings	$279.1M	$64.65M	$69.76M
YoY Change	2.67%	149.22%	40.23%
Net Earnings / Revenue	36.29%		39.44%
Basic Earnings Per Share	$3.49	$0.80	$0.86
Diluted Earnings Per Share	$3.48	$0.80	$0.85
COMMON SHARES
Basic Shares Outstanding	80.00M		81.31M
Diluted Shares Outstanding	80.25M		81.86M

Balance Sheet

Concept	2019	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$600.3M	$582.0M
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	$138.0M	$103.2M	$102.6M
YoY Change	33.98%	0.12%	-4.99%
Goodwill		$372.2M	$372.2M
YoY Change		0.0%	0.0%
Intangibles		$7.194M	$7.391M
YoY Change		-10.77%	-21.44%
Long-Term Investments
YoY Change
Other Assets	$57.00M
YoY Change	-25.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$18.09B	$16.78B	$16.46B
YoY Change	7.8%	7.32%	4.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$36.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$26.00M	$0.00	$0.00
YoY Change		-100.0%	-100.0%
Long-Term Debt Due	$0.00	$19.00M	$19.00M
YoY Change	-100.0%
Total Short-Term Liabilities	$36.00M	$19.00M	$19.00M
YoY Change	89.47%	-81.0%	-81.0%
LONG-TERM LIABILITIES
Long-Term Debt	$148.0M	$188.0M	$193.0M
YoY Change	-21.28%	-11.32%	40.88%
Other Long-Term Liabilities	$217.0M	$201.0M	$227.0M
YoY Change	7.96%	-9.46%	-35.88%
Total Long-Term Liabilities	$365.0M	$389.0M	$420.0M
YoY Change	-6.17%	-10.37%	-14.46%
TOTAL LIABILITIES
Total Short-Term Liabilities	$36.00M	$19.00M	$19.00M
Total Long-Term Liabilities	$365.0M	$389.0M	$420.0M
Total Liabilities	$15.80B	$14.66B	$14.34B
YoY Change	7.75%	7.29%	4.25%
SHAREHOLDERS EQUITY
Retained Earnings		$1.479B	$1.439B
YoY Change		15.41%	12.89%
Common Stock		$898.0K	$896.0K
YoY Change		0.79%	0.67%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$282.2M	$239.6M
YoY Change		17.8%	0.0%
Treasury Stock Shares		$9.324M	$8.211M
Shareholders Equity	$2.294B	$2.122B	$2.117B
YoY Change
Total Liabilities & Shareholders Equity	$18.09B	$16.78B	$16.46B
YoY Change	7.8%	7.32%	4.66%

Cashflow Statement

Concept	2019	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$279.1M	$64.65M	$69.76M
YoY Change	2.67%	149.22%	40.23%
Depreciation, Depletion And Amortization	$6.756M	$1.700M	$1.700M
YoY Change	-7.63%	-10.53%	-10.53%
Cash From Operating Activities	$435.0M	$97.20M	$89.20M
YoY Change	29.25%	-22.43%	-1451.52%
INVESTING ACTIVITIES
Capital Expenditures	$7.133M	-$2.200M	-$1.800M
YoY Change	6.94%	0.0%	-357.14%
Acquisitions	$0.00
YoY Change
Other Investing Activities	-$1.375B	-$326.0M	-$124.8M
YoY Change	21.89%	43.8%	-47.5%
Cash From Investing Activities	-$1.382B	-$328.2M	-$126.4M
YoY Change	21.81%	43.38%	-46.67%
FINANCING ACTIVITIES
Cash Dividend Paid	$99.13M
YoY Change	18.82%
Common Stock Issuance & Retirement, Net	$36.30M
YoY Change	-14.88%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$940.2M	254.3M	215.2M
YoY Change	8.91%	1210.82%	-30.18%
NET CHANGE
Cash From Operating Activities	$435.0M	97.20M	89.20M
Cash From Investing Activities	-$1.382B	-328.2M	-126.4M
Cash From Financing Activities	$940.2M	254.3M	215.2M
Net Change In Cash	-$6.512M	23.30M	178.0M
YoY Change	-109.94%	-127.67%	175.54%
FREE CASH FLOW
Cash From Operating Activities	$435.0M	$97.20M	$89.20M
Capital Expenditures	$7.133M	-$2.200M	-$1.800M
Free Cash Flow	$427.8M	$99.40M	$91.00M
YoY Change	29.7%	-22.04%	-1346.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
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CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	177240000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	225333000	USD
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CY2017	us-gaap	Salaries Wages And Officers Compensation SalariesWagesAndOfficersCompensation	109458000	USD
CY2019	us-gaap	Occupancy Net OccupancyNet	22004000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	20690000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	20429000	USD
CY2019	us-gaap	Equipment Expense EquipmentExpense	11113000	USD
CY2018	us-gaap	Equipment Expense EquipmentExpense	11402000	USD
CY2017	us-gaap	Equipment Expense EquipmentExpense	10846000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	23107000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	22810000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	20439000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	13210000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	12438000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11190000	USD
CY2019	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9617000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	8000000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	10633000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	7585000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70234000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	65802000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	122265000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	7837000	USD
CY2017	us-gaap	Marketing Expense MarketingExpense	6200000	USD
CY2019	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	1115000	USD
CY2018	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	-719000	USD
CY2017	caty	Foreclosed Real Estate Expense Income ForeclosedRealEstateExpenseIncome	-1649000	USD
CY2019	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	39731000	USD
CY2018	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	40515000	USD
CY2017	caty	Operations Of Affordable Housing Investments Net And Alternative Energy Partnerships Net OperationsOfAffordableHousingInvestmentsNetAndAlternativeEnergyPartnershipsNet	27212000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	687000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	876000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	930000	USD
CY2019	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	0	USD
CY2018	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	2105000	USD
CY2017	caty	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	4121000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19819000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13988000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16390000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	277288000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	264419000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	236199000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	349369000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	337687000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	298307000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	279135000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	271885000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	176042000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	23628000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7934000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1068000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3171000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1525000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	719000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	149000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	15000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	583000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20308000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6424000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1204000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	299443000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	265461000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	177246000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.49
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.35
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.48
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.17
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	79999703
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	81131269
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80262782
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80247893
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	81607346
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	81004550
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1828539000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2528000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2000	USD
CY2017	caty	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	6813000	USD
CY2017	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	550000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1094000	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	34862000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5184000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	69888000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1204000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	176042000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1973304000	USD
CY2018	caty	Cumulative Effect Of Changes In Accounting Principlesequity Securities CumulativeEffectOfChangesInAccountingPrinciplesequitySecurities	0	USD
CY2018	caty	Reclassification Of Tax Effects In Accumulated Other Comprehensive Income Resulting From The New Corporate Income Tax Rate ReclassificationOfTaxEffectsInAccumulatedOtherComprehensiveIncomeResultingFromTheNewCorporateIncomeTaxRate	0	USD
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2822000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1000	USD
CY2018	caty	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	0	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2440000	USD
CY2018	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	649000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	838000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	42648000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7325000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	83446000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6424000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	271885000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2121866000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3366000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2311000	USD
CY2019	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	749000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	36301000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6601000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	99131000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	20308000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	279135000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2294283000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	279135000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	271885000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	176042000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-7000000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-4500000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-2500000	USD
CY2019	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	681000	USD
CY2018	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	0	USD
CY2017	caty	Provision Reversal For Losses On Other Real Estate Owned ProvisionReversalForLossesOnOtherRealEstateOwned	691000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-9825000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-2343000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-34554000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	6756000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7314000	USD
CY2017	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	4572000	USD
CY2019	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	211000	USD
CY2018	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	22000	USD
CY2017	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	1006000	USD
CY2019	caty	Other Noncash Interest OtherNoncashInterest	0	USD
CY2018	caty	Other Noncash Interest OtherNoncashInterest	-1576000	USD
CY2017	caty	Other Noncash Interest OtherNoncashInterest	-1740000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3834000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7265000	USD
CY2019	caty	Amortization Of Right Of Use Asset Operating Lease AmortizationOfRightOfUseAssetOperatingLease	8366000	USD
CY2018	caty	Amortization Of Right Of Use Asset Operating Lease AmortizationOfRightOfUseAssetOperatingLease	0	USD
CY2017	caty	Amortization Of Right Of Use Asset Operating Lease AmortizationOfRightOfUseAssetOperatingLease	0	USD
CY2019	caty	Change In Operating Lease Liabilities ChangeInOperatingLeaseLiabilities	-7157000	USD
CY2018	caty	Change In Operating Lease Liabilities ChangeInOperatingLeaseLiabilities	0	USD
CY2017	caty	Change In Operating Lease Liabilities ChangeInOperatingLeaseLiabilities	0	USD
CY2019	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	212000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	1187000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2661000	USD
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	804000	USD
CY2018	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	-0	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	-0	USD
CY2019	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	75257000	USD
CY2018	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	8000000	USD
CY2017	caty	Proceeds From Sale Of Loans Operating Activities ProceedsFromSaleOfLoansOperatingActivities	7500000	USD
CY2019	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	2241000	USD
CY2018	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	-0	USD
CY2017	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	-0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-14000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-107000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-0	USD
CY2019	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	39898000	USD
CY2018	caty	Accretion Amortization Of Investments AccretionAmortizationOfInvestments	40871000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3018000	USD
CY2017	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2945000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	5736000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2787000	USD
CY2017	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-0	USD
CY2019	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	7350000	USD
CY2018	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	7974000	USD
CY2017	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	5734000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-6163000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	13984000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-25747000	USD
CY2019	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	-0	USD
CY2018	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	340000	USD
CY2017	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	5628000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	21061000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	13848000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2641000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	434979000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	336538000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	248874000	USD
CY2019	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-0	USD
CY2018	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-5000000	USD
CY2017	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-0	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	770206000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	497787000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	607574000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	296721000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	447773000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	562595000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	293849000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	99899000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	111704000	USD
CY2019	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	2829000	USD
CY2018	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	USD
CY2017	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	USD
CY2019	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	1815000	USD
CY2018	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	5430000	USD
CY2017	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	8160000	USD
CY2019	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	975000	USD
CY2018	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	11265000	USD
CY2017	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	13482000	USD
CY2019	us-gaap	Payments For Proceeds From Federal Reserve Bank Stock PaymentsForProceedsFromFederalReserveBankStock	-0	USD
CY2018	us-gaap	Payments For Proceeds From Federal Reserve Bank Stock PaymentsForProceedsFromFederalReserveBankStock	-0	USD
CY2017	us-gaap	Payments For Proceeds From Federal Reserve Bank Stock PaymentsForProceedsFromFederalReserveBankStock	-8733000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1147019000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1125623000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	963858000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7133000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6670000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3188000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5598000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2822000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	3820000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	18357000	USD
CY2019	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	52697000	USD
CY2018	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	66574000	USD
CY2017	caty	Net Increase In Investment In Affordable Housing Investing And Alternative Energy Partnerships NetIncreaseInInvestmentInAffordableHousingInvestingAndAlternativeEnergyPartnerships	40284000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1392000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1381674000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1134327000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-903987000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	989942000	USD
CY2018	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1012284000	USD
CY2017	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	201224000	USD
CY2019	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	0	USD
CY2018	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-100000000	USD
CY2017	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-250000000	USD
CY2019	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	4355000000	USD
CY2018	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	5130000000	USD
CY2017	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	4823000000	USD
CY2019	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	4215000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	600290000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	534801000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1185084000	USD
CY2018	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	5030000000	USD
CY2017	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	4773000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	99131000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	83428000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	69888000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	36301000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	42648000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	25683000	USD
CY2018	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2017	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2019	caty	Proceeds From Issuance Of Longterm Debt And Other Longterm Debt ProceedsFromIssuanceOfLongtermDebtAndOtherLongtermDebt	0	USD
CY2018	caty	Proceeds From Issuance Of Longterm Debt And Other Longterm Debt ProceedsFromIssuanceOfLongtermDebtAndOtherLongtermDebt	0	USD
CY2017	caty	Proceeds From Issuance Of Longterm Debt And Other Longterm Debt ProceedsFromIssuanceOfLongtermDebtAndOtherLongtermDebt	75000000	USD
CY2019	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	81065000	USD
CY2018	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	23040000	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	-0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3366000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	2822000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	2528000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	838000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1094000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2311000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3550000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5128000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	940183000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	863278000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	4830000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-6512000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	65489000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-650283000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	593778000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	600290000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	534801000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	182527000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	116524000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	81069000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	61548000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	65866000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	76709000	USD
CY2019	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	23479000	USD
CY2018	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	-7949000	USD
CY2017	caty	Net Change In Unrealized Holding Loss Gain On Securities Available For Sale Net Of Tax NetChangeInUnrealizedHoldingLossGainOnSecuritiesAvailableForSaleNetOfTax	485000	USD
CY2019	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	-3171000	USD
CY2018	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	1525000	USD
CY2017	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	719000	USD
CY2019	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	860000	USD
CY2018	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	5476000	USD
CY2017	caty	Transfers To Other Real Estate Owned From Loans Held For Investment TransfersToOtherRealEstateOwnedFromLoansHeldForInvestment	1243000	USD
CY2019	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	75285000	USD
CY2018	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
CY2017	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	8000000	USD
CY2019	caty	Loans To Facilitate Sale Of Other Real Estate Owned LoansToFacilitateSaleOfOtherRealEstateOwned	0	USD
CY2018	caty	Loans To Facilitate Sale Of Other Real Estate Owned LoansToFacilitateSaleOfOtherRealEstateOwned	0	USD
CY2017	caty	Loans To Facilitate Sale Of Other Real Estate Owned LoansToFacilitateSaleOfOtherRealEstateOwned	10500000	USD
CY2019	caty	Business Combination Stock Issued Value BusinessCombinationStockIssuedValue	0	USD
CY2018	caty	Business Combination Stock Issued Value BusinessCombinationStockIssuedValue	0	USD
CY2017	caty	Business Combination Stock Issued Value BusinessCombinationStockIssuedValue	34862000	USD
CY2019Q4	caty	Number Of Limited Partnerships In Housing Investments NumberOfLimitedPartnershipsInHousingInvestments	10	pure
CY2019Q4	caty	Percentage Of Subsidiaries Common Securities Owned By Parent Company PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany	1	pure
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify; 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 loan losses.</p> <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"> </p>
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify; 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-weight: inherit; font-style: normal;"> December 31, 2019, </em>gross loans were primarily comprised of 48.3% of commercial mortgage loans, 27.1% of residential mortgage loans, and 18.4% of commercial loans. As of <em style="font-weight: inherit; font-style: normal;"> December 31, 2019, </em>approximately 54% of the Bank’s residential mortgages were for properties located in California.</p> <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"> </p>
CY2019Q4	caty	Gross Loans Comprised Of Commercial Mortgage Loans Percentage GrossLoansComprisedOfCommercialMortgageLoansPercentage	0.483	pure
CY2019Q4	caty	Residential Mortgages Properties Percentage ResidentialMortgagesPropertiesPercentage	0.271	pure
CY2019Q4	caty	Gross Loans Comprised Of Commercial Loans Percentage GrossLoansComprisedOfCommercialLoansPercentage	0.184	pure
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	18100000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17300000	USD
CY2019Q4	caty	Minimum Stock Requirement On Outstanding Federal Home Loan Bank Borrowings Shares MinimumStockRequirementOnOutstandingFederalHomeLoanBankBorrowingsShares	180900
CY2018Q4	caty	Minimum Stock Requirement On Outstanding Federal Home Loan Bank Borrowings Shares MinimumStockRequirementOnOutstandingFederalHomeLoanBankBorrowingsShares	150000
CY2019Q4	caty	Maximum Loan Size Portfolio Stratification Homogenous Portfolio MaximumLoanSizePortfolioStratificationHomogenousPortfolio	500000	USD
CY2019Q4	caty	Variable Interest Entity Primary Beneficiary Number Of Entities VariableInterestEntityPrimaryBeneficiaryNumberOfEntities	9	pure
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	pure
CY2019Q4	caty	Average Reserve Balances Required To Be Maintained With Federal Bank AverageReserveBalancesRequiredToBeMaintainedWithFederalBank	110000	USD
CY2018	caty	Average Reserve Balances Required To Be Maintained With Federal Bank AverageReserveBalancesRequiredToBeMaintainedWithFederalBank	5400000	USD
CY2019	caty	Average Excess Balances Maintained With Federal Reserve Bank AverageExcessBalancesMaintainedWithFederalReserveBank	199000000.0	USD
CY2018	caty	Average Excess Balances Maintained With Federal Reserve Bank AverageExcessBalancesMaintainedWithFederalReserveBank	258600000	USD
CY2019Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	7100000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	18900000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	7800000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1443730000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	9852000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1740000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1451842000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1267731000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1778000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	27000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1242509000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	168831000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	168894000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	304348000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	304337000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	50587000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	50593000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	919964000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	928018000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1443730000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1451842000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	293800000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	99900000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	296700000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	447800000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	583000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	372000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	36000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	14000000	USD
CY2019Q4	caty	Temporarily Impaired Securities As Percentage Of Investment Securities TemporarilyImpairedSecuritiesAsPercentageOfInvestmentSecurities	0.340	pure
CY2019	caty	Percentage Of Unrealized Losses For Securities With Unrealized Losses For Less Than Twelve Months PercentageOfUnrealizedLossesForSecuritiesWithUnrealizedLossesForLessThanTwelveMonths	0.002	pure
CY2019	caty	Percentage Of Unrealized Losses For Securities With Unrealized Losses For Greater Than Twelve Months PercentageOfUnrealizedLossesForSecuritiesWithUnrealizedLossesForGreaterThanTwelveMonths	0.004	pure
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1700000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	144339000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	231000	USD
CY2019Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	349366	pure
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1509000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	493705000	USD
CY2019Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	1740	pure
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	176667000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	630000	USD
CY2018Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	899523	pure
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	26370000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1076190000	USD
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	27000	pure
CY2019Q4	caty	Pledged Investment Securities PledgedInvestmentSecurities	20100000	USD
CY2018Q4	caty	Pledged Investment Securities PledgedInvestmentSecurities	28500000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	5700000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2800000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	28000000.0	USD
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	25100000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15075481000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13995788000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	123224000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	122391000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	626000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	1565000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	14951631000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	13871832000	USD
CY2019Q4	us-gaap	Servicing Asset ServicingAsset	263400000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	47263000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	66593000	USD
CY2019	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	19036000	USD
CY2018	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	18580000	USD
CY2019	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	22347000	USD
CY2018	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	37910000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	43952000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	47263000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	75900000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	106900000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	102600000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	122600000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	2100000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3200000	USD
CY2019Q4	caty	Percentage Of Charge Off To Contractual Balances For Impaired Loans PercentageOfChargeOffToContractualBalancesForImpairedLoans	0.021	pure
CY2018Q4	caty	Percentage Of Charge Off To Contractual Balances For Impaired Loans PercentageOfChargeOffToContractualBalancesForImpairedLoans	0.093	pure
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	41315000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	35540000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	77605000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	65315000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	41626000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	40319000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	3236000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	42686000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	41571000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	3802000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	82941000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	75859000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	3236000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	120291000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	106886000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	3802000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	102583000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	122596000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	127067000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	2084000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3166000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3302000	USD
CY2019	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	40523000	USD
CY2018	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	41815000	USD
CY2017	caty	Nonaccrual Portfolio Loans NonaccrualPortfolioLoans	48787000	USD
CY2019	caty	Non Accrual Loans Held For Sale NonAccrualLoansHeldForSale	0	USD
CY2018	caty	Non Accrual Loans Held For Sale NonAccrualLoansHeldForSale	0	USD
CY2017	caty	Non Accrual Loans Held For Sale NonAccrualLoansHeldForSale	8000000	USD
CY2019	caty	Non Accrual Loans NonAccrualLoans	40523000	USD
CY2018	caty	Non Accrual Loans NonAccrualLoans	41815000	USD
CY2017	caty	Non Accrual Loans NonAccrualLoans	56787000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	40523000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	131462000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	14944019000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15075481000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	41815000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	106057000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	13889731000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13995788000	USD
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	24	pure
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	25979000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	21916000	USD
CY2019Q4	caty	Financing Receivables Impaired Troubled Debt Restructuring Specific Reserve FinancingReceivablesImpairedTroubledDebtRestructuringSpecificReserve	2190000	USD
CY2019	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	4063000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	34	pure
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	29130000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	29130000	USD
CY2018Q4	caty	Financing Receivables Impaired Troubled Debt Restructuring Specific Reserve FinancingReceivablesImpairedTroubledDebtRestructuringSpecificReserve	1518000	USD
CY2018	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2017	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	31	pure
CY2017	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	77741000	USD
CY2017	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	77436000	USD
CY2017Q4	caty	Financing Receivables Impaired Troubled Debt Restructuring Specific Reserve FinancingReceivablesImpairedTroubledDebtRestructuringSpecificReserve	1556000	USD
CY2017	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	305000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15075481000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13995788000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	3236000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	75859000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	119988000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	14999622000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	123224000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15075481000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	3802000	USD
CY2018Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	106886000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	118589000	USD
CY2018Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	13888902000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	122391000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13995788000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123279000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-4500000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3206000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	6818000	USD
CY2018	caty	Financing Receivable Allowance For Credit Losses Net Charge Offs FinancingReceivableAllowanceForCreditLossesNetChargeOffs	3612000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	122391000	USD
CY2018Q4	caty	Reserve To Impaired Loans ReserveToImpairedLoans	3802000	USD
CY2018Q4	caty	Reserve To Non Impaired Loans ReserveToNonImpairedLoans	118589000	USD
CY2018Q4	caty	Reserve For Off Balance Sheet Credit Commitments ReserveForOffBalanceSheetCreditCommitments	2250000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	122391000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-7000000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6997000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14830000	USD
CY2019	caty	Financing Receivable Allowance For Credit Losses Net Charge Offs FinancingReceivableAllowanceForCreditLossesNetChargeOffs	7833000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123224000	USD
CY2019Q4	caty	Reserve To Impaired Loans ReserveToImpairedLoans	3236000	USD
CY2019Q4	caty	Reserve To Non Impaired Loans ReserveToNonImpairedLoans	119988000	USD
CY2019Q4	caty	Reserve For Off Balance Sheet Credit Commitments ReserveForOffBalanceSheetCreditCommitments	3855000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	122391000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123279000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	118966000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-7000000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-4500000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-2500000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6997000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3206000	USD
CY2017	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4173000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14830000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	6818000	USD
CY2017	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10986000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123224000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	122391000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123279000	USD
CY2019Q4	caty	Investments In Affordable Housing And Alternative Energy Partnerships InvestmentsInAffordableHousingAndAlternativeEnergyPartnerships	308700000	USD
CY2018Q4	caty	Investments In Affordable Housing And Alternative Energy Partnerships InvestmentsInAffordableHousingAndAlternativeEnergyPartnerships	282700000	USD
CY2019Q4	caty	Affordable Housing Investments AffordableHousingInvestments	276506000	USD
CY2018Q4	caty	Affordable Housing Investments AffordableHousingInvestments	259046000	USD
CY2019Q4	caty	Other Borrowings From Consolidating Affordable Housing Equity Interest OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest	29022000	USD
CY2018Q4	caty	Other Borrowings From Consolidating Affordable Housing Equity Interest OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest	17298000	USD
CY2019Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	114541000	USD
CY2018Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	113046000	USD
CY2019Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	32175000	USD
CY2018Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	23688000	USD
CY2019	caty	Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest	36300000	USD
CY2018	caty	Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest	23800000	USD
CY2019Q4	caty	Alternative Energy Tax Credit Partnership Investments Net AlternativeEnergyTaxCreditPartnershipInvestmentsNet	32200000	USD
CY2019Q4	caty	Alternative Energy Tax Credit Partnership Investments Held In Escrow AlternativeEnergyTaxCreditPartnershipInvestmentsHeldInEscrow	18900000	USD
CY2019Q4	caty	Solar Tax Credits Expected To Be Realized SolarTaxCreditsExpectedToBeRealized	14900000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Next12 Months AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInNext12Months	64137000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Two AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearTwo	26914000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Three AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearThree	17382000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Four AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFour	1695000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments In Year Five AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFive	770000	USD
CY2019Q4	caty	Affordable Housing Investments Scheduled Funding For Unfunded Commitments Thereafter AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsThereafter	3643000	USD
CY2019Q4	caty	Other Liabilities From Affordablehousing Unfunded Commitments OtherLiabilitiesFromAffordablehousingUnfundedCommitments	114541000	USD
CY2019	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	21523000	USD
CY2018	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	18860000	USD
CY2017	caty	Affordable Housing And Other Tax Credits Recognized AffordableHousingAndOtherTaxCreditsRecognized	17727000	USD
CY2019	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	17786000	USD
CY2018	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	15013000	USD
CY2017	caty	Alternative Energy Tax Credit Usage AlternativeEnergyTaxCreditUsage	3301000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	201463000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	196593000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	97224000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	93404000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	104239000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	103189000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6100000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6400000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6500000	USD
CY2019Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	2871444000	USD
CY2018Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	2857443000	USD
CY2019Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	1358152000	USD
CY2018Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	1365763000	USD
CY2019Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	2260764000	USD
CY2018Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	2027404000	USD
CY2019Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	758903000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	738656000	USD
CY2019Q4	us-gaap	Time Deposits TimeDeposits	7443045000	USD
CY2018Q4	us-gaap	Time Deposits TimeDeposits	6713074000	USD
CY2019Q4	us-gaap	Deposits Deposits	14692308000	USD
CY2018Q4	us-gaap	Deposits Deposits	13702340000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	6750080000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	635144000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	20323000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	37430000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	56000	USD
CY2019Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	12000	USD
CY2019Q4	us-gaap	Time Deposits At Carrying Value TimeDepositsAtCarryingValue	7443045000	USD
CY2019Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	22300000	USD
CY2018Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	10500000	USD
CY2017Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	4400000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	2371000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	2718000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	2242000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	21508000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	16202000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities Money Market InterestExpenseDomesticDepositLiabilitiesMoneyMarket	15062000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	1432000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	1583000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities Savings InterestExpenseDomesticDepositLiabilitiesSavings	1772000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	152791000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	86368000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	46768000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	178102000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	106871000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities InterestExpenseDomesticDepositLiabilities	65844000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	USD
CY2019	caty	Securities Sold Under Agreements To Repurchase Average Amount Outstanding During The Year SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear	0	USD
CY2018	caty	Securities Sold Under Agreements To Repurchase Average Amount Outstanding During The Year SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear	49589000	USD
CY2017	caty	Securities Sold Under Agreements To Repurchase Average Amount Outstanding During The Year SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear	136849000	USD
CY2019	caty	Securities Sold Under Agreements To Repurchase Maximum Amount Outstanding At Month End SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd	0	USD
CY2018	caty	Securities Sold Under Agreements To Repurchase Maximum Amount Outstanding At Month End SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd	100000000	USD
CY2017	caty	Securities Sold Under Agreements To Repurchase Maximum Amount Outstanding At Month End SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd	150000000	USD
CY2019	caty	Securities Sold Under Agreements To Repurchase Amount Outstanding SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding	0	USD
CY2018	caty	Securities Sold Under Agreements To Repurchase Amount Outstanding SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding	0	USD
CY2017	caty	Securities Sold Under Agreements To Repurchase Amount Outstanding SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding	100000000	USD
CY2019	caty	Securities Sold Under Agreements To Repurchase Interest Rate At Period End SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd	0	pure
CY2018	caty	Securities Sold Under Agreements To Repurchase Interest Rate At Period End SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd	0	pure
CY2017	caty	Securities Sold Under Agreements To Repurchase Interest Rate At Period End SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd	0.0286	pure
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	0.070	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
CY2019Q2	caty	Accrued Interest On Deferred Bonus AccruedInterestOnDeferredBonus	0.0572	pure
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	99000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	92000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	87000	USD
CY2019Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	2000000.0	USD
CY2018Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	1900000	USD
CY2019Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	119100000	USD
CY2018Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	119100000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2290000000	USD
CY2019	us-gaap	Stockholders Equity Period Increase Decrease StockholdersEquityPeriodIncreaseDecrease	172400000	USD
CY2019	caty	Stockholders Equity Period Increase Decrease Percentage StockholdersEquityPeriodIncreaseDecreasePercentage	0.081	pure
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2120000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	279100000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3400000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20300000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	36300000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	99100000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.24
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.03
CY2019Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	119136000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20943000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	26820000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	59433000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	39466000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	36639000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	28278000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	22327000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	13803000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	57440000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	75788000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	43000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	7700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	1100000	USD
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CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1495000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	31818000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2361000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	848000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2736000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9825000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2343000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	34554000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70234000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	65802000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	122265000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	38936000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	37567000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2945000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3260000	USD
CY2019Q4	caty	Deferred Tax Assets Nonaccrual Interest DeferredTaxAssetsNonaccrualInterest	1005000	USD
CY2018Q4	caty	Deferred Tax Assets Nonaccrual Interest DeferredTaxAssetsNonaccrualInterest	2277000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	2010000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	2095000	USD
CY2019Q4	caty	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	0	USD
CY2018Q4	caty	Deferred Tax Assets Depreciation And Amortization DeferredTaxAssetsDepreciationAndAmortization	3798000	USD
CY2019Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	4540000	USD
CY2018Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	4344000	USD
CY2019Q4	caty	Deferred Tax Assets Unrealized Loss On Interest Rate Swaps DeferredTaxAssetsUnrealizedLossOnInterestRateSwaps	1599000	USD
CY2018Q4	caty	Deferred Tax Assets Unrealized Loss On Interest Rate Swaps DeferredTaxAssetsUnrealizedLossOnInterestRateSwaps	190000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	3864000	USD
CY2019Q4	caty	Deferred Tax Assets Unrealized Losses On Equity Securities Gross DeferredTaxAssetsUnrealizedLossesOnEquitySecuritiesGross	0	USD
CY2018Q4	caty	Deferred Tax Assets Unrealized Losses On Equity Securities Gross DeferredTaxAssetsUnrealizedLossesOnEquitySecuritiesGross	843000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9473000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9473000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	14247000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	17098000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5012000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4782000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	79767000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	89591000	USD
CY2019Q4	caty	Deferred Tax Liabilities Deferred Expense Loan Costs DeferredTaxLiabilitiesDeferredExpenseLoanCosts	9778000	USD
CY2018Q4	caty	Deferred Tax Liabilities Deferred Expense Loan Costs DeferredTaxLiabilitiesDeferredExpenseLoanCosts	8839000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1606000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-0	USD
CY2019Q4	caty	Deferred Tax Liabilities Unrealized Gain On Securities Available For Sale Net DeferredTaxLiabilitiesUnrealizedGainOnSecuritiesAvailableForSaleNet	5990000	USD
CY2018Q4	caty	Deferred Tax Liabilities Unrealized Gain On Securities Available For Sale Net DeferredTaxLiabilitiesUnrealizedGainOnSecuritiesAvailableForSaleNet	-0	USD
CY2019Q4	caty	Deferred Tax Liabilities Unrealized Gain On Equity Securities DeferredTaxLiabilitiesUnrealizedGainOnEquitySecurities	668000	USD
CY2018Q4	caty	Deferred Tax Liabilities Unrealized Gain On Equity Securities DeferredTaxLiabilitiesUnrealizedGainOnEquitySecurities	-0	USD
CY2019Q4	caty	Deferred Tax Liabilities Dividends On Federal Home Loan Bank Common Stock DeferredTaxLiabilitiesDividendsOnFederalHomeLoanBankCommonStock	978000	USD
CY2018Q4	caty	Deferred Tax Liabilities Dividends On Federal Home Loan Bank Common Stock DeferredTaxLiabilitiesDividendsOnFederalHomeLoanBankCommonStock	956000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3307000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4008000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y4M24D
CY2019Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	9600000	USD
CY2018Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	9000000.0	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	73368000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210	pure
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	70914000	USD
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CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	33276000	USD
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CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	29750000	USD
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CY2017	caty	Effective Income Tax Rate Reconciliation Non Taxable Bargain Purchase Gain Amount EffectiveIncomeTaxRateReconciliationNonTaxableBargainPurchaseGainAmount	-1970000	USD
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CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	34517000	USD
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CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-351000	USD
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CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.201	pure
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CY2017	us-gaap	Net Income Loss NetIncomeLoss	176042000	USD
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CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	741768
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	279135000	USD
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	5714000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3852000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6199000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	39223000	USD
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CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0Y1M6D
CY2018	caty	Noninteres Income Not Inscope NoninteresIncomeNotInscope	3722000	USD
CY2017	caty	Noninteres Income Not Inscope NoninteresIncomeNotInscope	10648000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	44751000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	31707000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	36297000	USD
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	22933
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	17559
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	16458
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	827000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	706000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	646000	USD
CY2019Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	22309
CY2018Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	58988
CY2017Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	57014
CY2019Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	783975
CY2019Q4	caty	Percentage Of Outstanding Common Stock Under Employee Stock Ownership Plan PercentageOfOutstandingCommonStockUnderEmployeeStockOwnershipPlan	0.010	pure
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	caty	Defined Contribution Plan Employers Matching Contribution Vesting Percentage After Two Years Of Service DefinedContributionPlanEmployersMatchingContributionVestingPercentageAfterTwoYearsOfService	0.25	pure
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	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	0.050	pure
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3500000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3100000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2300000	USD
CY2019	caty	Percentage Of Participant Borrowing Capacity Of Vested Amount PercentageOfParticipantBorrowingCapacityOfVestedAmount	0.50	pure
CY2019Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	51100000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	838000	USD
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	35880
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1100000	USD
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	46790
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	718000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	82670
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	23.37
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y1M6D
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1211000	USD
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	46790
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	23.37
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	35880
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	23.37
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	675000	USD
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	35880
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	23.37
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9300000	USD
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9800000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	93143
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3400000	USD
CY2018	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	69084
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2800000	USD
CY2017	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	65044
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2500000	USD
CY2019Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.065	pure
CY2019Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2019Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2019Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2019Q4	caty	Common Equtiy Tier1 Capital CommonEqutiyTier1Capital	1959832000	USD
CY2019Q4	caty	Common Tier One Risk Based Capital To Risk Weighted Assets CommonTierOneRiskBasedCapitalToRiskWeightedAssets	0.1297	pure
CY2018Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0650	pure
CY2018Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1904820000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1366	pure
CY2018Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	1098531000	USD
CY2019Q4	caty	Common Equity Tier One Risk Based Capital Required For Capital Adequacy CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy	1057880000	USD
CY2019Q4	caty	Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0700	pure
CY2019Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized	982318000	USD
CY2019Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0650	pure
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1959832000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1297	pure
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	1284569000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0850	pure
CY2019Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	1209006000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0800	pure
CY2019Q4	us-gaap	Capital Capital	2086911000	USD
CY2019Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1381	pure
CY2019Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	1586821000	USD
CY2019Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050	pure
CY2019Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	1511258000	USD
CY2019Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.1000	pure
CY2019Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1959832000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1123	pure
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	697976000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2019Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	872470000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.0500	pure
CY2018Q4	caty	Common Equtiy Tier1 Capital CommonEqutiyTier1Capital	1904820000	USD
CY2018Q4	caty	Common Tier One Risk Based Capital To Risk Weighted Assets CommonTierOneRiskBasedCapitalToRiskWeightedAssets	0.1366	pure
CY2018Q4	caty	Common Equity Tier One Risk Based Capital Required For Capital Adequacy CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy	889287000	USD
CY2018Q4	caty	Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06375	pure
CY2018Q4	caty	Common Equity Tier One Risk Based Capital Required To Be Well Capitalized CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized	906724000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.07875	pure
CY2018Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	1115968000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0800	pure
CY2018Q4	us-gaap	Capital Capital	2029462000	USD
CY2018Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1455	pure
CY2018Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	1377523000	USD
CY2018Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.09875	pure
CY2018Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	1394961000	USD
CY2018Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.1000	pure
CY2018Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1904820000	USD
CY2018Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1189	pure
CY2018Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	640807000	USD
CY2018Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2018Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	800983000	USD
CY2018Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.0500	pure
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	2181000	USD
CY2019Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet NetAmountOfDerivativeAssetsPresentedInTheBalanceSheet	2181000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	0	USD
CY2019Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet Not Offset NetAmountOfDerivativeAssetsPresentedInTheBalanceSheetNotOffset	2181000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	14229000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	-0	USD
CY2018Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet Not Offset NetAmountOfDerivativeAssetsPresentedInTheBalanceSheetNotOffset	7810000	USD
CY2019Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheet	14229000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	14229000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	7810000	USD
CY2018Q4	caty	Net Amount Of Derivative Assets Presented In The Balance Sheet NetAmountOfDerivativeAssetsPresentedInTheBalanceSheet	7810000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1543000	USD
CY2018Q4	caty	Net Amount Of Derivative Liabilities Presented In The Balance Sheet NetAmountOfDerivativeLiabilitiesPresentedInTheBalanceSheet	1543000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	1543000	USD
CY2019Q4	us-gaap	Interest Income Operating InterestIncomeOperating	191226000	USD
CY2019Q3	us-gaap	Interest Income Operating InterestIncomeOperating	197831000	USD
CY2019Q2	us-gaap	Interest Income Operating InterestIncomeOperating	192449000	USD
CY2019Q1	us-gaap	Interest Income Operating InterestIncomeOperating	187761000	USD
CY2018Q4	us-gaap	Interest Income Operating InterestIncomeOperating	183869000	USD
CY2018Q3	us-gaap	Interest Income Operating InterestIncomeOperating	176866000	USD
CY2018Q2	us-gaap	Interest Income Operating InterestIncomeOperating	167520000	USD
CY2018Q1	us-gaap	Interest Income Operating InterestIncomeOperating	159700000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	50015000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	50831000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	49070000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	44445000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	38428000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	31782000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	27489000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	24357000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	141211000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	147000000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	143379000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	143316000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	145441000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	145084000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	140031000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	135343000	USD
CY2019Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-5000000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-2000000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	8648000	USD
CY2019Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2018Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-1500000	USD
CY2018Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2018Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-3000000	USD
CY2019Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	146211000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	149000000	USD
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	143379000	USD
CY2019Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	143316000	USD
CY2018Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	145441000	USD
CY2018Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	146584000	USD
CY2018Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	140031000	USD
CY2018Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	138343000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	10388000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	12794000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	12921000	USD
CY2018Q4	us-gaap	Noninterest Income NoninterestIncome	10795000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	7835000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	7767000	USD
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	5310000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	71192000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	65580000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	69546000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	70970000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	74395000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	65964000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	63088000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	60971000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	83667000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	93808000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86627000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	85267000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	81841000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	88455000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	84710000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	82682000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16290000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20973000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14383000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18588000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17193000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18698000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11046000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18866000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	67377000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	72835000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	72244000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	66679000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	64648000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	69757000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	73664000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	63816000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.91
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.85
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78

Files In Submission

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0001437749-20-003977-index-headers.html	Edgar Link	pending
0001437749-20-003977-index.html	Edgar Link	pending
0001437749-20-003977.txt	Edgar Link	pending
0001437749-20-003977-xbrl.zip	Edgar Link	pending
caty-20191231.xsd	Edgar Link	pending
caty-20191231_cal.xml	Edgar Link	unprocessable
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$CATY
CATHAY GENERAL BANCORP Stock $caty

2019 Form 10-K Financial Statement

#000143774920003977 Filed on March 02, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CATY CATHAY GENERAL BANCORP Stock $caty

2019 Form 10-K Financial Statement

#000143774920003977 Filed on March 02, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CATY
CATHAY GENERAL BANCORP Stock $caty