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Note 16 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Securities available-for-sale |  |
Securities available-for-sale | $ 1,318,935 us-gaap_AvailableForSaleSecurities | $ 1,586,668 us-gaap_AvailableForSaleSecurities
Assets | 1,320,838 us-gaap_AssetsFairValueDisclosure | 1,597,816 us-gaap_AssetsFairValueDisclosure
Liabilities |  |
Liabilities | 9,633 us-gaap_LiabilitiesFairValueDisclosure | 6,140 us-gaap_LiabilitiesFairValueDisclosure
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 664,004 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 460,193 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 664,004 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 460,193 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 544,303 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_MortgagebackedSecuritiesMember | 952,814 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_MortgagebackedSecuritiesMember
Mortgage-backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 544,303 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_MortgagebackedSecuritiesMember | 952,814 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_MortgagebackedSecuritiesMember
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 45 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 6,106 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 45 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 6,106 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 94,472 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 150,304 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 94,472 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 150,304 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,866 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 5,725 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,866 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 5,725 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,224 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 11,403 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,224 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 11,403 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,021 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,021 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 27 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_WarrantMember | 30 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_WarrantMember
Warrant [Member] |  |
Securities available-for-sale |  |
Assets | 27 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_WarrantMember | 30 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_WarrantMember
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Assets | 1,876 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember | 6,182 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Liabilities |  |
Liabilities | 5,007 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember | 6,140 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 1,876 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember | 6,182 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Liabilities |  |
Liabilities | 5,007 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember | 6,140 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Liabilities | 4,626 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateSwapMember |
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 4,626 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateSwapMember |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale |  | 123 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale |  | 123 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Assets |  | 4,936 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = caty_TradingSecuritiesMember
Trading Securities Member |  |
Securities available-for-sale |  |
Assets |  | 4,936 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = caty_TradingSecuritiesMember
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 669,870 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 465,918 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Assets | 669,870 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 465,918 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 649,065 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,120,750 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Assets | 650,941 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,131,868 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities |  |
Liabilities | 9,633 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 6,140 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | $ 27 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 30 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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