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Note 6 - Investment Securities (Details) - Temporarily Impaired Securities (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 147,911,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | $ 376,601,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 3,919,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss | 3,998,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Securities Available-for-Sale - 12 Months or longer - Fair Value | 49,804 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 494,754 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,277,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss | 7,801,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Securities Available-for-Sale - Fair Value | 197,715,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 871,355,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Securities Available-for-Sale - Unrealized Losses | 5,196 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss | 11,799 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 145,297,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 332,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 7 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Securities Available-for-Sale - Fair Value | 145,304,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Securities Available-for-Sale - Unrealized Losses | 333 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 41 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 45 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 32,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 34,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Securities Available-for-Sale - Fair Value | 41,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 45,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Securities Available-for-Sale - Unrealized Losses | 32 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 34 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 43,835 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 63,753 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,165,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 1,247,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Available-for-Sale - Fair Value | 43,835,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 63,753,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Available-for-Sale - Unrealized Losses | 1,165 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 1,247 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 5,921 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 5,866 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 79,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 134,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Securities Available-for-Sale - Fair Value | 5,921,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 5,866,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Securities Available-for-Sale - Unrealized Losses | 79 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 134 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 2,597,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 2,448,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 3,584,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 3,733,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Securities Available-for-Sale - Fair Value | 2,597,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 2,448,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Securities Available-for-Sale - Unrealized Losses | 3,584 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 3,733 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 17,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 3,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Securities Available-for-Sale - Fair Value | 17,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Securities Available-for-Sale - Unrealized Losses | 3 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 374,153,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 265,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Securities Available-for-Sale - Fair Value |  | 374,153,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Securities Available-for-Sale - Unrealized Losses |  | 265 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Mortgage Backed Securities Non Agency [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value |  | 425,090 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = caty_MortgageBackedSecuritiesNonAgencyMember
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses |  | 6,386,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MortgageBackedSecuritiesNonAgencyMember
Securities Available-for-Sale - Fair Value |  | 425,090,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = caty_MortgageBackedSecuritiesNonAgencyMember
Securities Available-for-Sale - Unrealized Losses |  | $ 6,386 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = caty_MortgageBackedSecuritiesNonAgencyMember

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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