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Note 4 - Investment Securities (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Note 4 - Investment Securities (Details) [Line Items] |  |  |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value | $ 722,500,000 us-gaap_HeldToMaturitySecuritiesTransferredSecurityAtCarryingValue |  |  |
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) | 40,500,000 us-gaap_HeldToMaturitySecuritiesTransferredSecurityUnrealizedGainLoss |  |  |
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale |  | 698,500,000 us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale | 456,400,000 us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) |  | 69,700,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS | 213,200,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS |
Proceeds From Sales and Repayments of Other Investment Securities |  | 160,500,000 caty_ProceedsFromSalesAndRepaymentsOfOtherInvestmentSecurities | 575,400,000 caty_ProceedsFromSalesAndRepaymentsOfOtherInvestmentSecurities |
Proceeds from Maturities Repayments and Calls of Other Investment Securities |  | 585,800,000 caty_ProceedsFromMaturitiesRepaymentsAndCallsOfOtherInvestmentSecurities | 231,100,000 caty_ProceedsFromMaturitiesRepaymentsAndCallsOfOtherInvestmentSecurities |
Realized Gain from Sale and Call of Other Investment Securities |  | 18,000,000 caty_RealizedGainFromSaleAndCallOfOtherInvestmentSecurities | 29,000,000 caty_RealizedGainFromSaleAndCallOfOtherInvestmentSecurities |
Realized Loss from Sale and Call of Other Investment Securities |  | 11,300,000 caty_RealizedLossFromSaleAndCallOfOtherInvestmentSecurities | 1,600,000 caty_RealizedLossFromSaleAndCallOfOtherInvestmentSecurities |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 11,799,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | 69,808,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Available-for-sale Securities, Amortized Cost Basis |  | 1,324,408,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 1,637,965,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Temporarily Impaired Securities As Percentage of Investment Securities |  | 66.10%caty_TemporarilyImpairedSecuritiesAsPercentageOfInvestmentSecurities |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months |  | 1.10%caty_PercentageOfUnrealizedLossesForSecuritiesWithUnrealizedLossesForLessThanTwelveMonths |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months |  | 1.60%caty_PercentageOfUnrealizedLossesForSecuritiesWithUnrealizedLossesForGreaterThanTwelveMonths |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year |  | 22 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear | 19 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year |  | 8 us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear | 30 us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear |
Pledged Investment Securities |  | 591,300,000 caty_PledgedInvestmentSecurities | 926,500,000 caty_PledgedInvestmentSecurities |
Collateralized Mortgage Backed Securities [Member] |  |  |  |
Note 4 - Investment Securities (Details) [Line Items] |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 6,386,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 64,529,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale Securities, Amortized Cost Basis |  | 549,296,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 1,010,294,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year |  | 16 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 7 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year |  |  | 25 us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember |
Corporate Bonds Issued By Financial Institutions [Member] |  |  |  |
Note 4 - Investment Securities (Details) [Line Items] |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,200,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = caty_CorporateBondsIssuedByFinancialInstitutionsMember |  |
Preferred Stock of Government Sponsored Entities [Member] |  |  |  |
Note 4 - Investment Securities (Details) [Line Items] |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 3,733,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember |  |
Other than Temporary Impairment Losses, Investments |  |  |  | 820,000 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Available-for-sale Securities, Amortized Cost Basis |  | $ 6,276,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | $ 569,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year |  | 2 us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember |  |

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- Definition For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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