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Note 4 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | $ 1,324,408 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 1,637,965 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Securities available-for-sale, gross unrealized gains | 6,326 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains | 18,511 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Securities available-for-sale, gross unrealized losses | 11,799 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | 69,808 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Securities available-for-sale | 1,318,935 us-gaap_AvailableForSaleSecurities | 1,586,668 us-gaap_AvailableForSaleSecurities
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 664,206 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 460,095 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Securities available-for-sale, gross unrealized gains | 63 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 99 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Securities available-for-sale, gross unrealized losses | 265 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 1 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
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
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 549,296 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 1,010,294 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember
Securities available-for-sale, gross unrealized gains | 1,393 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 7,049 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember
Securities available-for-sale, gross unrealized losses | 6,386 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 64,529 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember
Securities available-for-sale | 544,303 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember | 952,814 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesMember
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 79 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 5,929 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Securities available-for-sale, gross unrealized gains |  | 231 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
Securities available-for-sale, gross unrealized losses | 34 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | 54 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember
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] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 94,943 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 154,955 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities available-for-sale, gross unrealized gains | 776 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 298 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities available-for-sale, gross unrealized losses | 1,247 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 4,949 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
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] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 6,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 6,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
Securities available-for-sale, gross unrealized losses | 134 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember | 275 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = caty_MutualFundsMember
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] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 6,276 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 569 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Securities available-for-sale, gross unrealized gains | 681 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember | 10,834 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Securities available-for-sale, gross unrealized losses | 3,733 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = caty_PreferredStockOfGovernmentSponsoredEntitiesMember |
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] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 3,608 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Securities available-for-sale, gross unrealized gains | 3,413 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Securities available-for-sale | 7,021 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = caty_OtherEquitySecuritiesMember |
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost |  | 123 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Securities available-for-sale |  | $ 123 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember

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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 Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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