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Note 6 - Investment Securities (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |  |  |
Available-for-sale Securities | $ 1,203,682,000 us-gaap_AvailableForSaleSecurities |  | $ 1,318,935,000 us-gaap_AvailableForSaleSecurities
Investment Securities |  |  | 1,320,000,000 caty_InvestmentSecurities
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale | 406,900,000 us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale | 123,700,000 us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 12,100,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS | 20,500,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS |
Proceeds from Sales and Repayments of Other Investment Securities | 335,100,000 caty_ProceedsFromSalesAndRepaymentsOfOtherInvestmentSecurities | 16,000,000 caty_ProceedsFromSalesAndRepaymentsOfOtherInvestmentSecurities |
Proceeds from Maturities Repayments and Calls of Other Investment Securities | 0 caty_ProceedsFromMaturitiesRepaymentsAndCallsOfOtherInvestmentSecurities | 112,900,000 caty_ProceedsFromMaturitiesRepaymentsAndCallsOfOtherInvestmentSecurities |
Realized Gain from Sale and Call of Investment Securities | 1,700,000 caty_RealizedGainFromSaleAndCallOfInvestmentSecurities | 6,000,000 caty_RealizedGainFromSaleAndCallOfInvestmentSecurities |
Realized Loss from Sale and Call of Investment Securities | 1,700,000 caty_RealizedLossFromSaleAndCallOfInvestmentSecurities | 67,000 caty_RealizedLossFromSaleAndCallOfInvestmentSecurities |
Pledged Investment Securities | $ 575,500,000 caty_PledgedInvestmentSecurities |  | $ 591,300,000 caty_PledgedInvestmentSecurities

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- Definition Represents investment securities. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Pledged investment securities at carrying value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Proceeds from maturities repayments and calls of other investment securities. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Proceeds from sales and repayments of other investment securities. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Realized gain from sale and call of investment securities + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Realized loss from sale and call of investment securities. + References No definition available. + 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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- Details
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- Definition The cash inflow from the maturity (principal due), prepayment and call (request of early payment) of a loan financed by home mortgage payments classified as held to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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