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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |
Number of Limited Partnerships in Housing Investments | 7 caty_NumberOfLimitedPartnershipsInHousingInvestments | 7 caty_NumberOfLimitedPartnershipsInHousingInvestments
Percentage of Subsidiaries Common Securities Owned by Parent Company | 100.00%caty_PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany |
Gross Loans Comprised of Commercial Mortgage Loans Percentage | 50.30%caty_GrossLoansComprisedOfCommercialMortgageLoansPercentage |
Gross Loans Comprised of Commercial Loans Percentage | 26.70%caty_GrossLoansComprisedOfCommercialLoansPercentage |
Total Deposits Comprised of Time Deposit of 100,000 Or More Percentage | 35.40%caty_TotalDepositsComprisedOfTimeDepositOf100000OrMorePercentage |
Jumbo CDs Deposit With Company for Two Years or More Percentage | 68.50%caty_JumboCdsDepositWithCompanyForTwoYearsOrMorePercentage |
Federal Home Loan Bank Stock (in Dollars) | $ 30,785,000 us-gaap_FederalHomeLoanBankStock | $ 25,000,000 us-gaap_FederalHomeLoanBankStock
Minimum Stock Requirement on Outstanding Federal Home Loan Bank Borrowings Shares (in Shares) | 307,850 caty_MinimumStockRequirementOnOutstandingFederalHomeLoanBankBorrowingsShares |
Advances from Federal Home Loan Banks (in Dollars) | 425,000,000 us-gaap_AdvancesFromFederalHomeLoanBanks | 521,200,000 us-gaap_AdvancesFromFederalHomeLoanBanks
Maximum Loan Size Portfolio Stratification Homogenous Portfolio (in Dollars) | $ 500,000 caty_MaximumLoanSizePortfolioStratificationHomogenousPortfolio |
Number of Reportable Segments | 2 us-gaap_NumberOfReportableSegments |
CALIFORNIA |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |
Residential Mortgages Properties Percentage | 58.00%caty_ResidentialMortgagesPropertiesPercentage / us-gaap_StatementGeographicalAxis = stpr_CA |

X
- Definition Commercial loans as a percentage of gross loans. + References No definition available. + Details
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- Definition Commercial mortgage loans as a percentage of gross loans. + References No definition available. + Details
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Data Type: | num:percentItemType
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X
- Definition Percentage of Jumbo CDs (time deposits of $100,000 or more) that have been on deposit with the Company for two years or more. + References No definition available. + Details
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Namespace Prefix: | caty_
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Period Type: | instant

X
- Definition Maximum loan size portfolio stratification, homogenous portfolio. + References No definition available. + Details
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- Definition Represents the minimum stock requirement on outstanding federal home loan bank borrowings, in shares. + References No definition available. + Details
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- Definition Number of limited Partnerships in housing investments. + References No definition available. + Details
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- Definition Percentage of subsidiaries common securities owned by parent company. + References No definition available. + Details
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- Definition Residential mortgages properties percentage. + References No definition available. + Details
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- Definition Time deposits of $100,000 or more as a percentage of total deposits. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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