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Note 7 - Investments in Affordable Housing (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 7 - Investments in Affordable Housing (Details) [Line Items] |  |  |
Affordable Housing Investments | $ 104,579,000 caty_AffordableHousingInvestments | $ 84,108,000 caty_AffordableHousingInvestments |
Number of Limited Partnerships in Housing Investments | 7 caty_NumberOfLimitedPartnershipsInHousingInvestments | 7 caty_NumberOfLimitedPartnershipsInHousingInvestments |
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest | 24,800,000 caty_IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest | 23,800,000 caty_IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest |
Other Borrowings from Consolidating Affordable Housing Equity Interest | 19,900,000 caty_OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest | 19,100,000 caty_OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest |
Other Liabilities from Affordable Housing Unfunded Commitments | 22,000,000 caty_OtherLiabilitiesFromAffordableHousingUnfundedCommitments | 7,000,000 caty_OtherLiabilitiesFromAffordableHousingUnfundedCommitments |
Minimum Compliance Period Tax Credits Investments in Affordable Housing | 15 years |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 10,200,000 us-gaap_IncomeTaxReconciliationTaxCreditsInvestment | 9,800,000 us-gaap_IncomeTaxReconciliationTaxCreditsInvestment | 9,200,000 us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Domestic Tax Authority [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Note 7 - Investments in Affordable Housing (Details) [Line Items] |  |  |
Remaining and Future Available Tax Credit | 57,700,000 caty_RemainingAndFutureAvailableTaxCredit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / invest_InvestmentAxis = caty_AffordableHousingLimitedPartnershipsMember |  |
State and Local Jurisdiction [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Note 7 - Investments in Affordable Housing (Details) [Line Items] |  |  |
Remaining and Future Available Tax Credit | $ 1,400,000 caty_RemainingAndFutureAvailableTaxCredit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / invest_InvestmentAxis = caty_AffordableHousingLimitedPartnershipsMember |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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