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Note 7 - Loans (Details) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Financing Receivable, Impaired [Line Items] |  |
Loans, average recorded investment | $ 175,989 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 195,365 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Loans, interest income recognized | 1,335 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 1,520 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans, average recorded investment | 25,426 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 30,844 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember
Loans, interest income recognized | 229 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 226 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans, average recorded investment | 22,990 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 34,060 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember
Loans, interest income recognized | 65 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 65 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans, average recorded investment | 110,293 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 111,305 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember
Loans, interest income recognized | 917 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 1,134 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember
Residential Mortgage and Equity Lines [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Loans, average recorded investment | 17,280 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | 19,156 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember
Loans, interest income recognized | $ 124 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | $ 95 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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