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Note 5 - Loans (Details) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | $ 190,226 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 221,152 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 277,776 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Loans, interest income recognized | 5,339 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 5,599 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 9,305 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 26,128 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 27,123 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 31,798 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember
Loans, interest income recognized | 878 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 770 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember | 580 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 32,439 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 37,875 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 49,094 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember
Loans, interest income recognized | 264 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 284 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember | 265 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 114,248 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 138,121 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 178,822 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember
Loans, interest income recognized | 3,735 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 4,256 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember | 8,221 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_CommercialMortgageLoansMember
Residential Mortgage And Equity Lines Member |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 17,411 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | 18,033 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | 18,062 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember
Loans, interest income recognized | $ 462 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | $ 289 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / caty_FinancingReceivableImpairedAxis = caty_ResidentialMortgageAndEquityLinesMember | $ 239 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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