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Note 5 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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With allocated allowance |  |
Allowance | $ 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance | $ 13,284 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Total impaired loans | 210,620 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | 263,848 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Total impaired loans | 174,519 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 200,780 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Total impaired loans | 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 13,284 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 19,479 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember | 20,992 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember
Loans with no related allowance, recorded investment | 18,452 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember | 18,905 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 32,924 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 25,401 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Loans with no related allowance, recorded investment | 17,025 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 15,097 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 77,474 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 105,593 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Loans with no related allowance, recorded investment | 75,172 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 78,930 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Residential Mortgage And Equity Lines Member |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 2,518 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 4,892 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Loans with no related allowance, recorded investment | 2,518 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 4,892 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
With No Allocated Allowance Member |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 132,395 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_WithNoAllocatedAllowanceMember | 156,878 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_WithNoAllocatedAllowanceMember
Loans with no related allowance, recorded investment | 113,167 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_WithNoAllocatedAllowanceMember | 117,824 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_WithNoAllocatedAllowanceMember
Commercial Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 7,003 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 22,737 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Loans with related allowance, recorded investment | 5,037 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 13,063 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Allowance | 1,263 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 2,519 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Total impaired loans | 1,263 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 2,519 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 19,006 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 28,475 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Loans with related allowance, recorded investment | 8,703 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 19,323 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Allowance | 1,077 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 3,460 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Total impaired loans | 1,077 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 3,460 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 38,197 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 39,223 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Loans with related allowance, recorded investment | 34,022 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 35,613 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Allowance | 8,993 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 6,584 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Total impaired loans | 8,993 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 6,584 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Residential Mortgage And Equity Lines Member |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 14,019 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 16,535 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Loans with related allowance, recorded investment | 13,590 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 14,957 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Allowance | 465 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 721 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Total impaired loans | 465 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 721 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
With Allocated Allowance Member |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 78,225 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember | 106,970 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember
Loans with related allowance, recorded investment | 61,352 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember | 82,956 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember
Allowance | 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember | 13,284 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember
Total impaired loans | $ 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember | $ 13,284 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_WithAllocatedAllowanceMember

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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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- Definition Unpaid principal balance of impaired financing receivables for which there is 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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