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Note 7 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | $ 159,216 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance | $ 132,395 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Loans with no related allowance, recorded investment | 123,660 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | 113,167 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 58,599 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | 78,225 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Loans with related allowance, recorded investment | 57,057 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 61,352 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Allowance | 11,044 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Total impaired loans | 217,815 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | 210,620 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Total impaired loans | 180,717 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 174,519 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Total impaired loans | 11,044 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 15,677 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 7,003 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Loans with related allowance, recorded investment | 15,660 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 5,037 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Allowance | 3,911 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 1,263 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember
Total impaired loans | 3,911 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialLoansMember | 1,263 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
Loans with related allowance, recorded investment |  | 8,703 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Allowance |  | 1,077 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Total impaired loans |  | 1,077 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 27,529 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 38,197 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Loans with related allowance, recorded investment | 26,581 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 34,022 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Allowance | 6,635 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 8,993 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Total impaired loans | 6,635 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 8,993 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Residential Mortgage and Equity Lines [Member] |  |
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 15,393 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 14,019 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Loans with related allowance, recorded investment | 14,816 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 13,590 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Allowance | 498 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 465 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Total impaired loans | 498 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 465 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_ImpairedFinancingReceivableWithRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Commercial Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 14,176 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember | 19,479 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember
Loans with no related allowance, recorded investment | 13,148 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember | 18,452 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 49,076 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 32,924 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Loans with no related allowance, recorded investment | 22,874 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember | 17,025 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 93,468 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 77,474 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember
Loans with no related allowance, recorded investment | 85,142 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_CommercialMortgageLoansMember | 75,172 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 | 2,496 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | 2,518 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember
Loans with no related allowance, recorded investment | $ 2,496 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember | $ 2,518 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / caty_ImpairedFinancingReceivableWithNoRelatedAllowance1Axis = caty_ResidentialMortgageAndEquityLinesMember

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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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