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Note 7 - Loans (Details) - Portfolio by Risk Rating (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 9,224,797 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 8,914,080 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans held for sale |  | 973 us-gaap_LoansReceivableHeldForSaleNet
Commercial Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,314,983 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 2,260,474 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 50,083 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 47,619 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 67,662 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 72,561 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,822 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 1,839 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,434,550 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember | 2,382,493 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialLoansMember
Real Estate Construction Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 328,434 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 272,927 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Real Estate Construction Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 16,626 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 25,227 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Real Estate Construction Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 500 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 500 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Real Estate Construction Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 345,560 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember | 298,654 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 4,375,229 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 4,213,453 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Mortgage Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 123,384 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 105,970 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Mortgage Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 154,848 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 167,020 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Mortgage Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,590 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember |
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 4,663,051 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember | 4,486,443 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_CommercialMortgageLoansMember
Residential Mortgage and Equity Lines [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,765,727 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 1,733,248 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Residential Mortgage and Equity Lines [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 304 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Residential Mortgage and Equity Lines [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 10,235 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 9,690 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Residential Mortgage and Equity Lines [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,776,266 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember | 1,742,938 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_ResidentialMortgageAndEquityLinesMember
Installment And Other Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,370 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_InstallmentAndOtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 3,552 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_InstallmentAndOtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Installment And Other Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,370 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_InstallmentAndOtherLoansMember | 3,552 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_InstallmentAndOtherLoansMember
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 8,789,743 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 8,483,654 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 173,771 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 153,589 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 249,371 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 274,498 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Loans held for sale |  | 973 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 11,912 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | $ 2,339 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 35 -Paragraph 49 -URI http://asc.fasb.org/extlink&oid=35742846&loc=d3e3084-111518 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490209&loc=d3e48214-111002 + Details
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