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Note 5 - Loans (Details) - Non-Accrual Loans (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Loans (Details) - Non-Accrual Loans [Line Items] |  |  |
Non-accrual portfolio loans | $ 70,163 caty_NonaccrualPortfolioLoans | $ 83,183 caty_NonaccrualPortfolioLoans | $ 103,902 caty_NonaccrualPortfolioLoans
Non-accrual loans held-for-sale | 973 caty_NonAccrualLoansHeldForSale |  |
Total non-accrual loans | 71,136 caty_NonAccrualLoans | 83,183 caty_NonAccrualLoans | 103,902 caty_NonAccrualLoans
Contractual interest due | 5,339 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 5,599 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 9,305 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Nonaccrual Loans [Member] |  |  |
Note 5 - Loans (Details) - Non-Accrual Loans [Line Items] |  |  |
Contractual interest due | 6,663 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 5,851 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 6,621 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember
Interest recognized | 217 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 22 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 1,006 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember
Net interest foregone | $ 6,446 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | $ 5,829 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | $ 5,615 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember

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- Definition Loans in non-accrual status. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loans in non-accrual status classified as held-for-sale loans. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loans in non-accrual status classified as portfolio loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- 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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- Definition Amount of interest income recognized on a cash-basis method of accounting 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)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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- Details
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