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Note 14 - Commitments and Contingencies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Commitments to Extend Notional Amount | $ 2,071,766,000 caty_CommitmentsToExtendNotionalAmount | $ 1,858,669,000 caty_CommitmentsToExtendNotionalAmount |
Commitments to Fund Fixed Rate Loans | 125,800,000 caty_CommitmentsToFundFixedRateLoans |  |
Commitments to Fund Adjustable Rate Loans | 1,900,000,000 caty_CommitmentsToFundAdjustableRateLoans |  |
Operating Lease, Lease Term Minimum | 1 year |  |
Operating Lease, Lease Term Maximum | 25 years |  |
Operating Leases, Rent Expense | 8,200,000 us-gaap_LeaseAndRentalExpense | 7,700,000 us-gaap_LeaseAndRentalExpense | 7,400,000 us-gaap_LeaseAndRentalExpense
Operating Leases, Income Statement, Sublease Revenue | $ 200,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | $ 300,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | $ 300,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue

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- Definition Commitments To Extend Notional Amount + References No definition available. + Details
Name: | caty_CommitmentsToExtendNotionalAmount
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to fund adjustable rate loans. + References No definition available. + Details
Name: | caty_CommitmentsToFundAdjustableRateLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to fund fixed rate loans. + References No definition available. + Details
Name: | caty_CommitmentsToFundFixedRateLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating lease, maximum lease term. + References No definition available. + Details
Name: | caty_OperatingLeaseLeaseTermMaximum
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating lease, minimum lease term. + References No definition available. + Details
Name: | caty_OperatingLeaseLeaseTermMinimum
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration