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Note 2 - Cash and Cash Equivalents (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Note 2 - Cash and Cash Equivalents (Details) [Line Items] |  |
Average Reserve Balances Required to be Maintained With Federal Bank | $ 0 caty_AverageReserveBalancesRequiredToBeMaintainedWithFederalBank | $ 6,500,000 caty_AverageReserveBalancesRequiredToBeMaintainedWithFederalBank
Average Excess Balances Required to be Maintained With Federal Reserve Bank | 170,100,000 caty_AverageExcessBalancesRequiredToBeMaintainedWithFederalReserveBank | 136,300,000 caty_AverageExcessBalancesRequiredToBeMaintainedWithFederalReserveBank
Interest Rate Swap [Member] |  |
Note 2 - Cash and Cash Equivalents (Details) [Line Items] |  |
Margin Deposit Assets | $ 7,500,000 us-gaap_MarginDepositAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |

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- Definition Amount of average excess balances required to be maintained with Federal Reserve Bank. + 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 Average reserve balances required to be maintained with federal bank. + 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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- Details
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Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |