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Note 9 - Deposits (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Disclosure Text Block [Abstract] |  |  |
Accrued Interest Payable On Customer Deposits | $ 2.3 caty_AccruedInterestPayableOnCustomerDeposits | $ 2.0 caty_AccruedInterestPayableOnCustomerDeposits | $ 2.1 caty_AccruedInterestPayableOnCustomerDeposits

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- Definition Accrued interest payable on customer deposits. + References No definition available. + Details
Name: | caty_AccruedInterestPayableOnCustomerDeposits
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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