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Note 2 - Cash and Cash Equivalents (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Average Reserve Balances Required To Be Maintained With Federal Bank | $ 12.9 | $ 12.2

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- Definition Average reserve balances required to be maintained with the federal bank. + References No definition available. + Details
Name: | caty_AverageReserveBalancesRequiredToBeMaintainedWithFederalBank
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration