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Note 9 - Deposits (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Accrued Interest Payable on Customer Deposits | $ 2.1 | $ 4.2 | $ 5.2

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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