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