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Note 14 - Commitments and Contingencies (Details) - Financial Instruments with Off-balance Sheet Risk (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments $ 2,173,927us-gaap_OtherCommitment $ 1,957,905us-gaap_OtherCommitment
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments 2,071,766us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= us-gaap_CommitmentsToExtendCreditMember		 1,858,669us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments 53,910us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= us-gaap_StandbyLettersOfCreditMember		 45,058us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments 48,143us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= caty_CommercialLettersOfCreditMember		 54,098us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= caty_CommercialLettersOfCreditMember
Bill of Lading Guarantees [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments $ 108us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= caty_BillOfLadingGuaranteesMember		 $ 80us-gaap_OtherCommitment
/ caty_CommitmentsAndContingenciesAxis
= caty_BillOfLadingGuaranteesMember