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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
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments | $ 2,173,927 us-gaap_OtherCommitment | $ 1,957,905 us-gaap_OtherCommitment
Commitments to Extend Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments | 2,071,766 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = us-gaap_CommitmentsToExtendCreditMember | 1,858,669 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments | 53,910 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = us-gaap_StandbyLettersOfCreditMember | 45,058 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = us-gaap_StandbyLettersOfCreditMember
Commercial Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments | 48,143 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = caty_CommercialLettersOfCreditMember | 54,098 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = caty_CommercialLettersOfCreditMember
Bill of Lading Guarantees [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments | $ 108 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = caty_BillOfLadingGuaranteesMember | $ 80 us-gaap_OtherCommitment / caty_CommitmentsAndContingenciesAxis = caty_BillOfLadingGuaranteesMember

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

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | caty_CommitmentsAndContingenciesAxis=caty_BillOfLadingGuaranteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_CommitmentsAndContingenciesAxis=caty_CommercialLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_CommitmentsAndContingenciesAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_CommitmentsAndContingenciesAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |