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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Unfunded Commitments Future Estimated Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
2019 | $ 55,962 |
2020 | 29,267 |
2021 | 11,669 |
2022 | 11,182 |
2023 | 1,473 |
Thereafter | 3,493 |
Total unfunded commitments | $ 113,046 | $ 124,657

X
- Definition Amount of scheduled funding for unfunded commitments in the next 12 months for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInNext12Months
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of scheduled funding for unfunded commitments in the fifth fiscal year following the latest fiscal year for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFive
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of scheduled funding for unfunded commitments in the fourth fiscal year following the latest fiscal year for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearFour
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of scheduled funding for unfunded commitments in the third fiscal year following the latest fiscal year for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearThree
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of scheduled funding for unfunded commitments in the second fiscal year following the latest fiscal year for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsInYearTwo
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of scheduled funding for unfunded commitments after the fifth fiscal year following the latest fiscal year for affordable housing investments. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsScheduledFundingForUnfundedCommitmentsThereafter
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other liabilities from affordable housing unfunded commitments. + References No definition available. + Details
Name: | caty_OtherLiabilitiesFromAffordablehousingUnfundedCommitments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant