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Note 5 - Investments in Affordable Housing and Alternative Energy Partnerships - Unfunded Commitments Future Estimated Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
2020 | $ 64,137 |
2021 | 26,914 |
2022 | 17,382 |
2023 | 1,695 |
2024 | 770 |
Thereafter | 3,643 |
Total unfunded commitments | $ 114,541 | $ 113,046

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