XML 37 R30.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note 1 - Business (Details) | Mar. 31, 2015
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Note 1 - Business (Details) [Line Items] |
Number of Limited Partnerships in Housing Investments | 7 caty_NumberOfLimitedPartnershipsInHousingInvestments
Percentage of Subsidiaries Common Securities Owned by Parent Company | 100.00%caty_PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany
Number of Business Trust | 5 caty_NumberOfBusinessTrust
Southern California [Member] |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 21 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = caty_SouthernCaliforniaMember
Northern California Member |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 12 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = caty_NorthernCaliforniaMember
NEW YORK |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 9 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_NY
ILLINOIS |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 3 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_IL
WASHINGTON |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 3 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_WA
TEXAS |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 2 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_TX
MASSACHUSETTS |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 1 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_MA
NEW JERSEY |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 1 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_NJ
NEVADA |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 1 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = stpr_NV
HONG KONG |
Note 1 - Business (Details) [Line Items] |
Number of Branch Locations | 1 caty_NumberOfBranchLocations / us-gaap_StatementGeographicalAxis = country_HK

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- Details
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Data Type: | xbrli:stringItemType
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- Definition The number of branch locations. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of business trusts. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Limited Partnerships in housing investments. + References No definition available. + Details
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Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of subsidiaries common securities owned by parent company. + References No definition available. + Details
Name: | caty_PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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Data Type: | na
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Period Type: |

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- Details
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Data Type: | na
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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
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