XML 31 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 1 - Business (Details) | Sep. 30, 2013
--- | ---
Note 1 - Business (Details) [Line Items] |
Number of Limited Partnerships in Housing Investments | 6
Equity Method Investment, Ownership Percentage | 100.00%
Number of Business Trust | 5
Southern California Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 20
Northern California Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 11
New York State Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 8
Illinois [Member] |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 3
Washington State Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 3
Texas Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 2
Massachusetts [Member] |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 1
New Jersey Member |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 1
Nevada [Member] |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 1
Hong Kong [Member] |
Note 1 - Business (Details) [Line Items] |
Number Of Branch Locations | 1

X
- Details
Name: | caty_Note1BusinessDetailsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of branch locations + References No definition available. + Details
Name: | caty_NumberOfBranchLocations
Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of business trust + References No definition available. + Details
Name: | caty_NumberOfBusinessTrust
Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of limited Partnerships in housing investments. + References No definition available. + Details
Name: | caty_NumberOfLimitedPartnershipsInHousingInvestments
Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant