XML 36 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Note 1 - Business (Detail) | Mar. 31, 2013
--- | ---
Number of Limited Partnerships in Housing Investments | 6
Equity Method Investment, Ownership Percentage | 100.00%
Number of Business Trust | 5
Southern California Member |
Number Of Branch Locations | 20
Northern California Member |
Number Of Branch Locations | 11
New York State Member |
Number Of Branch Locations | 8
Illinois Member |
Number Of Branch Locations | 3
Washington State Member |
Number Of Branch Locations | 3
Texas Member |
Number Of Branch Locations | 2
Massachusetts Member |
Number Of Branch Locations | 1
New Jersey Member |
Number Of Branch Locations | 1
Hong Kong Member |
Number Of Branch Locations | 1

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 Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant