XML 37 R30.htm IDEA: XBRL DOCUMENT v2.4.1.9
Note 1 - Business (Details)
Mar. 31, 2015
Note 1 - Business (Details) [Line Items]  
Number of Limited Partnerships in Housing Investments 7caty_NumberOfLimitedPartnershipsInHousingInvestments
Percentage of Subsidiaries Common Securities Owned by Parent Company 100.00%caty_PercentageOfSubsidiariesCommonSecuritiesOwnedByParentCompany
Number of Business Trust 5caty_NumberOfBusinessTrust
Southern California [Member]  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 21caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= caty_SouthernCaliforniaMember
Northern California Member  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 12caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= caty_NorthernCaliforniaMember
NEW YORK  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 9caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_NY
ILLINOIS  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 3caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_IL
WASHINGTON  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 3caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_WA
TEXAS  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 2caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_TX
MASSACHUSETTS  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 1caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_MA
NEW JERSEY  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 1caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_NJ
NEVADA  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 1caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= stpr_NV
HONG KONG  
Note 1 - Business (Details) [Line Items]  
Number of Branch Locations 1caty_NumberOfBranchLocations
/ us-gaap_StatementGeographicalAxis
= country_HK