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Note 14 - Commitments and Contingencies (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments To Extend Credit | $ 1,700,000,000 |  |
CommitmentsToFundFixedRateLoans | 115,400,000 |  |
Commitments To Fund Adjustable Rate Loans | 1,600,000,000 |  |
Operating Lease Lease Term Minimum | 1 year |  |
Operating Lease Lease Term Maximum | 50 years |  |
Operating Leases, Rent Expense | 7,400,000 | 6,700,000 | 6,600,000
Operating Leases, Income Statement, Sublease Revenue | $ 300,000 | $ 200,000 | $ 300,000

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- Definition Commitments to extend credit. + References No definition available. + Details
Name: | caty_CommitmentsToExtendCredit
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to fund adjustable rate loans. + References No definition available. + Details
Name: | caty_CommitmentsToFundAdjustableRateLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to fund fixed rate loans. + References No definition available. + Details
Name: | caty_CommitmentsToFundFixedRateLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating lease, lease term, maximum. + References No definition available. + Details
Name: | caty_OperatingLeaseLeaseTermMaximum
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating lease, lease term, minimum. + References No definition available. + Details
Name: | caty_OperatingLeaseLeaseTermMinimum
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 88-1 -Paragraph 9 -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_OperatingLeasesIncomeStatementSubleaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration