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Note 2 - Business Combinations (Details Textual) - SinoPac Bancorp [Member] $ in Millions | Jul. 14, 2017 USD ($) shares
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Business Combination, Aggregate Purchase Price | $ 351.6
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 926,192
Business Combination, Deferred Purchase Price | $ 100.0
Business Combination, Purchase Price Held, Percentage | 10.00%

X
- Definition Represents the amount of aggregate purchase price in a business combination. + References No definition available. + Details
Name: | caty_BusinessCombinationAggregatePurchasePrice
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of deferred cash outflow associated with the acquisition of business and will be released within one year of the merger. + References No definition available. + Details
Name: | caty_BusinessCombinationDeferredPurchasePrice
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of purchase price being held and will be released over three years following the closing of acquisition. + References No definition available. + Details
Name: | caty_BusinessCombinationPurchasePriceHeldPercentage
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=caty_SinoPacBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |