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Note 6 - Other Real Estate Owned (Details) - Other Real Estate Owned Expense (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Real Estate Owned Expense [Abstract] |  |  |
Operating expense | $ 1,142 caty_OtherRealEstateOwnedOperatingExpense | $ 3,680 caty_OtherRealEstateOwnedOperatingExpense | $ 4,817 caty_OtherRealEstateOwnedOperatingExpense
Provision/(reversal) for losses | 1,619 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | (2,122)us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 10,668 us-gaap_RealEstateOwnedValuationAllowanceProvision1
Net gain on transfers and disposals | (4,065)us-gaap_GainsLossesOnSalesOfOtherRealEstate | (1,793)us-gaap_GainsLossesOnSalesOfOtherRealEstate | (369)us-gaap_GainsLossesOnSalesOfOtherRealEstate
Total other real estate owned expense | $ (1,304)us-gaap_ForeclosedRealEstateExpense | $ (235)us-gaap_ForeclosedRealEstateExpense | $ 15,116 us-gaap_ForeclosedRealEstateExpense

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

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- Definition Other real estate owned, operating expense. + References No definition available. + Details
Name: | caty_OtherRealEstateOwnedOperatingExpense
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense recognized during the period for the foreclosure on real estate assets. + References No definition available. + Details
Name: | us-gaap_ForeclosedRealEstateExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 + Details
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Balance Type: | credit
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- Definition Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Period Type: | duration