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Note 11 - Capital Resources (Details) (USD $) | 0 Months Ended | 1 Months Ended | 10 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 09, 2013 | Dec. 05, 2008 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 29, 2006 | Mar. 31, 2011 | Dec. 31, 2012
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 258,000,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) |  | 1,846,374 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) |  | $ 20.96 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  | 38,700,000 us-gaap_WarrantsAndRightsOutstanding |  |  |  |  |  |  |  |
Percent of Senior Preferred Stock Invested |  | 15.00%caty_PercentOfSeniorPreferredStockInvested |  |  |  |  |  |  |  |
Sale of Warrant Consideration Received On Transaction | 13,100,000 caty_SaleOfWarrantConsiderationReceivedOnTransaction |  |  |  |  |  |  |  |  |
Sale of Warrants Price Per Share (in Dollars per share) | $ 7.20 caty_SaleOfWarrantsPricePerShare |  |  |  |  |  |  |  |  |
Subordinated Debt |  |  |  |  |  |  |  | 50,000,000 us-gaap_SubordinatedDebt |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |  |  |  |  |  |
Subordinated Debt Prepayment Penalty |  |  | 2,000 caty_SubordinatedDebtPrepaymentPenalty |  |  |  |  |  |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  | 4,500,000 us-gaap_InterestExpenseSubordinatedNotesAndDebentures | 3,000,000 us-gaap_InterestExpenseSubordinatedNotesAndDebentures | 3,200,000 us-gaap_InterestExpenseSubordinatedNotesAndDebentures |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | 258,000,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  |  | $ 258,000,000 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Subordinated Debt Obligations [Member] |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 10 years |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember |  |  | 1.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember | 1.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember | 3.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember
Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 3.61%us-gaap_DebtWeightedAverageInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember |  |  | 3.61%us-gaap_DebtWeightedAverageInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_SubordinatedDebtObligationsMember
First Five Years [Member] |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_CreationDateAxis = caty_FirstFiveYearsMember |  |  |  |  |  |  |  |
After Five Years [Member] |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_CreationDateAxis = caty_AfterFiveYearsMember |  |  |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures. + 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 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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