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Note 13 - Stockholders' Equity and Earnings per Share (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 09, 2013 | Dec. 05, 2008 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2004 | Dec. 31, 2014
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Regulation Restricted On Amount of Retained Earnings Available for Cash Dividends |  |  |  |  |  |  |  |  | 57,200,000 caty_RegulationRestrictedOnAmountOfRetainedEarningsAvailableForCashDividends
Proceeds from Issuance of Preferred Stock and Preference Stock |  | 258,000,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  | (2,434,000)us-gaap_DividendsPreferredStock | (2,067,000)us-gaap_DividendsPreferredStock | (5,184,000)us-gaap_DividendsPreferredStock | 9,685,000 us-gaap_DividendsPreferredStock | 16,488,000 us-gaap_DividendsPreferredStock |  |
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 Aggregate Market Price |  | 38,700,000 caty_WarrantsAggregateMarketPrice |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Series A Non Cumulative Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  |  |  |  |  | 8,600,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = caty_SeriesANonCumulativePreferredStockMember |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 7.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = caty_SeriesANonCumulativePreferredStockMember |
Dividends, Preferred Stock |  |  |  |  |  | 605,000 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = caty_SeriesANonCumulativePreferredStockMember | 605,000 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = caty_SeriesANonCumulativePreferredStockMember |  |
Series B Preferred Stock [Member] | First Five Years [Member] |  |  |  |  |  |  |  |  |
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_RangeAxis = caty_FirstFiveYearsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |
Series B Preferred Stock [Member] | After Five Years [Member] |  |  |  |  |  |  |  |  |
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_RangeAxis = caty_AfterFiveYearsMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | 258,000,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |
Preferred Stock, Shares Issued (in Shares) |  | 258,000 us-gaap_PreferredStockSharesIssued / 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 |  |  |
Equity Option [Member] |  |  |  |  |  |  |  |  |
Note 13 - Stockholders' Equity and Earnings per Share (Details) [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) |  |  |  |  |  | 2,200,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  |  | 2,000,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember

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- Definition Regulation, restricted on amount of retained earnings available for cash dividends. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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