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Note 10 - Borrowed Funds (Details) - Outstanding Advances (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
| 90 years |
| $ 475,000 caty_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithin90DaysOfBalanceSheetDate | $ 400,000 caty_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithin90DaysOfBalanceSheetDate
| 0.06%caty_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithin90DaysOfBalanceSheetDate | 0.27%caty_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithin90DaysOfBalanceSheetDate
| 90 years |
| 46,200 caty_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveOfBalanceSheetDate | 25,000 caty_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveOfBalanceSheetDate
| 1.24%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate | 1.13%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate
| 0 |
| $ 521,200 us-gaap_AdvancesFromFederalHomeLoanBanks | $ 425,000 us-gaap_AdvancesFromFederalHomeLoanBanks
| 0.17%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate | 0.32%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate
Minimum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
| 4 years |
| 4 years |
Maximum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
| 5 years |
| 5 years |

X
- Definition The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due within 90 days of the Balance Sheet date. + References No definition available. + Details
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X
- Definition Amount of federal home loan bank advances maturing 4 to 5 years following the latest fiscal year. + References No definition available. + Details
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- Definition Federal Home Loan Bank Advances Maturities Summary Due Within 90 Days Of Balance Sheet Date. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Describes the weighted average interest rate applicable to the specific advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due from four to five years of the Balance Sheet date. + 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 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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