Note 17 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial Assets
Cash and due from banks	$ 176,830	$ 153,747	$ 144,909	$ 117,888
Cash and due from banks	176,830	153,747
Short-term investments	489,614us-gaap_ShortTermInvestments	516,938us-gaap_ShortTermInvestments
Short-term investments	489,614us-gaap_ShortTermInvestments	516,938us-gaap_ShortTermInvestments
Securities available-for-sale	1,318,935us-gaap_AvailableForSaleSecurities	1,586,668us-gaap_AvailableForSaleSecurities
Trading securities		4,936us-gaap_TradingSecuritiesCost
Trading securities		4,936us-gaap_TradingSecurities
Loans held for sale	973us-gaap_LoansReceivableHeldForSaleNet
Loans held for sale	1,225
Loans, net	8,740,268us-gaap_LoansReceivableNet	7,897,187us-gaap_LoansReceivableNet
Loans, net	8,688,072	7,760,490
Investment in Federal Home Loan Bank stock	30,785us-gaap_FederalHomeLoanBankStock	25,000us-gaap_FederalHomeLoanBankStock
Investment in Federal Home Loan Bank stock	30,785	25,000
Warrants	27caty_WarrantsCarryingValue	30caty_WarrantsCarryingValue
Warrants	27caty_WarrantsFairValueDisclosure	30caty_WarrantsFairValueDisclosure
Option contracts		200caty_Options
Option contracts		0caty_OptionContractsFairValue
Foreign exchange contracts	167,005	267,644
Foreign exchange contracts	1,876	6,182
Financial Liabilities
Deposits	8,783,460us-gaap_Deposits	7,981,305us-gaap_Deposits
Deposits	8,785,342us-gaap_DepositsFairValueDisclosure	7,977,639us-gaap_DepositsFairValueDisclosure
Securities sold under agreements to repurchase	450,000	800,000
Securities sold under agreements to repurchase	473,816	852,835
Advances from Federal Home Loan Bank	425,000	521,200
Advances from Federal Home Loan Bank	424,974	521,560
Other borrowings	19,934us-gaap_OtherBorrowings	19,062us-gaap_OtherBorrowings
Other borrowings	17,978caty_OtherBorrowingsFairValueDisclosure	16,107caty_OtherBorrowingsFairValueDisclosure
Long-term debt	119,136us-gaap_LongTermDebt	121,136us-gaap_LongTermDebt
Long-term debt	59,425us-gaap_LongTermDebtFairValue	58,970us-gaap_LongTermDebtFairValue
Foreign exchange contracts	178,868	236,350
Foreign exchange contracts	5,007	6,140
Interest rate swaps	300,480
Interest rate swaps	4,626
Off-Balance Sheet Financial Instruments
Commitments to extend credit	2,071,766caty_CommitmentsToExtendNotionalAmount	1,858,669caty_CommitmentsToExtendNotionalAmount
Commitments to extend credit	(3,442)caty_CommitmentsToExtendCreditFairValue	(2,187)caty_CommitmentsToExtendCreditFairValue
Standby letters of credit	53,910	45,058
Standby letters of credit	(243)caty_StandbyLettersOfCreditFairValue	(205)caty_StandbyLettersOfCreditFairValue
Other letters of credit	48,142caty_OtherLettersOfCreditNotionalAmount	54,098caty_OtherLettersOfCreditNotionalAmount
Other letters of credit	(29)caty_OtherLettersOfCreditFairValue	(34)caty_OtherLettersOfCreditFairValue
Bill of lading guarantees	108	80
Bill of lading guarantees	$ 0caty_BillOfLadingGuaranteesFairValue

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Foreign currency contract asset fair value loss disclosure.

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Notional amount of foreign currency derivative purchase contracts with gain.

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Notional amount of foreign currency derivative purchase contracts with loss.

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Options

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Other borrowings fair value disclosure.

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Other Letters of Credit, Fair Value

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Other Letters Of Credit Notional Amount

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Standby Letters of Credit, Fair Value

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Standby Letters Of Credit Notional Amount

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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.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Nominal or face amount used to calculate payments on the derivative liability.

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-Glossary Notional Amount

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(a)(i))

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ 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 210.5-02.2)

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-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Subparagraph g

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Name Accounting Standards Codification

-Topic 320

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-Section 45

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-Name Accounting Standards Codification

-Glossary Trading Securities

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

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Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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No definition available.

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