Note 12 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financial Assets
Cash and due from banks	$ 182,159	$ 176,830	$ 161,657	$ 153,747
Cash and due from banks	182,159	176,830
Short-term investments	618,726us-gaap_ShortTermInvestments	489,614us-gaap_ShortTermInvestments
Short-term investments	618,726us-gaap_ShortTermInvestments	489,614us-gaap_ShortTermInvestments
Securities available-for-sale	1,203,682us-gaap_AvailableForSaleSecurities	1,318,935us-gaap_AvailableForSaleSecurities
Loans held for sale		973us-gaap_LoansReceivableHeldForSaleNet
Loans held for sale		1,225
Loans, net	9,057,592us-gaap_LoansReceivableNet	8,740,268us-gaap_LoansReceivableNet
Loans, net	9,001,232	8,688,072
Investment in Federal Home Loan Bank stock	25,000us-gaap_FederalHomeLoanBankStock	30,785us-gaap_FederalHomeLoanBankStock
Investment in Federal Home Loan Bank stock	25,000	30,785
Warrants	21caty_WarrantsCarryingValue	27caty_WarrantsCarryingValue
Warrants	21caty_WarrantsFairValueDisclosure	27caty_WarrantsFairValueDisclosure
Foreign exchange contracts	127,172	167,005
Foreign exchange contracts	1,615	1,876
Deposits	9,113,250us-gaap_Deposits	8,783,460us-gaap_Deposits
Deposits	9,114,489us-gaap_DepositsFairValueDisclosure	8,785,342us-gaap_DepositsFairValueDisclosure
Securities sold under agreements to repurchase	400,000	450,000
Securities sold under agreements to repurchase	422,161	473,816
Advances from Federal Home Loan Bank	485,000	425,000
Advances from Federal Home Loan Bank	484,983	424,974
Other borrowings	22,482us-gaap_OtherBorrowings	19,934us-gaap_OtherBorrowings
Other borrowings	19,396caty_OtherBorrowingsFairValueDisclosure	17,978caty_OtherBorrowingsFairValueDisclosure
Long-term debt	119,136us-gaap_LongTermDebt	119,136us-gaap_LongTermDebt
Long-term debt	60,020us-gaap_LongTermDebtFairValue	59,425us-gaap_LongTermDebtFairValue
Foreign exchange contracts	158,331	178,868
Foreign exchange contracts	4,959	5,007
Interest rate swaps	299,497	300,480
Interest rate swaps	8,610	4,626
Off-Balance Sheet Financial Instruments
Commitments to extend credit	2,027,773caty_CommitmentsToExtendNotionalAmount	2,071,766caty_CommitmentsToExtendNotionalAmount
Commitments to extend credit	(3,740)caty_CommitmentsToExtendCreditFairValue	(3,442)caty_CommitmentsToExtendCreditFairValue
Standby letters of credit	49,585	53,910
Standby letters of credit	(238)caty_StandbyLettersOfCreditFairValue	(243)caty_StandbyLettersOfCreditFairValue
Other letters of credit	50,558caty_OtherLettersOfCreditNotionalAmount	48,142caty_OtherLettersOfCreditNotionalAmount
Other letters of credit	(34)caty_OtherLettersOfCreditFairValue	(29)caty_OtherLettersOfCreditFairValue
Bill of lading guarantees	159	108
Bill of lading guarantees	$ 0caty_BillOfLadingGuaranteesFairValue

The bill of lading guarantees, fair value.

No definition available.

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- Definition

The bill of lading guarantees, notional amount.

+ References

No definition available.

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- Definition

The commitments to extend credit, fair value.

+ References

No definition available.

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- Definition

The commitments to extend notional amount.

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No definition available.

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- Definition

The foreign currency contract asset fair value loss disclosure.

+ References

No definition available.

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The foreign exchange contract asset fair value gain disclosure.

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No definition available.

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- Definition

The notional amount of foreign currency derivative purchase contracts with gain.

+ References

No definition available.

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- Definition

The notional amount of foreign currency derivative purchase contracts with loss.

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No definition available.

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- Definition

Other borrowings fair value disclosure.

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No definition available.

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- Definition

Other letters of credit, fair value.

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No definition available.

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- Definition

Other letters of credit, notional amount.

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No definition available.

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- Definition

Standby letters of credit, fair value.

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No definition available.

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- Definition

Standby letters of credit notional amount.

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No definition available.

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- Definition

The carrying value of warrants.

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No definition available.

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- Definition

Warrants, fair value disclosure.

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No definition available.

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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.

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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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-Glossary Cash

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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.

+ References

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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.

+ References

No definition available.

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- Definition

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

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-Glossary Notional Amount

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- Definition

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

+ References

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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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-Topic 325

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- Definition

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

+ References

No definition available.

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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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-SubTopic 10

-Glossary Loan

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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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No definition available.

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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.

+ References

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- Definition

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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- Definition

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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- Definition

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)

-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 03

-Paragraph 1

-Subparagraph g

-Article 7

+ Details

Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant