Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 182,159us-gaap_CashAndDueFromBanks	$ 176,830us-gaap_CashAndDueFromBanks
Short-term investments and interest bearing deposits	618,726	489,614
Securities available-for-sale (amortized cost of $1,197,922 in 2015 and $1,324,408 in 2014)	1,203,682us-gaap_AvailableForSaleSecurities	1,318,935us-gaap_AvailableForSaleSecurities
Loans held for sale		973us-gaap_LoansReceivableHeldForSaleNet
Loans	9,224,797	8,914,080
Less: Allowance for loan losses	(156,089)	(161,420)
Unamortized deferred loan fees, net	(11,116)	(12,392)
Loans, net	9,057,592	8,740,268
Federal Home Loan Bank stock	25,000us-gaap_FederalHomeLoanBankStock	30,785us-gaap_FederalHomeLoanBankStock
Other real estate owned, net	30,799	31,477
Affordable housing investments, net	129,829caty_AffordableHousingInvestments	104,579caty_AffordableHousingInvestments
Premises and equipment, net	98,512us-gaap_PropertyPlantAndEquipmentNet	99,682us-gaap_PropertyPlantAndEquipmentNet
Customers’ liability on acceptances	17,956us-gaap_DueFromCustomerAcceptances	35,656us-gaap_DueFromCustomerAcceptances
Accrued interest receivable	26,584us-gaap_InterestReceivable	25,364us-gaap_InterestReceivable
Goodwill	316,340us-gaap_Goodwill	316,340us-gaap_Goodwill
Other intangible assets, net	3,084	3,237
Other assets	199,826us-gaap_OtherAssets	143,106us-gaap_OtherAssets
Total assets	11,910,089us-gaap_Assets	11,516,846us-gaap_Assets
Deposits
Non-interest-bearing demand deposits	1,691,173	1,664,914
Interest-bearing deposits:
NOW deposits	822,940	778,691
Money market deposits	1,551,453us-gaap_DepositsMoneyMarketDeposits	1,538,187us-gaap_DepositsMoneyMarketDeposits
Savings deposits	557,924us-gaap_DepositsSavingsDeposits	533,940us-gaap_DepositsSavingsDeposits
Time deposits under $100,000	1,241,529us-gaap_TimeDepositsLessThan100000	1,162,547us-gaap_TimeDepositsLessThan100000
Time deposits of $100,000 or more	3,248,231us-gaap_TimeDeposits100000OrMore	3,105,181us-gaap_TimeDeposits100000OrMore
Total deposits	9,113,250us-gaap_Deposits	8,783,460us-gaap_Deposits
Securities sold under agreements to repurchase	400,000	450,000
Advances from the Federal Home Loan Bank	485,000	425,000
Other borrowings for affordable housing investments	22,482	19,934
Long-term debt	119,136us-gaap_LongTermDebt	119,136us-gaap_LongTermDebt
Acceptances outstanding	17,956	35,656
Other liabilities	118,019us-gaap_OtherLiabilities	80,772us-gaap_OtherLiabilities
Total liabilities	10,275,843us-gaap_Liabilities	9,913,958us-gaap_Liabilities
Commitments and contingencies
Stockholders’ Equity
Common stock, $0.01 par value, 100,000,000 shares authorized, 84,108,607 issued and 79,901,042 outstanding at March 31, 2015, and 84,022,118 issued and 79,814,553 outstanding at December 31, 2014	841us-gaap_CommonStockValue	840us-gaap_CommonStockValue
Additional paid-in-capital	787,956us-gaap_AdditionalPaidInCapital	789,519us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss, net	(646)	(5,569)
Retained earnings	971,831	943,834
Treasury stock, at cost (4,207,565 shares at March 31, 2015, and at December 31, 2014)	(125,736)us-gaap_TreasuryStockValue	(125,736)us-gaap_TreasuryStockValue
Total equity	1,634,246	1,602,888
Total liabilities and equity	$ 11,910,089	$ 11,516,846

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Short-term investments and interest bearing deposits.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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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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Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts.

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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

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Amounts receivable from customers on short-term negotiable time drafts drawn on and accepted by the institution (also known as banker's acceptance transactions) that are outstanding on the reporting date.

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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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