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Note 17 - Subsequent Events (Details) (Subsequent Event [Member], Junior Notes [Member], USD $) | 1 Months Ended
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Apr. 23, 2014
Subsequent Event [Member] | Junior Notes [Member] |
Note 17 - Subsequent Events (Details) [Line Items] |
Debt Instrument, Repurchased Face Amount | $ 2,000,000
Repurchase Price Discount to Par | 72.25%
Extraordinary Item, Gain (Loss), Gross | $ 555,000

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- Details
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Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the portion of par that was paid for the repurchase of debt. + References No definition available. + Details
Name: | caty_RepurchasePriceDiscountToPar
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the gains or losses whether arising from extinguishment of debt, prior period adjustments, or from other events or transactions, that are both unusual in nature and infrequent in occurrence thereby meeting the criteria for an event or transaction to be classified as an extraordinary item. This element is gross of the related tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6904752&loc=d3e14571-107780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Extraordinary Items -URI http://asc.fasb.org/extlink&oid=6512381 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6904752&loc=d3e14428-107780 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 930 -SubTopic 715 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473685&loc=d3e23713-110274 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration