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Note 7 - Loans (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Note 7 - Loans (Details) [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | $ 189,311,000 | $ 200,780,000
Percentage Of Charge-Off To Contractual Balances For Impaired Loans | 15.00% | 23.90%
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 |
Nonaccrual Loans [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 70,400,000 | 83,200,000
Accruing Troubled Debt Restructuring [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 118,900,000 | 117,600,000
Reduction Of Stated Interest Rate Member | Minimum [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Troubled Debt Restructurings Length of Modifications | 12 months |
Reduction Of Stated Interest Rate Member | Maximum [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Troubled Debt Restructurings Length of Modifications | 3 years |
Accruing Troubled Debt Restructuring [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Troubled Debt Restructurings, Total | 118,900,000 | 117,600,000
Impaired Financing Receivable, Modifications, Related Allowance | 7,300,000 | 6,900,000
Non Accruing Troubled Debt Restructuring Member |  |
Note 7 - Loans (Details) [Line Items] |  |
Troubled Debt Restructurings, Total | 37,800,000 | 38,800,000
Impaired Financing Receivable, Modifications, Related Allowance | $ 1,800,000 | $ 2,200,000
Minimum [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Period Loan Is In Payment Default | 60 days |
Maximum [Member] |  |
Note 7 - Loans (Details) [Line Items] |  |
Period Loan Is In Payment Default | 90 days |

X
- Definition Amount of allowance for credit losses related to recorded investment on modified loans. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Percentage of charge-off to contractual balances for impaired loans. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period Loan Is In Payment Default + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Troubled debt restructurings length of modifications. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
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- Definition Troubled Debt Restructurings, Total + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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Balance Type: | na
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X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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Namespace Prefix: | us-gaap_
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