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Note 6 - Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block [Abstract] |
Other Real Estate, Roll Forward [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In thousands) |
Balance, beginning of year |  | $ | 2,110 |  |  | $ | 13,384 |  |  | $ | 19,556 |
Provision/(Reversal) for losses |  |  | 547 |  |  |  | 1,619 |  |  |  | (2,122 | )
OREO disposal |  |  | (350 | ) |  |  | (12,893 | ) |  |  | (4,050 | )
Balance, end of year |  | $ | 2,307 |  |  | $ | 2,110 |  |  | $ | 13,384 |
Schedule of Other Real Estate Owned Expense [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In thousands) |
Operating expense |  | $ | 665 |  |  | $ | 1,142 |  |  | $ | 3,680 |
Provision/(reversal) for losses |  |  | 547 |  |  |  | 1,619 |  |  |  | (2,122 | )
Net gain on transfers and disposals |  |  | (2,012 | ) |  |  | (4,065 | ) |  |  | (1,793 | )
Total other real estate owned expense |  | $ | (800 | ) |  | $ | (1,304 | ) |  | $ | (235 | )

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- Definition Tabular disclosure of other real estate owned expense. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the change in other real estate on properties owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration