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Note 9 - Securities Sold Under Agreements to Repurchase (Detail) - Securities Sold Under Agreements to Repurchase (Non-Callable Fixed Rate Securities Sold Under Agreements to Repurchase [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013
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No. of Agreements | 4
Amount (in Dollars) | $ 200,000
Weighted Average Interest Rate | 2.78%
Maturing in Three to Five Years [Member] |
No. of Agreements | 2
Amount (in Dollars) | 100,000
Weighted Average Interest Rate | 2.71%
Maturing in More Than Five Years [Member] |
No. of Agreements | 2
Amount (in Dollars) | $ 100,000
Weighted Average Interest Rate | 2.86%

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- Definition Number Of Securities Sold Under Agreements To Repurchase + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Weighted Average Interest Rate + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | num:percentItemType
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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