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Note 10 - Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Summary of Comparative Data of Securities Sold Under Agreements to Repurchase [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (Dollars in thousands) |
Average amount outstanding during the year (1) |  | $ | 400,822 |  |  | $ | 629,315 |  |  | $ | 972,329 |
Maximum amount outstanding at month-end (2) |  |  | 400,000 |  |  |  | 700,000 |  |  |  | 1,200,000 |
Balance, December 31 |  |  | 400,000 |  |  |  | 450,000 |  |  |  | 800,000 |
Rate, December 31 |  |  | 3.89 | % |  |  | 3.85 | % |  |  | 3.87 | %
Weighted average interest rate for the year |  |  | 3.95 | % |  |  | 3.92 | % |  |  | 3.88 | %

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- Definition Tabular disclosure of comparative data of securities sold under agreements to repurchase. + References No definition available. + Details
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Namespace Prefix: | caty_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration