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Note 20 - Condensed Financial Information of Cathay General Bancorp (Details) - Statements of Operations - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 119,519 | $ 116,867 | $ 112,386 | $ 104,934 | $ 106,043 | $ 106,335 | $ 105,062 | $ 101,207 |  |  |
Interest expense | 20,103 | 19,221 | 17,632 | 17,008 | 18,292 | 19,580 | 19,445 | 18,549 | $ 73,964 | $ 75,866 | $ 82,300
Non-interest expense | 53,533 | 57,471 | 47,585 | 44,131 | 41,125 | 42,607 | 42,513 | 48,068 | 202,720 | 174,313 | 193,833
Income tax (benefit)/expense | 16,787 | 12,098 | 9,738 | 21,364 | 21,021 | 22,313 | 20,741 | 17,890 | 59,987 | 81,965 | 70,435
Income before undistributed earnings of subsidiaries | 58,233 | 50,581 | 54,938 | 57,344 | 56,599 | 58,222 | 55,825 | 49,149 | 221,096 | 219,795 | 194,170
Net income | $ 41,446 | $ 38,483 | $ 45,200 | $ 35,980 | $ 35,578 | $ 35,909 | $ 35,084 | $ 31,259 | 161,109 | 137,830 | 123,143
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank |  |  |  |  |  |  |  |  | 163,301 | 30,000 | 138,030
Interest income |  |  |  |  |  |  |  |  | 68 | 88 | 157
Interest expense |  |  |  |  |  |  |  |  | 5,776 | 4,469 | 2,994
Non-interest (loss)/income |  |  |  |  |  |  |  |  | (1,858) | 10,144 | 434
Non-interest expense |  |  |  |  |  |  |  |  | 4,644 | 2,248 | 2,443
Income before income tax benefit |  |  |  |  |  |  |  |  | 151,091 | 33,515 | 133,184
Income tax (benefit)/expense |  |  |  |  |  |  |  |  | (5,134) | 1,478 | (2,037)
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 156,225 | 32,037 | 135,221
Distributions more than earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | (12,078)
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 4,884 | 105,793 |
Net income |  |  |  |  |  |  |  |  | $ 161,109 | $ 137,830 | $ 123,143

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