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Note 19 - Condensed Financial Information of Cathay General Bancorp - Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015
Interest income | $ 155,640 | $ 154,078 | $ 135,629 | $ 130,804 | $ 130,668 | $ 124,155 | $ 121,902 | $ 122,345 |  |  |  |
Interest expense | 22,593 | 20,882 | 18,277 | 18,690 | 20,766 | 20,331 | 20,126 | 19,977 | $ 80,442 | $ 81,200 | $ 73,964 |
Gain from acquisition |  |  |  |  |  |  |  |  | 5,628 |  |  |
Non-interest expense | 66,407 | 61,248 | 56,658 | 51,886 | 53,503 | 50,737 | 68,879 | 51,571 | 236,199 | 224,690 | 202,720 |
Income tax benefit | 51,166 | 35,163 | 15,431 | 20,505 | 16,345 | 15,808 | 12,273 | 22,675 | 122,265 | 67,101 | 59,987 | $ 59,987
Income before undistributed earnings of subsidiaries | 77,106 | 84,909 | 66,846 | 69,446 | 64,360 | 61,898 | 47,104 | 68,838 | 298,307 | 242,200 | 221,096 |
Net income | $ 25,940 | $ 49,746 | $ 51,415 | $ 48,941 | $ 48,015 | $ 46,090 | $ 34,831 | $ 46,163 | 176,042 | 175,099 | 161,109 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 221 | 48 | 68 |
Interest expense |  |  |  |  |  |  |  |  | 7,637 | 5,791 | 5,776 |
Non-interest income/(loss) |  |  |  |  |  |  |  |  | 1,909 | (488) | (1,858) |
Gain from acquisition |  |  |  |  |  |  |  |  | 5,628 |  |  |
Non-interest expense |  |  |  |  |  |  |  |  | 6,726 | 3,756 | 4,644 |
Income before income tax benefit |  |  |  |  |  |  |  |  | 258,602 | 104,411 | 151,091 |
Income tax benefit |  |  |  |  |  |  |  |  | (5,687) | (4,199) | (5,134) |
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 264,289 | 108,610 | 156,225 |
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | (88,247) | 66,489 | 4,884 |
Net income |  |  |  |  |  |  |  |  | 176,042 | 175,099 | 161,109 |
Parent Company [Member] | Cathay Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank and Far East National Bank |  |  |  |  |  |  |  |  | 265,207 | 113,448 | 163,301 |
Parent Company [Member] | GBC Venture Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank and Far East National Bank |  |  |  |  |  |  |  |  |  | $ 950 |  |

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