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Note 20 - Condensed Financial Information of Cathay General Bancorp - Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest income | $ 183,869 | $ 176,866 | $ 167,520 | $ 159,700 | $ 155,640 | $ 154,078 | $ 135,629 | $ 130,804 |  |  |
Interest expense | 38,428 | 31,782 | 27,489 | 24,357 | 22,593 | 20,882 | 18,277 | 18,690 | $ 122,056 | $ 80,442 | $ 81,200
Gain from acquisition |  |  |  |  |  |  |  |  | 340 | 5,628 |
Non-interest expense | 74,395 | 65,964 | 63,088 | 60,971 | 66,407 | 61,248 | 56,658 | 51,886 | 264,419 | 236,199 | 224,690
Total income tax expense, amount | 17,193 | 18,698 | 11,046 | 18,866 | 51,166 | 35,163 | 15,431 | 20,505 | 65,802 | 122,265 | 67,101
Income before undistributed earnings of subsidiaries | 81,841 | 88,455 | 84,710 | 82,682 | 77,106 | 84,909 | 66,846 | 69,446 |  |  |
Net income | $ 64,648 | $ 69,757 | $ 73,664 | $ 63,816 | $ 25,940 | $ 49,746 | $ 51,415 | $ 48,941 | 271,885 | 176,042 | 175,099
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 57 | 221 | 48
Interest expense |  |  |  |  |  |  |  |  | 9,813 | 7,637 | 5,791
Non-interest (loss)/income |  |  |  |  |  |  |  |  | (1,940) | 1,909 | (488)
Gain from acquisition |  |  |  |  |  |  |  |  | 340 | 5,628 |
Non-interest expense |  |  |  |  |  |  |  |  | 3,782 | 6,726 | 3,756
Income before income tax benefit |  |  |  |  |  |  |  |  | 112,687 | 258,602 | 104,411
Total income tax expense, amount |  |  |  |  |  |  |  |  | (4,971) | (5,687) | (4,199)
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 117,658 | 264,289 | 108,610
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 154,227 | (88,247) | 66,489
Net income |  |  |  |  |  |  |  |  | 271,885 | 176,042 | 175,099
Parent Company [Member] | Cathay Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank and Far East National Bank |  |  |  |  |  |  |  |  | 127,825 | 265,207 | 113,448
Parent Company [Member] | GBC Venture Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank and Far East National Bank |  |  |  |  |  |  |  |  |  |  | $ 950

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