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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest income | $ 167,596 | $ 172,234 | $ 174,008 | $ 186,736 | $ 191,226 | $ 197,831 | $ 192,449 | $ 187,761 |  |  |
Interest expense | 27,776 | 34,730 | 39,533 | 46,425 | 50,015 | 50,831 | 49,070 | 44,445 | $ 148,464 | $ 194,361 | $ 122,056
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | 0 | 340
Non-interest expense | 75,046 | 75,997 | 67,268 | 65,154 | 71,192 | 65,580 | 69,546 | 70,970 | 283,465 | 277,288 | 264,419
Income tax benefit | 10,332 | 2,190 | 3,492 | 9,091 | 16,290 | 20,973 | 14,383 | 18,588 | 25,105 | 70,234 | 65,802
Income before undistributed earnings of subsidiaries | 81,225 | 58,984 | 57,813 | 55,943 | 83,667 | 93,808 | 86,627 | 85,267 |  |  |
Net income | $ 70,893 | $ 56,794 | $ 54,321 | $ 46,852 | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | 228,860 | 279,135 | 271,885
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank |  |  |  |  |  |  |  |  | 146,000 | 238,998 | 127,825
Interest income |  |  |  |  |  |  |  |  | 49 | 90 | 57
Interest expense |  |  |  |  |  |  |  |  | 5,906 | 8,415 | 9,813
Non-interest (loss)/income |  |  |  |  |  |  |  |  | (435) | 4,634 | (1,940)
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | 0 | 340
Non-interest expense |  |  |  |  |  |  |  |  | 4,846 | 3,491 | 3,782
Income before income tax benefit |  |  |  |  |  |  |  |  | 134,862 | 231,816 | 112,687
Income tax benefit |  |  |  |  |  |  |  |  | (3,692) | (2,459) | (4,971)
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 138,554 | 234,275 | 117,658
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 90,306 | 44,860 | 154,227
Net income |  |  |  |  |  |  |  |  | $ 228,860 | $ 279,135 | $ 271,885

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