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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest income | $ 191,226 | $ 197,831 | $ 192,449 | $ 187,761 | $ 183,869 | $ 176,866 | $ 167,520 | $ 159,700 |  |  |
Interest expense | 50,015 | 50,831 | 49,070 | 44,445 | 38,428 | 31,782 | 27,489 | 24,357 | $ 194,361 | $ 122,056 | $ 80,442
Gain from acquisition. |  |  |  |  |  |  |  |  | 0 | 340 | 5,628
Non-interest expense | 71,192 | 65,580 | 69,546 | 70,970 | 74,395 | 65,964 | 63,088 | 60,971 | 277,288 | 264,419 | 236,199
Total income tax expense, amount | 16,290 | 20,973 | 14,383 | 18,588 | 17,193 | 18,698 | 11,046 | 18,866 | 70,234 | 65,802 | 122,265
Income before undistributed earnings of subsidiaries | 83,667 | 93,808 | 86,627 | 85,267 | 81,841 | 88,455 | 84,710 | 82,682 |  |  |
Net income | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 64,648 | $ 69,757 | $ 73,664 | $ 63,816 | 279,135 | 271,885 | 176,042
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 90 | 57 | 221
Interest expense |  |  |  |  |  |  |  |  | 8,415 | 9,813 | 7,637
Non-interest income/(loss) |  |  |  |  |  |  |  |  | 4,634 | (1,940) | 1,909
Gain from acquisition. |  |  |  |  |  |  |  |  | 0 | 340 | 5,628
Non-interest expense |  |  |  |  |  |  |  |  | 3,491 | 3,782 | 6,726
Income before income tax benefit |  |  |  |  |  |  |  |  | 231,816 | 112,687 | 258,602
Total income tax expense, amount |  |  |  |  |  |  |  |  | (2,459) | (4,971) | (5,687)
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 234,275 | 117,658 | 264,289
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 44,860 | 154,227 | (88,247)
Net income |  |  |  |  |  |  |  |  | 279,135 | 271,885 | 176,042
Parent Company [Member] | Cathay Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank and Far East National Bank |  |  |  |  |  |  |  |  | $ 238,998 | $ 127,825 | $ 265,207

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