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Note 19 - Condensed Financial Information of Cathay General Bancorp - Statements of Cash Flows (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
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 70,893 | $ 56,794 | $ 54,321 | $ 46,852 | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 228,860 | $ 279,135 | $ 271,885
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 58,131 | 39,898 | 40,871
Net change in other assets |  |  |  |  |  |  |  |  | (21,247) | 6,163 | (13,984)
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | 0 | (340)
Net change in other liabilities |  |  |  |  |  |  |  |  | (18,948) | 21,061 | 13,848
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 319,955 | 434,979 | 336,538
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (242,204) | (1,381,674) | (1,134,327)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (7,663) | (81,065) | (23,040)
Cash dividends |  |  |  |  |  |  |  |  | (98,688) | (99,131) | (83,428)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 0 | 838
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (1,911) | (2,311) | (3,550)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (23,593) | (36,301) | (42,648)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 749,549 | 940,183 | 863,278
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 228,860 | 279,135 | 271,885
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (90,306) | (44,860) | (154,227)
Loss/(gain) on equity securities |  |  |  |  |  |  |  |  | 641 | (4,414) | 2,242
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 107 | 105 | 271
Loss/(gain) in fair value of warrants |  |  |  |  |  |  |  |  | 18 | 145 | (93)
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 800 | 749 | 649
Net change in other assets |  |  |  |  |  |  |  |  | (1,182) | 125 | 915
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | 0 | (340)
Net change in other liabilities |  |  |  |  |  |  |  |  | (9,853) | (832) | (1,375)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 129,085 | 230,153 | 119,927
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Increase in short-term investment |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Proceeds from liquidation of subsidiary |  |  |  |  |  |  |  |  | 2,399 | 0 | 0
Proceeds from sale of equity securities |  |  |  |  |  |  |  |  | 3,112 | 2,829 | 0
Venture capital and other investments |  |  |  |  |  |  |  |  | 116 | 399 | 150
Net cash used in investing activities |  |  |  |  |  |  |  |  | 5,627 | 3,228 | 149
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (7,644) | (81,065) | (21,633)
Cash dividends |  |  |  |  |  |  |  |  | (98,688) | (99,131) | (83,428)
Proceeds from shares issued under the Dividend Reinvestment Plan |  |  |  |  |  |  |  |  | 9,777 | 3,366 | 2,821
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 0 | 838
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (1,911) | (2,311) | (3,550)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (23,593) | (36,301) | (42,648)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (122,059) | (215,442) | (147,600)
Increase/(decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 12,653 | 17,939 | (27,524)
Cash and cash equivalents, beginning of the year |  |  |  | $ 39,566 |  |  |  | $ 21,627 | 39,566 | 21,627 | 49,151
Cash and cash equivalents, end of the year | $ 52,219 |  |  |  | $ 39,566 |  |  |  | $ 52,219 | $ 39,566 | $ 21,627

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