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Note 20 - Condensed Financial Information of Cathay General Bancorp - Statements of Cash Flows (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
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 64,648 | $ 69,757 | $ 73,664 | $ 63,816 | $ 279,135 | $ 271,885 | $ 176,042
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 39,898 | 40,871 | 4,572
Net change in other assets |  |  |  |  |  |  |  |  | 6,163 | (13,984) | 25,747
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | (340) | (5,628)
Net change in other liabilities |  |  |  |  |  |  |  |  | 21,061 | 13,848 | (2,641)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 434,979 | 336,538 | 248,874
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (770,206) | (497,787) | (607,574)
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | 0 | 0 | (1,392)
Net cash provided by/(used in) investment activities |  |  |  |  |  |  |  |  | (1,381,674) | (1,134,327) | (903,987)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (81,065) | (23,040) | 0
Cash dividends |  |  |  |  |  |  |  |  | (99,131) | (83,428) | (69,888)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 838 | 1,094
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (2,311) | (3,550) | (5,128)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (36,301) | (42,648) | 0
Net cash (used in)/provided by financing activities |  |  |  |  |  |  |  |  | 940,183 | 863,278 | 4,830
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 279,135 | 271,885 | 176,042
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (44,860) | (154,227) | 88,247
(Gain)/loss on equity securities |  |  |  |  |  |  |  |  | (4,414) | 2,242 | 0
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 105 | 271 | 254
Loss/(gain) in fair value of warrants |  |  |  |  |  |  |  |  | 145 | (93) | (12)
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 749 | 649 | 550
Net change in other assets |  |  |  |  |  |  |  |  | 125 | 915 | 3,490
Gain from acquisition |  |  |  |  |  |  |  |  | 0 | (340) | (5,628)
Net change in other liabilities |  |  |  |  |  |  |  |  | (832) | (1,375) | 5,949
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 230,153 | 119,927 | 268,892
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
(Increase)/decrease in short-term investment |  |  |  |  |  |  |  |  | 0 | (1) | (2)
Proceeds from sale of equity securities |  |  |  |  |  |  |  |  | 2,829 | 0 | 12,580
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | 0 | 0 | (2,759)
Venture capital and other investments |  |  |  |  |  |  |  |  | 399 | 150 | 671
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | 0 | 0 | (275,328)
Net cash provided by/(used in) investment activities |  |  |  |  |  |  |  |  | 3,228 | 149 | (264,838)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (81,065) | (21,633) | 0
Proceeds of issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 75,000
Cash dividends |  |  |  |  |  |  |  |  | (99,131) | (83,428) | (69,888)
Proceeds from shares issued under the Dividend Reinvestment Plan |  |  |  |  |  |  |  |  | 3,366 | 2,821 | 2,528
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 838 | 1,094
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (2,311) | (3,550) | (5,128)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (36,301) | (42,648) | 0
Net cash (used in)/provided by financing activities |  |  |  |  |  |  |  |  | (215,442) | (147,600) | 3,606
(Decrease)/Increase in cash and cash equivalents |  |  |  |  |  |  |  |  | 17,939 | (27,524) | 7,660
Cash and cash equivalents, beginning of the year |  |  |  | $ 21,627 |  |  |  | $ 49,151 | 21,627 | 49,151 | 41,491
Cash and cash equivalents, end of the year | $ 39,566 |  |  |  | $ 21,627 |  |  |  | $ 39,566 | $ 21,627 | $ 49,151

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