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Note 20 - Condensed Financial Information of Cathay General Bancorp - Statements of Cash Flows (Details) - USD ($) | 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
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 64,648,000 | $ 69,757,000 | $ 73,664,000 | $ 63,816,000 | $ 25,940,000 | $ 49,746,000 | $ 51,415,000 | $ 48,941,000 | $ 271,885,000 | $ 176,042,000 | $ 175,099,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 40,871,000 | 4,572,000 | 28,897,000
Write-down on impaired securities |  |  |  |  |  |  |  |  |  |  | 206,000
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 7,974,000 | 5,734,000 | 4,963,000
Net change in other assets |  |  |  |  |  |  |  |  | (13,984,000) | 25,747,000 | 13,478,000
Gain from acquisition |  |  |  |  |  |  |  |  | (340,000) | (5,628,000) |
Net change in other liabilities |  |  |  |  |  |  |  |  | 13,848,000 | (2,641,000) | (2,784,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 336,538,000 | 248,874,000 | 234,402,000
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investment securities available-for-sale |  |  |  |  |  |  |  |  | 99,899,000 | 111,704,000 | 294,000
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (497,787,000) | (339,814,000) | (941,327,000)
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  | (1,392,000) |
Net cash provided by/(used in) investment activities |  |  |  |  |  |  |  |  | (1,134,327,000) | (903,987,000) | (853,492,000)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (23,040,000) |  |
Proceeds from issuance of long-term debt and other borrowings |  |  |  |  |  |  |  |  |  | 75,000,000 |
Cash dividends |  |  |  |  |  |  |  |  | (83,428,000) | (69,888,000) | (59,274,000)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 838,000 | 1,094,000 | 7,661,000
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (3,550,000) | (5,128,000) | (103,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (42,648,000) |  | (54,441,000)
Net cash (used in)/provided by financing activities |  |  |  |  |  |  |  |  | 863,278,000 | 4,830,000 | 1,087,164,000
(Decrease)/Increase in cash and cash equivalents |  |  |  |  |  |  |  |  | 65,489,000 | (650,283,000) | 468,074,000
Cash and cash equivalents, beginning of the year |  |  |  | 534,801,000 |  |  |  | 1,185,084,000 | 534,801,000 | 1,185,084,000 | 717,010,000
Cash and cash equivalents, end of the year | 600,290,000 |  |  |  | 534,801,000 |  |  |  | 600,290,000 | 534,801,000 | 1,185,084,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 271,885,000 | 176,042,000 | 175,099,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (154,227,000) | 88,247,000 | (67,770,000)
Dividends in excess of earnings of non-bank subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,281,000
Unrealized loss on equity securities |  |  |  |  |  |  |  |  | 2,242,000 |  |
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 271,000 | 254,000 | 503,000
Write-down on impaired securities |  |  |  |  |  |  |  |  |  |  | 206,000
Loss in fair value of warrants |  |  |  |  |  |  |  |  | (93,000) | (12,000) | (17,000)
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 649,000 | 550,000 | 550,000
Net change in other assets |  |  |  |  |  |  |  |  | 915,000 | 3,490,000 | (1,136,000)
Gain from acquisition |  |  |  |  |  |  |  |  | (340,000) | (5,628,000) |
Net change in other liabilities |  |  |  |  |  |  |  |  | (1,375,000) | 5,949,000 | (756,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 119,927,000 | 268,892,000 | 107,960,000
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
(Increase)/decrease in short-term investment |  |  |  |  |  |  |  |  | (1,000) | (2,000) | 23,999,000
Proceeds from sale of investment securities available-for-sale |  |  |  |  |  |  |  |  |  | 12,580,000 | 294,000
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  |  | (2,759,000) |
Venture capital and other investments |  |  |  |  |  |  |  |  | 150,000 | 671,000 | 134,000
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  | (275,328,000) |
Net cash provided by/(used in) investment activities |  |  |  |  |  |  |  |  | 149,000 | (264,838,000) | 24,427,000
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (21,633,000) |  |
Proceeds from issuance of long-term debt and other borrowings |  |  |  |  |  |  |  |  |  | 75,000,000 |
Cash dividends |  |  |  |  |  |  |  |  | (83,428,000) | (69,888,000) | (59,274,000)
Proceeds from shares issued under the Dividend Reinvestment Plan |  |  |  |  |  |  |  |  | 2,821,000 | 2,528,000 | 2,277,000
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 838,000 | 1,094,000 | 7,661,000
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (3,550,000) | (5,128,000) | (103,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (42,648,000) |  | (54,441,000)
Net cash (used in)/provided by financing activities |  |  |  |  |  |  |  |  | (147,600,000) | 3,606,000 | (103,880,000)
(Decrease)/Increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (27,524,000) | 7,660,000 | 28,507,000
Cash and cash equivalents, beginning of the year |  |  |  | $ 49,151,000 |  |  |  | $ 41,491,000 | 49,151,000 | 41,491,000 | 12,984,000
Cash and cash equivalents, end of the year | $ 21,627,000 |  |  |  | $ 49,151,000 |  |  |  | $ 21,627,000 | $ 49,151,000 | $ 41,491,000

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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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