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Note 19 - Condensed Financial Information of Cathay General Bancorp - Statements of Cash Flows (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 48,015,000 | $ 46,090,000 | $ 34,831,000 | $ 46,163,000 | $ 41,446,000 | $ 38,483,000 | $ 45,200,000 | $ 35,980,000 | $ 175,099,000 | $ 161,109,000 | $ 137,830,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Income associated with debt redemption |  |  |  |  |  |  |  |  |  |  | (555,000)
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 28,897,000 | 25,058,000 | 436,000
Write-down on impaired securities |  |  |  |  |  |  |  |  | 206,000 | 3,875,000 | 820,000
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 4,963,000 | 4,950,000 | 4,190,000
Net change in other assets |  |  |  |  |  |  |  |  | 13,478,000 | (3,429,000) | (2,776,000)
Net change in other liabilities |  |  |  |  |  |  |  |  | (2,784,000) | (15,506,000) | (11,256,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 234,402,000 | 176,697,000 | 150,071,000
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investment securities available-for-sale |  |  |  |  |  |  |  |  | 294,000 | 385,234,000 | 160,451,000
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (941,327,000) | (295,497,000) | (885,782,000)
Acquisition, net of cash acquired |  |  |  |  |  |  |  |  |  | 6,572,000 |
Net cash (used in)/provided by investment activities |  |  |  |  |  |  |  |  | (1,283,679,000) | (1,177,571,000) | (459,361,000)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  | (59,274,000) | (45,283,000) | (23,104,000)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 7,661,000 | 5,014,000 | 128,000
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (103,000) | (227,000) | (850,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (54,441,000) | (59,412,000) |
Net cash used in financing activities |  |  |  |  |  |  |  |  | 1,087,164,000 | 1,004,174,000 | 332,373,000
Increase/(Decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 37,887,000 | 3,300,000 | 23,083,000
Cash and cash equivalents, beginning of the year |  |  |  | 180,130,000 |  |  |  | 176,830,000 | 180,130,000 | 176,830,000 | 153,747,000
Cash and cash equivalents, end of the year | 218,017,000 |  |  |  | 180,130,000 |  |  |  | 218,017,000 | 180,130,000 | 176,830,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 175,099,000 | 161,109,000 | 137,830,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (66,489,000) | (4,884,000) | (105,793,000)
Dividends in excess of earnings of non-bank subsidiaries |  |  |  |  |  |  |  |  | 1,281,000 |  |
Gains on sale of securities |  |  |  |  |  |  |  |  |  |  | (10,689,000)
Income associated with debt redemption |  |  |  |  |  |  |  |  |  |  | (555,000)
Write-downs on venture capital and other investments |  |  |  |  |  |  |  |  | 503,000 | 468,000 | 432,000
Write-down on impaired securities |  |  |  |  |  |  |  |  | 206,000 |  | 264,000
Loss in fair value of warrants |  |  |  |  |  |  |  |  | (17,000) |  | 3,000
Stock issued to directors as compensation |  |  |  |  |  |  |  |  | 550,000 | 495,000 | 350,000
Excess tax short-fall from stock options |  |  |  |  |  |  |  |  |  | 5,348,000 | 1,285,000
Net change in other assets |  |  |  |  |  |  |  |  | (1,136,000) | 619,000 | (3,445,000)
Net change in other liabilities |  |  |  |  |  |  |  |  | (756,000) | (5,438,000) | (1,294,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 107,960,000 | 157,717,000 | 18,388,000
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
(Increase)/decrease in short-term investment |  |  |  |  |  |  |  |  | 23,999,000 | (1,121,000) | 14,797,000
Proceeds from sale of investment securities available-for-sale |  |  |  |  |  |  |  |  | 294,000 |  | 12,083,000
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  |  | (410,000) | (7,920,000)
Venture capital and other investments |  |  |  |  |  |  |  |  | 134,000 |  | (590,000)
Acquisition, net of cash acquired |  |  |  |  |  |  |  |  |  | (57,006,000) |
Net cash (used in)/provided by investment activities |  |  |  |  |  |  |  |  | 24,427,000 | (58,537,000) | 18,370,000
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  | (1,445,000)
Cash dividends |  |  |  |  |  |  |  |  | (59,274,000) | (45,283,000) | (23,104,000)
Proceeds from shares issued under the Dividend Reinvestment Plan |  |  |  |  |  |  |  |  | 2,277,000 | 4,175,000 | 2,848,000
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 7,661,000 | 5,014,000 | 128,000
Taxes paid related to net share settlement of RSUs |  |  |  |  |  |  |  |  | (103,000) | (227,000) | (850,000)
Excess tax short-fall from share-based payment arrangements |  |  |  |  |  |  |  |  |  | (5,348,000) | (1,285,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (54,441,000) | (59,412,000) |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (103,880,000) | (101,081,000) | (23,708,000)
Increase/(Decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 28,507,000 | (1,901,000) | 13,050,000
Cash and cash equivalents, beginning of the year |  |  |  | $ 12,984,000 |  |  |  | $ 14,885,000 | 12,984,000 | 14,885,000 | 1,835,000
Cash and cash equivalents, end of the year | $ 41,491,000 |  |  |  | $ 12,984,000 |  |  |  | $ 41,491,000 | $ 12,984,000 | $ 14,885,000

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- Definition The sum of the periodic adjustments of the differences between investments' face values and purchase prices that are charged against earnings. This is called accretion if the investment was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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