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Note 20 - Condensed Financial Information of Cathay General Bancorp (Detail) - Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from Operating Activities |  |  |
Net income/(loss) | $ 117,438 | $ 100,150 | $ 11,565
Write-downs on venture capital and other investments | 309 | 379 | 515
Write-downs on impaired securities | 181 | 200 | 492
Excess tax short-fall from stock options | 620 | 290 | 539
(Decrease)/increase in other assets | 37,093 | (534) | 34,594
Increase/(decrease) in other liabilities | (2,256) | 3,746 | (13,368)
Net cash used in operating activities | 164,576 | 174,050 | 168,505
Cash flows from Investment Activities |  |  |
Proceeds from sale/(purchase) of available-for-sale securities | (517,513) | (571,093) | (3,366,780)
Net cash provided by/(used in) investment activities | (46,536) | 127,050 | 596,595
Cash flows from Financing Activities |  |  |
Issuance of common stock |  |  | 124,928
Proceeds from exercise of stock options | 764 | 1,306 |
Excess tax short-fall from share-based payment arrangements | (620) | (290) | (539)
Net cash (used in)/provided by financing activities | (91,019) | (270,559) | (777,877)
Increase in cash and cash equivalents | 27,021 | 30,541 | (12,777)
Cash and cash equivalents, | 144,909 | 117,888 | 87,347
Parent Company [Member] | Beginning of Period [Member] |  |  |
Cash flows from Financing Activities |  |  |
Cash and cash equivalents, | 809 | 787 | 448
Parent Company [Member] | End of Period [Member] |  |  |
Cash flows from Financing Activities |  |  |
Cash and cash equivalents, | 639 | 809 | 787
Parent Company [Member] |  |  |
Cash flows from Operating Activities |  |  |
Net income/(loss) | 117,438 | 100,150 | 11,565
Dividends in excess of earnings of subsidiaries | 36,463 |  |
Equity in undistributed earnings of subsidiaries | 36,463 | (102,492) | (14,427)
Gains on sale of securities | (3,380) |  |
Increase in accrued expense | 12 | 24 | 3
Write-downs on venture capital and other investments | 262 | 321 | 521
Write-downs on impaired securities | 181 | 200 | 492
Loss/(gains) in fair value of warrants | 114 | (215) | 29
Excess tax short-fall from stock options | 620 | 290 | 539
(Decrease)/increase in other assets | 1,820 | (121) | 1,040
Increase/(decrease) in other liabilities | 59 | (221) | (607)
Net cash used in operating activities | 153,589 | (2,064) | (845)
Cash flows from Investment Activities |  |  |
Additional investment in subsidiary |  |  | (94,000)
Decrease/(increase) in short-term investment | (142,300) | 17,500 | (12,000)
Proceeds from sale/(purchase) of available-for-sale securities | 4,849 |  | (418)
Venture capital investments | (694) | (671) | (1,056)
Net cash provided by/(used in) investment activities | (138,145) | 16,829 | (107,474)
Cash flows from Financing Activities |  |  |
Cash dividends | (16,049) | (16,046) | (16,041)
Issuance of common stock |  |  | 124,928
Proceeds from shares issued under the Dividend Reinvestment Plan | 291 | 287 | 310
Proceeds from exercise of stock options | 764 | 1,306 |
Excess tax short-fall from share-based payment arrangements | (620) | (290) | (539)
Net cash (used in)/provided by financing activities | (15,614) | (14,743) | 108,658
Increase in cash and cash equivalents | (170) | 22 | 339
Cash and cash equivalents, | $ 639 | $ 809 |

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6943989&loc=d3e3291-108585 + Details
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