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Note 20 - Condensed Financial Information of Cathay General Bancorp (Details) - Statements of Operations (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 106,043 us-gaap_InterestIncomeOperating | $ 106,335 us-gaap_InterestIncomeOperating | $ 105,062 us-gaap_InterestIncomeOperating | $ 101,207 us-gaap_InterestIncomeOperating | $ 101,621 us-gaap_InterestIncomeOperating | $ 102,462 us-gaap_InterestIncomeOperating | $ 100,862 us-gaap_InterestIncomeOperating | $ 102,051 us-gaap_InterestIncomeOperating |  |  |
Interest expense | 18,292 us-gaap_InterestExpense | 19,580 us-gaap_InterestExpense | 19,445 us-gaap_InterestExpense | 18,549 us-gaap_InterestExpense | 19,659 us-gaap_InterestExpense | 19,854 us-gaap_InterestExpense | 20,868 us-gaap_InterestExpense | 21,919 us-gaap_InterestExpense | 75,866 us-gaap_InterestExpense | 82,300 us-gaap_InterestExpense | 108,491 us-gaap_InterestExpense
Non-interest income | 7,973 us-gaap_NoninterestIncome | 8,974 us-gaap_NoninterestIncome | 9,021 us-gaap_NoninterestIncome | 14,559 us-gaap_NoninterestIncome | 8,345 us-gaap_NoninterestIncome | 16,720 us-gaap_NoninterestIncome | 20,361 us-gaap_NoninterestIncome | 14,881 us-gaap_NoninterestIncome | 40,527 us-gaap_NoninterestIncome | 60,307 us-gaap_NoninterestIncome | 46,507 us-gaap_NoninterestIncome
Non-interest expense | 41,125 us-gaap_NoninterestExpense | 42,607 us-gaap_NoninterestExpense | 42,513 us-gaap_NoninterestExpense | 48,068 us-gaap_NoninterestExpense | 40,319 us-gaap_NoninterestExpense | 50,670 us-gaap_NoninterestExpense | 53,716 us-gaap_NoninterestExpense | 49,128 us-gaap_NoninterestExpense | 174,313 us-gaap_NoninterestExpense | 193,833 us-gaap_NoninterestExpense | 192,589 us-gaap_NoninterestExpense
Income tax benefit | 21,021 us-gaap_IncomeTaxExpenseBenefit | 22,313 us-gaap_IncomeTaxExpenseBenefit | 20,741 us-gaap_IncomeTaxExpenseBenefit | 17,890 us-gaap_IncomeTaxExpenseBenefit | 17,946 us-gaap_IncomeTaxExpenseBenefit | 19,029 us-gaap_IncomeTaxExpenseBenefit | 16,573 us-gaap_IncomeTaxExpenseBenefit | 16,887 us-gaap_IncomeTaxExpenseBenefit | 81,965 us-gaap_IncomeTaxExpenseBenefit | 70,435 us-gaap_IncomeTaxExpenseBenefit | 66,128 us-gaap_IncomeTaxExpenseBenefit
Income before undistributed earnings of subsidiaries | 56,599 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 58,222 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 55,825 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 49,149 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 49,988 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 51,658 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 46,639 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 45,885 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 219,795 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 194,170 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 184,171 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | 35,578 us-gaap_NetIncomeLoss | 35,909 us-gaap_NetIncomeLoss | 35,084 us-gaap_NetIncomeLoss | 31,259 us-gaap_NetIncomeLoss | 32,042 us-gaap_NetIncomeLoss | 32,629 us-gaap_NetIncomeLoss | 30,066 us-gaap_NetIncomeLoss | 28,998 us-gaap_NetIncomeLoss | 137,830 us-gaap_NetIncomeLoss | 123,143 us-gaap_NetIncomeLoss | 117,438 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends from Cathay Bank |  |  |  |  |  |  |  |  | 30,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 138,030 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 154,700 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income |  |  |  |  |  |  |  |  | 88 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 157 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 196 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 4,469 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,994 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,228 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Non-interest income |  |  |  |  |  |  |  |  | 10,144 us-gaap_NoninterestIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 434 us-gaap_NoninterestIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,718 us-gaap_NoninterestIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Non-interest expense |  |  |  |  |  |  |  |  | 2,248 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,443 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,064 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax benefit |  |  |  |  |  |  |  |  | 33,515 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 133,184 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 153,322 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit |  |  |  |  |  |  |  |  | 1,478 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,037)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (579)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 32,037 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 135,221 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 153,901 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Distributions more than earnings of subsidiaries |  |  |  |  |  |  |  |  |  | (12,078)caty_DistributionsInExcessOfEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (36,463)caty_DistributionsInExcessOfEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 105,793 caty_UndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net income |  |  |  |  |  |  |  |  | $ 137,830 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 123,143 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 117,438 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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