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Disclosure - Note 5 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-5-loans-average-balance-and-interest-income-recognized-related-to-nonaccrual-loans-details Note 5 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) Details 46 false false R47.htm 995491 - Disclosure - Note 5 - Loans - Aging of Loan Portfolio (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-5-loans-aging-of-loan-portfolio-details Note 5 - Loans - Aging of Loan Portfolio (Details) Details 47 false false R48.htm 995492 - Disclosure - Note 5 - Loans - Amortized Cost of Modified Loans (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-5-loans-amortized-cost-of-modified-loans-details Note 5 - Loans - Amortized Cost of Modified Loans (Details) Details 48 false false R49.htm 995493 - Disclosure - Note 5 - 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Disclosure - Note 6 - Equity Securities (Details Textual) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-6-equity-securities-details-textual Note 6 - Equity Securities (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-6-equity-securities 52 false false R53.htm 995497 - Disclosure - Note 7 - Goodwill and Other Intangible Assets (Details Textual) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-7-goodwill-and-other-intangible-assets-details-textual Note 7 - Goodwill and Other Intangible Assets (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-7-goodwill-and-other-intangible-assets-tables 53 false false R54.htm 995498 - Disclosure - Note 7 - Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-7-goodwill-and-other-intangible-assets-schedule-of-intangible-assets-details Note 7 - 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Commitments and Contingencies (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-9-commitments-and-contingencies 57 false false R58.htm 995502 - Disclosure - Note 10 - Stockholders' Equity (Details Textual) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-10-stockholders-equity-details-textual Note 10 - Stockholders' Equity (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-10-stockholders-equity-tables 58 false false R59.htm 995503 - Disclosure - Note 10 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-10-stockholders-equity-accumulated-other-comprehensive-income-details Note 10 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) Details 59 false false R60.htm 995504 - Disclosure - Note 11 - Earnings Per Share - Earnings Per Share (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-11-earnings-per-share-earnings-per-share-details Note 11 - 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Disclosure - Note 14 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-details-textual Note 14 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-tables 64 false false R65.htm 995509 - Disclosure - Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-assets-and-liabilities-measured-at-fair-value-on-a-recurring-basis-details Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Details 65 false false R66.htm 995510 - Disclosure - Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets Measured on a Non-recurring Basis (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-financial-assets-measured-on-a-nonrecurring-basis-details Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets Measured on a Non-recurring Basis (Details) Details 66 false false R67.htm 995511 - Disclosure - Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-fair-value-of-financial-instruments-details Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) Details 67 false false R68.htm 995512 - Disclosure - Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-14-fair-value-measurements-and-fair-value-of-financial-instruments-fair-value-hierarchy-of-financial-instruments-details Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) Details 68 false false R69.htm 995513 - Disclosure - Note 15 - Financial Derivatives (Details Textual) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-15-financial-derivatives-details-textual Note 15 - Financial Derivatives (Details Textual) Details http://www.cathaygeneralbancorp.com/20260630/role/statement-note-15-financial-derivatives-tables 69 false false R70.htm 995514 - Disclosure - Note 15 - Financial Derivatives - Not Designated as Hedging (Details) Sheet http://www.cathaygeneralbancorp.com/20260630/role/statement-note-15-financial-derivatives-not-designated-as-hedging-details Note 15 - 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