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Note 21 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 31, 2014
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Equity securities | $ 40,406 | $ 22,158 |  |  |
Other assets | 267,762 | 250,069 |  |  |
Total assets | 23,081,534 | 21,947,976 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 | 119,136 |  |  | $ 119,100
Other liabilities | 306,528 | 307,031 |  |  |
Total liabilities | 20,344,959 | 19,473,936 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 91,392,480 issued and 72,668,927 outstanding at December 31, 2023, and 91,090,614 issued and 72,742,151 outstanding at December 31, 2022 | 914 | 911 |  |  |
Additional paid-in-capital | 987,953 | 981,119 |  |  |
Accumulated other comprehensive income loss, net | (85,416) | (102,295) |  |  |
Retained earnings | 2,500,341 | 2,244,855 |  |  |
Total equity | 2,736,575 | 2,474,040 | $ 2,446,251 | $ 2,418,144 |
Total liabilities and equity | 23,081,534 | 21,947,976 |  |  |
Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash | 24,262 | 14,902 |  |  |
Short-term certificates of deposit | 335 | 334 |  |  |
Equity securities | 34,441 | 16,360 |  |  |
Other assets | 3,896 | 4,385 |  |  |
Total assets | 2,869,469 | 2,603,011 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 | 119,136 |  |  |
Other liabilities | 13,758 | 9,835 |  |  |
Total liabilities | 132,894 | 128,971 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 91,392,480 issued and 72,668,927 outstanding at December 31, 2023, and 91,090,614 issued and 72,742,151 outstanding at December 31, 2022 | 914 | 911 |  |  |
Additional paid-in-capital | 987,953 | 981,119 |  |  |
Accumulated other comprehensive income loss, net | (85,416) | (102,295) |  |  |
Retained earnings | 2,500,341 | 2,244,855 |  |  |
Treasury stock, at cost (18,723,553 shares at December 31, 2023, and 18,348,463 shares at December 31, 2022) | (667,217) | (650,550) |  |  |
Total equity | 2,736,575 | 2,474,040 |  |  |
Total liabilities and equity | 2,869,469 | 2,603,011 |  |  |
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | 2,806,467 | 2,566,266 |  |  |
Parent Company [Member] | Non Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | $ 68 | $ 764 |  |  |

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