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Note 19 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2014
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash pledged as margin for interest rate swaps | $ 24,300 | $ 34,700 |  |  |
Equity securities | 22,319 | 23,744 |  |  |
Other assets | 195,403 | 170,889 |  |  |
Total assets | 20,886,723 | 19,043,134 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 |  |  |  | $ 119,100
Other liabilities | 180,543 | 175,502 |  |  |
Total liabilities | 18,440,472 | 16,624,990 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 90,871,860 issued and 75,750,862 outstanding at December 31, 2021, and 90,643,206 issued and 79,508,265 outstanding at December 31, 2020 | 909 | 906 |  |  |
Additional paid-in-capital | 972,474 | 964,734 |  |  |
Accumulated other comprehensive income, net | (3,065) | 5,310 |  |  |
Retained earnings | 1,985,168 | 1,789,325 |  |  |
Treasury stock, at cost (15,120,998 shares at December 31, 2021, and 11,134,941 shares at December 31, 2020) | (509,235) | (342,131) |  |  |
Total equity | 2,446,251 | 2,418,144 | $ 2,294,283 | $ 2,121,866 |
Total liabilities and equity | 20,886,723 | 19,043,134 |  |  |
Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash | 19,629 | 50,060 |  |  |
Cash pledged as margin for interest rate swaps | 1,071 | 2,159 |  |  |
Short-term certificates of deposit | 333 | 332 |  |  |
Equity securities | 15,627 | 15,505 |  |  |
Other assets | 4,691 | 6,447 |  |  |
Total assets | 2,573,008 | 2,542,991 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136 | 119,136 |  |  |
Other liabilities | 7,621 | 5,711 |  |  |
Total liabilities | 126,757 | 124,847 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 90,871,860 issued and 75,750,862 outstanding at December 31, 2021, and 90,643,206 issued and 79,508,265 outstanding at December 31, 2020 | 909 | 906 |  |  |
Additional paid-in-capital | 972,474 | 964,734 |  |  |
Accumulated other comprehensive income, net | (3,065) | 5,310 |  |  |
Retained earnings | 1,985,168 | 1,789,325 |  |  |
Treasury stock, at cost (15,120,998 shares at December 31, 2021, and 11,134,941 shares at December 31, 2020) | (509,235) | (342,131) |  |  |
Total equity | 2,446,251 | 2,418,144 |  |  |
Total liabilities and equity | 2,573,008 | 2,542,991 |  |  |
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | 2,530,850 | 2,467,643 |  |  |
Non Bank Subsidiaries [Member] | Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in subsidiaries | $ 807 | $ 845 |  |  |

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