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Note 20 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2014
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash pledged as margin for interest rate swaps | $ 1,800,000 |  |  |  |
Short-term certificates of deposit | 374,957,000 | $ 292,745,000 |  |  |
Securities available for sale | 1,242,509,000 | 1,333,626,000 |  |  |
Other assets | 175,419,000 | 167,491,000 |  |  |
Total assets | 16,784,737,000 | 15,640,186,000 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136,000 |  |  |  | $ 119,100,000
Long-term debt | 189,448,000 | 194,136,000 |  |  |
Deferred payments from acquisition | 18,458,000 | 35,404,000 |  |  |
Other liabilities | 182,618,000 | 186,486,000 |  |  |
Total liabilities | 14,662,871,000 | 13,666,882,000 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 89,826,317 issued and 80,501,948 outstanding at December 31, 2018, and 89,104,022 issued and 80,893,379 outstanding at December 31, 2017 | 898,000 | 891,000 |  |  |
Additional paid-in-capital | 942,062,000 | 932,874,000 |  |  |
Accumulated other comprehensive loss, net | (18,006,000) | (2,511,000) |  |  |
Retained earnings | 1,479,149,000 | 1,281,639,000 |  |  |
Treasury stock, at cost (9,324,369 shares at December 31, 2018, and 8,210,643 shares at December 31, 2017) | 282,237,000 | 239,589,000 |  |  |
Total stockholders' equity | 2,121,866,000 | 1,973,304,000 | $ 1,828,539,000 | $ 1,747,778,000 |
Total liabilities and stockholders' equity | 16,784,737,000 | 15,640,186,000 |  |  |
Parent Company [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash | 19,861,000 | 44,645,000 |  |  |
Cash pledged as margin for interest rate swaps | 1,766,000 | 4,506,000 |  |  |
Short-term certificates of deposit | 328,000 | 327,000 |  |  |
Securities available for sale | 17,564,000 | 19,806,000 |  |  |
Other assets | 6,012,000 | 6,831,000 |  |  |
Total assets | 2,340,256,000 | 2,215,359,000 |  |  |
Liabilities |  |  |  |  |
Junior subordinated debt | 119,136,000 | 119,136,000 |  |  |
Long-term debt | 70,313,000 | 75,000,000 |  |  |
Deferred payments from acquisition | 18,458,000 | 35,404,000 |  |  |
Other liabilities | 10,483,000 | 12,515,000 |  |  |
Total liabilities | 218,390,000 | 242,055,000 |  |  |
Commitments and contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $0.01 par value, 100,000,000 shares authorized, 89,826,317 issued and 80,501,948 outstanding at December 31, 2018, and 89,104,022 issued and 80,893,379 outstanding at December 31, 2017 | 898,000 | 891,000 |  |  |
Additional paid-in-capital | 942,062,000 | 932,874,000 |  |  |
Accumulated other comprehensive loss, net | (18,006,000) | (2,511,000) |  |  |
Retained earnings | 1,479,149,000 | 1,281,639,000 |  |  |
Treasury stock, at cost (9,324,369 shares at December 31, 2018, and 8,210,643 shares at December 31, 2017) | (282,237,000) | (239,589,000) |  |  |
Total stockholders' equity | 2,121,866,000 | 1,973,304,000 |  |  |
Total liabilities and stockholders' equity | 2,340,256,000 | 2,215,359,000 |  |  |
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in Cathay Bank subsidiary | 2,290,073,000 | 2,134,445,000 |  |  |
Investment in subsidiaries | 2,290,073,000 | 2,134,445,000 |  |  |
Parent Company [Member] | Non Bank Subsidiaries [Member] |  |  |  |  |
Assets |  |  |  |  |
Investment in Cathay Bank subsidiary | 4,652,000 | 4,799,000 |  |  |
Investment in subsidiaries | $ 4,652,000 | $ 4,799,000 |  |  |

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