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Note 17 - Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Note 17 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 1,732,086 |  | $ 1,732,086 |  | $ 1,602,888
Increase (Decrease) in Total Equity |  |  |  | $ 129,200 |  |
Percentage Change in Total Equity |  |  |  | 8.10% |  |
Net Income (Loss) Attributable to Parent |  | $ 38,483 | $ 35,909 | $ 119,663 | $ 102,252 |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | 50,700 |  |
Dividends, Common Stock, Cash |  |  |  | 30,700 |  |
Asia Bancshares [Member] |  |  |  |  |  |
Note 17 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 82,857 |  |  | $ 82,800 |  |
Stock Issued During Period, Shares, Acquisitions (in Shares) | 2,580 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 57,006 |  |  |  |  |

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