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Note 10 - Capital Resources (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 | Feb. 29, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 01, 2016 | Dec. 31, 2014
Stockholders' Equity Attributable to Parent |  |  | $ 1,973,304 |  |  |  | $ 1,828,539 |  |  |  | $ 1,973,304 | $ 1,828,539 | $ 1,747,778 |  | $ 1,602,888
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | $ 144,800 |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  |  | 7.90% |  |  |  |
Net Income (Loss) Attributable to Parent |  |  | $ 25,940 | $ 49,746 | $ 51,415 | $ 48,941 | $ 48,015 | $ 46,090 | $ 34,831 | $ 46,163 | $ 176,042 | 175,099 | 161,109 |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  | 2,528 | 2,277 | 4,175 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  | 1,094 | 7,661 | 5,014 |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | 1,204 | 4,711 | (2,857) |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  | 6,813 | 103 | 227 |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  | $ 69,888 | $ 59,274 | 45,283 |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  |  |  |  |  |  | $ 0.87 | $ 0.75 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  | $ 54,441 | 59,412 |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  |  |  |  |  |  |  | $ 4,100 | $ 3,500 | $ 3,000 |  |
November 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 622,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 18,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 29.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
August 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 633,250 |  |  |  |  |  |  |  |  |  |  | 1,366,750 |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 26.82 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
February 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  | 1,380,578 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  | $ 37,500 |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  |  | $ 27.13 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  | 7,500,000 |  |  |  |  |  |  |  | 7,500,000 |  |  |  |
U.S. Treasury [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 943,327 |  |  |  | 943,345 |  |  |  | 943,327 | 943,345 | 1,846,374 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 20.41 |  |  |  |  |  |  |  | $ 20.41 |  | $ 20.96 |  |
Class of Warrant or Right, Increase in Warrants Exercisable, Percentage |  |  |  |  |  |  |  |  |  |  | 1.03% |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  | $ 6,800 |  |  |  |
SinoPac Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | $ 34,900 |  |  |  |  |  |  |  | $ 34,900 |  |  |  |

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