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Note 11 - Capital Resources (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2016 | Feb. 01, 2016 | Jul. 31, 2015 | Aug. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2007 | Nov. 30, 2007
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  |  |  | $ 1,747,778 |  |  |  | $ 1,602,888 |  |  |  | $ 1,747,778 | $ 1,602,888 |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  | $ 144,900 |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  | $ 41,446 | $ 38,483 | $ 45,200 | $ 35,980 | $ 35,578 | $ 35,909 | $ 35,084 | $ 31,259 | $ 161,109 | $ 137,830 | $ 123,143 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  | 59,400 |  |  |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,300 |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.56 | $ 0.29 |  |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 | $ 2,900 | $ 3,000 |  |
November 2007 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 18,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000
Treasury Stock, Shares, Acquired (in Shares) |  |  |  | 622,500 |  |  |  |  |  |  |  |  |  |  |  | 377,500 |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  | $ 29.08 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,300 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in Shares) |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,366,750 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.22 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares) |  |  |  |  | 633,250 |  |  |  |  |  |  |  | 633,250 |  |  |  |
Subsequent Event [Member] | August 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  | 633,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  | $ 26.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | February 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 15,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) | 579,543 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ 27.22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 29,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asia Bancshares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Capital Resources (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | $ 82,900 |  | $ 82,800 |  |  |  |  |  |  |  | $ 82,800 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) |  |  | 2,580,359 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 57,006 |  |  |  |  |  |  |  |  |  | $ 57,006 |  |  |  |

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