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Note 10 - Capital Resources (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 | Feb. 29, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 01, 2016 | Dec. 31, 2013
Stockholders' Equity Attributable to Parent |  |  | $ 1,828,539,000 |  |  |  | $ 1,747,778,000 |  |  |  | $ 1,828,539,000 | $ 1,747,778,000 | $ 1,602,888,000 |  | $ 1,458,971,000
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | $ 80,800,000 |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |  |
Net Income (Loss) Attributable to Parent |  |  | $ 48,015,000 | $ 46,090,000 | $ 34,831,000 | $ 46,163,000 | $ 41,446,000 | $ 38,483,000 | $ 45,200,000 | $ 35,980,000 | $ 175,099,000 | 161,109,000 | 137,830,000 |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | 4,711,000 | (2,857,000) | 24,160,000 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  | 7,661,000 | 5,014,000 | 128,000 |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  | 2,277,000 | 4,175,000 | 2,848,000 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | 54,441,000 | 59,412,000 |  |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  | $ 59,274,000 | $ 45,283,000 | 23,105,000 |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  |  |  |  |  |  | $ 0.75 | $ 0.56 |  |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  |  |  |  |  |  |  | $ 3,500,000 | $ 3,000,000 | $ 2,900,000 |  |
U.S. Treasury [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 943,345 |  |  |  | 1,846,374 |  |  |  | 943,345 | 1,846,374 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 20.65 |  |  |  | $ 20.96 |  |  |  | $ 20.65 | $ 20.96 |  |  |
Class of Warrant or Right, Increase in Warrants Exercisable, Percentage |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Number of Warrants Exercised |  |  |  |  |  |  |  |  |  |  | 930,113 |  |  |  |
Stock Issued During the Period, Warrants Exercised |  |  |  |  |  |  |  |  |  |  | 388,001 |  |  |  |
November 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 18,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 622,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 29.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
August 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 633,250 |  |  |  |  |  |  |  |  |  | 1,366,750 |  |  |
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, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | $ 37,500,000 |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  | 1,380,578 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 27.13 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  | 7,500,000 |  |  |  |  |  |  |  | 7,500,000 |  |  |  |

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