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Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Interest and loan fee income $ 154,396 $ 183,364 $ 207,979
Net interest income 149,725 177,620 199,597
Provision for credit losses 8,000 11,200 11,200
Noninterest income 57,011 57,022 60,097
Noninterest expense 112,614 116,885 127,678
Income before taxes 86,122 106,557 120,816
Net income 67,177 81,127 87,888
Basic earnings per share (in Dollars per share) $ 2.50 $ 2.93 $ 3.07
Diluted earnings per share (in Dollars per share) $ 2.50 $ 2.93 $ 3.06
Dividends paid per share (in Dollars per share) $ 1.49 $ 1.48 $ 1.45
Price range, common stock (in Dollars per share) $ 56.46    
Quarter Ending March 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Interest and loan fee income 40,465 48,298 52,494
Net interest income 39,213 46,739 50,191
Provision for credit losses 2,800 2,800 2,800
Noninterest income 14,278 14,669 14,743
Noninterest expense 28,677 30,034 31,323
Income before taxes 22,014 28,574 30,811
Net income 17,271 21,005 22,382
Basic earnings per share (in Dollars per share) $ 0.64 $ 0.75 $ 0.77
Diluted earnings per share (in Dollars per share) $ 0.64 $ 0.75 $ 0.77
Dividends paid per share (in Dollars per share) $ 0.37 $ 0.37 $ 0.36
Quarter Ending June 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Interest and loan fee income 39,269 46,901 53,088
Net interest income 38,050 45,429 50,935
Provision for credit losses 1,800 2,800 2,800
Noninterest income 14,284 13,533 15,292
Noninterest expense 28,192 29,349 34,309
Income before taxes 22,342 26,813 29,118
Net income 17,112 20,964 21,269
Basic earnings per share (in Dollars per share) $ 0.64 $ 0.76 $ 0.74
Diluted earnings per share (in Dollars per share) $ 0.64 $ 0.75 $ 0.74
Dividends paid per share (in Dollars per share) $ 0.37 $ 0.37 $ 0.36
Quarter Ending September 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Interest and loan fee income 37,956 45,272 51,976
Net interest income 36,780 43,890 49,905
Provision for credit losses 1,800 2,800 2,800
Noninterest income 14,419 14,626 15,205
Noninterest expense 27,758 29,269 31,383
Income before taxes 21,641 26,447 30,927
Net income 16,738 20,022 22,432
Basic earnings per share (in Dollars per share) $ 0.63 $ 0.73 $ 0.79
Diluted earnings per share (in Dollars per share) $ 0.63 $ 0.73 $ 0.79
Dividends paid per share (in Dollars per share) $ 0.37 $ 0.37 $ 0.36
Quarter Ending December 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Interest and loan fee income 36,706 42,893 50,421
Net interest income 35,682 41,562 48,566
Provision for credit losses 1,600 2,800 2,800
Noninterest income 14,030 14,194 14,857
Noninterest expense 27,987 28,233 30,663
Income before taxes 20,125 24,723 29,960
Net income $ 16,056 $ 19,136 $ 21,805
Basic earnings per share (in Dollars per share) $ 0.60 $ 0.70 $ 0.77
Diluted earnings per share (in Dollars per share) $ 0.60 $ 0.70 $ 0.77
Dividends paid per share (in Dollars per share) $ 0.38 $ 0.37 $ 0.37
Minimum [Member] | Quarter Ending March 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 42.59 $ 43.90 $ 49.25
Minimum [Member] | Quarter Ending June 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 41.76 $ 43.01 $ 46.91
Minimum [Member] | Quarter Ending September 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 45.73 $ 44.08 $ 36.32
Minimum [Member] | Quarter Ending December 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 48.29 $ 40.50 $ 36.34
Maximum [Member] | Quarter Ending March 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 45.80 $ 49.53 $ 56.96
Maximum [Member] | Quarter Ending June 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 46.56 $ 48.62 $ 52.53
Maximum [Member] | Quarter Ending September 30 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 50.78 $ 49.39 $ 50.52
Maximum [Member] | Quarter Ending December 31 [Member]
      
Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information [Line Items]      
Price range, common stock (in Dollars per share) $ 57.59 $ 47.72 $ 46.73