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Note 3 - Investment Securities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities Continuous Unrealized Loss Position, Fair Value $ 1,200,000,000 $ 872,400,000  
Securities Continuous Unrealized Loss Position Fair Value Percent of Portfolio 75.70% 57.10%  
Available-for-sale Securities Pledged as Collateral $ 915,200,000 $ 840,400,000  
Securities Sold under Agreements to Repurchase 102,400,000 96,800,000  
Available-for-sale Securities, Gross Realized Gains 5,800,000 350,000 $ 199,000
Available-for-sale Securities, Gross Realized Losses $ 0 $ 43,000 $ 191,000
Income Tax Benefit Related to Security Gains (Losses) Percentage 39.225%