Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities available-for-sale, amortized cost	$ 1,230,785	$ 1,317,012
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	88,022,322	87,820,920
Common stock, shares outstanding (in shares)	79,811,679	79,610,277
Treasury stock shares (in shares)	8,210,643	8,210,643