Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Securities available-for-sale, amortized cost	$ 1,284,863	$ 1,126,867
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)	90,904,183	90,871,860
Common stock, shares outstanding (in shares)	75,078,258	75,750,862
Treasury stock shares (in shares)	15,825,925	15,120,998