Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available-for-sale, amortized cost	$ 1,783,915	$ 1,726,080
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)	91,411,744	91,392,480
Common stock, shares outstanding (in shares)	72,688,191	72,668,927
Treasury stock, shares (in shares)	18,723,553	18,723,553