Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans, allowance for loan losses	$ 616,063	$ 570,842
Common stock, par value (in dollars per share)	$ 2.00	$ 2.00
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	11,083,997	10,993,404
Common stock, shares outstanding (in shares)	11,083,997	10,993,404
Net unrealized losses on available-for-sale securities, income taxes	$ 557	$ 2,536