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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Securities available for sale, amortized cost $ 745,328 $ 692,824
Investment securities – held to maturity $ 8,438 $ 7,851
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 24,545,348 24,360,049
Common stock, shares outstanding (in shares) 20,163,816 20,161,395
Treasury stock, shares (in shares) 4,381,532 4,198,654