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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Securities held-to-maturity, fair value $ 194,886 $ 141,575
Common stock, par value $ 5 $ 5
Common stock, shares authorized 48,000,000 48,000,000
Common stock, shares issued 31,556,799 31,556,799
Common stock, shares outstanding 29,334,629 29,270,852
Treasury stock, shares 2,222,170 2,285,947