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CONSOLIDATED STATEMENTS OF CONDITION (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Statement of Financial Position [Abstract]      
Securities held to maturity, fair value $ 32,767 $ 44,549 $ 47,373
Allowance for loan losses $ 13,414 $ 13,976 $ 14,105
Preferred stock, par value (in dollars per share) $ 2.50 $ 2.50 $ 2.50
Preferred stock, shares authorized 20,000,000 20,000,000 20,000,000
Preferred stock, shares outstanding 0 0 0
Common stock, par value (in dollars per share) $ 2.50 $ 2.50 $ 2.50
Common stock, shares authorized 20,000,000 20,000,000 20,000,000
Common stock, shares issued 7,104,824 7,086,258 7,082,245
Common stock, shares outstanding 7,042,224 7,023,658 7,019,645
Treasury stock, shares 62,600 62,600 62,600