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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Held-to-maturity, fair value $ 13,950 $ 20,118
Common stock, par value $ 6.25 $ 6.25
Common stock, authorized shares 9,000,000 9,000,000
Common stock, shares issued 2,980,602 2,980,602
Common stock, shares outstanding 2,742,350 2,742,242
Treasury stock, at cost 238,252 238,360