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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Investment securities held-to-maturity, fair value $ 137,476 $ 166,582
Common Stock, Par Value $ 1.00 $ 1.00
Common Stock, Shares Authorized 20,000,000 10,000,000
Common Stock, Shares, Issued 8,480,938 8,459,918
Common Stock, Shares, Outstanding 8,480,938 8,459,918