Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Loans, allowance for loan losses	$ 7,562	$ 7,902
Common stock, par value	$ 5	$ 5
Common stock, authorized shares	30,000,000	30,000,000
Common stock, outstanding shares	13,261,801	13,201,682
Preferred stock, outstanding shares	0	0