Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Securities held to maturity, at amortized cost, fair value	$ 29,282	$ 29,600
Common stock, par value	$ 1.25	$ 1.25
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	6,964,242	7,052,143
Common stock, shares outstanding	6,964,242	7,052,143