Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Securities available for sale, at amortized cost	$ 366,492	$ 365,936
Securities held to maturity, at fair value	$ 26,596	$ 27,178
Common stock, par value	$ 1.25	$ 1.25
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	7,075,125	7,075,125
Common stock, shares outstanding	7,075,125	7,075,125