Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Held-to-maturity, fair value	$ 213,051	$ 211,954
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	2,680,625	2,707,576
Treasury stock, at cost	299,977	273,026