Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Investment securities held to maturity, at fair value	$ 346,625	$ 330,626
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, issued (in shares)	16,100,000	16,100,000
Common stock, outstanding (in shares)	15,900,000	16,000,000
Treasury stock (in shares)	208,343	98,452