CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Amortized cost	$ 624,272	$ 578,165
Common stock, par value (in usd per share)	$ 1	$ 1
Treasury stock, common shares (in shares)	352,161	352,161
Common stock, shares outstanding (in shares)	27,123,388	26,893,430