CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Amortized cost	$ 620,806	$ 631,294
Common stock, par value (in usd per share)	$ 1	$ 1
Treasury stock (in shares)	352,161	352,161
Common stock, shares outstanding (in shares)	27,580,535	27,370,227