CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Amortized cost	$ 646,728	$ 578,165
Common stock, par value (in usd per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	51,500,000	51,500,000
Common stock, shares issued (in shares)	27,482,573	27,245,591
Common stock, shares outstanding (in shares)	27,130,412	26,893,430
Subsidiary, Sale of Stock [Line Items]
Treasury stock, common shares (in shares)	352,161	352,161
Subsidiaries
Subsidiary, Sale of Stock [Line Items]
Treasury stock, common shares (in shares)	145,820	145,820