CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CONSOLIDATED BALANCE SHEETS
Available-for-sale securities, amortized cost	$ 494,092	$ 557,128
Allowance for credit losses	$ 39,651	$ 40,518
Common stock par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	3,374,098	3,476,614
Common stock, shares outstanding	3,374,098	3,476,614
Common stock, unvested shares	135,694	145,677