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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
CONSOLIDATED BALANCE SHEETS (Unaudited)    
Available-for-sale securities, amortized cost $ 510,597 $ 557,128
Allowance for credit losses $ 40,248 $ 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 3,379,619 3,476,614
Common stock, shares outstanding 3,379,619 3,476,614
Common stock, unvested shares 130,629 145,677