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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Debt securities available-for-sale at amortized cost $ 1,132,569 $ 1,186,649
Shareholders' equity:    
Preferred stock, shares authorized (in shares) 300,000 300,000
Common stock, par value (in dollars per share) $ 5 $ 5
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 18,110,333 18,057,923
Common stock, shares outstanding (in shares) 18,110,333 18,057,923