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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Held to maturity securities, fair value $ 8,981,672 $ 9,382,479
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 94,993,082 95,275,279
Common stock, shares outstanding (in shares) 94,993,082 95,275,279
Accumulated other comprehensive loss net unrealized loss on available for sale securities, tax benefit $ (417) $ (432)