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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Held to maturity securities, fair value $ 10,478,359 $ 10,984,598
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
Common stock, shares issued (in shares) 93,525,291 93,722,383
Common stock, shares outstanding (in shares) 93,525,291 93,722,383
Accumulated other comprehensive loss net unrealized loss on available for sale securities, tax benefit $ (620) $ (372)