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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Investment securities:    
Securities held to maturity, fair value (in dollars) $ 2,630,495 $ 1,778,064
Shareholders' equity:    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, shares authorized 160,000,000 160,000,000
Common stock, shares issued 75,761,018 69,332,297
Common stock, shares outstanding 75,761,018 69,332,297