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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale [Abstract]    
Securities available for sale, amortized cost $ 2,117,597 $ 2,655,594
Held-to-maturity Securities, Other Disclosure Items [Abstract]    
Securities held to maturity, fair value $ 462,621 $ 95,235
Shareholders' equity:    
Common stock, par value (in dollars per share) $ 1.25 $ 1.25
Common stock, shares authorized (in shares) 80,000,000 80,000,000
Common stock, shares issued (in shares) 37,976,640 37,968,969
Treasury stock (in shares) 5,682,651 5,616,917