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CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Available-for-sale investment securities, pledged amount $ 598,873 $ 466,902
Amortized Cost 3,301,607 4,675,474
Held-to-maturity securities 1,121,816 1,034,795
Amortized cost $ 72,275 $ 82,424
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized 500,000 500,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 54,372,292 54,190,201
Treasury stock, shares at cost 1,045,232 452,952
Shares held by deferred compensation arrangements 120,556 135,437