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CONSOLIDATED STATEMENTS OF CONDITION (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Assets:    
Available-for-sale investment securities, pledged amount $ 344,813 $ 598,873
Amortized Cost 3,241,610 3,301,607
Held-to-maturity securities $ 1,167,755 $ 1,121,816
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 54,549,390 54,372,292
Treasury stock, shares at cost 2,026,587 1,045,232
Shares held by deferred compensation arrangements 101,911 120,556