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CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Assets:    
Available-for-sale investment securities, Pledged Amount $ 466,902 $ 485,414
Available-for-sale investment securities, cost 4,675,474 4,980,102
Held-to-maturity securities, fair value 1,034,795 0
Equity and other securities, cost $ 82,424 $ 43,917
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized (in shares) 500,000 500,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares issued (in shares) 54,190,201 54,092,421
Treasury stock, shares at cost (in shares) 452,952 214,374
Shares held by deferred compensation arrangements (in shares) 135,437 146,860