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Consolidated Statements of Condition (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Securities Available-for-sale, pledged $ 1,278,177 $ 1,372,238
Preferred stock, par $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, Series A shares issued 515,000 515,000
Preferred stock, Series A shares outstanding 515,000 515,000
Common stock, par $ 0.01 $ 0.01
Common stock, shares authorized 900,000,000 900,000,000
Common stock, shares issued 490,439,070 490,439,070
Common stock, shares outstanding 463,901,808 467,346,781
Treasury stock, shares 26,537,262 23,092,289
Net unrealized gain (loss) on securities available for sale, tax $ (25,072) $ (9,424)
Net unrealized loss on pension and post-retirement obligations, tax 21,898 22,191
Cash flow hedges tax component $ 12,519 $ (333)