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Consolidated Statements of Condition (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Securities Available-for-sale, pledged $ 1,242,310 $ 1,278,177
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 465,074,384 463,901,808
Treasury stock, shares 25,364,686 26,537,262
Net unrealized (loss) gain on securities available for sale, tax $ 16,051 $ (25,072)
Net unrealized loss on pension and post-retirement obligations, tax 20,198 21,898
Cash flow hedges tax component 9,658 12,519
Debt Securities, allowance for credit losses $ 0 $ 0