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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement of Financial Position [Abstract] |  |  |
Securities Available-for-sale, pledged | $ 1,242,310 | $ 1,278,177 | $ 1,372,238
Debt Securities, allowance for credit losses | $ 0 | $ 0 |
Preferred stock, par | $ 0.01 | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 5,000,000
Preferred stock, Series A shares issued | 515,000 | 515,000 | 515,000
Preferred stock, Series A shares outstanding | 515,000 | 515,000 | 515,000
Common stock, par | $ 0.01 | $ 0.01 | $ 0.01
Common stock, shares authorized | 900,000,000 | 900,000,000 | 900,000,000
Common stock, shares issued | 490,439,070 | 490,439,070 | 490,439,070
Common stock, shares outstanding | 465,074,384 | 463,901,808 | 467,346,781
Treasury stock, shares | 25,364,686 | 26,537,262 | 23,092,289
Net unrealized gain (loss) on securities available for sale, tax | $ 16,051 | $ (25,072) | $ (9,424)
Net unrealized loss on pension and post-retirement obligations, tax | 20,198 | 21,898 | 22,191
Cash flow hedges tax component | $ 9,658 | $ 12,519 | $ (333)

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