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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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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)

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- Definition The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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