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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities Available-for-sale, pledged | $ 1,228,702 | $ 1,263,227
Mortgage servicing rights,fair value |  | $ 2,729
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 | 489,072,101
Common stock, shares outstanding | 473,536,604 | 488,490,352
Treasury stock, shares | 16,902,466 | 581,749
Net unrealized (loss) gain on securities available for sale, tax | $ 4,201 | $ (27,961)
Net unrealized loss on the non-credit portion of other-than-temporary impairment losses on securities, tax | 2,517 | 3,338
Net unrealized loss on pension and post-retirement obligations, tax | $ 27,224 | $ 32,121

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