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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held to maturity, pledged | $ 1,718,094 | $ 1,930,533 |
Securities held to maturity, fair value | 3,750,049 | 3,813,959 | [1]
Mortgage servicing rights,fair value | 228,800 | 228,099 |
Other real estate owned, covered by loss sharing agreements | $ 17,292 | $ 16,990 |
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 | 488,953,712 | 487,067,889 |
Common stock, shares outstanding | 488,953,712 | 487,056,676 |
Treasury stock, shares |  | 11,213 |
Net unrealized loss on securities available for sale, tax | $ 951 | $ 534 |
Net unrealized loss on the non-credit portion of other-than-temporary impairment losses on securities, tax | 3,338 | 3,351 |
Net unrealized loss on pension and post-retirement obligations, tax | $ 33,483 | $ 34,355 |
[1] | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).

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