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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Available-for-sale, pledged |  | $ 1,263,227 |
Securities held to maturity, pledged |  |  | $ 1,930,533
Securities held to maturity, fair value | [1] |  | 3,813,959
Mortgage servicing rights,fair value |  | 2,729 | $ 228,099
Other real estate owned and other repossessed assets covered by loss sharing agreements |  | $ 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 |  | 489,072,101 | 487,067,889
Common stock, shares outstanding |  | 488,490,352 | 487,056,676
Treasury stock, shares |  | 581,749 | 11,213
Net unrealized (loss) gain on securities available for sale, tax |  | $ (27,961) | $ 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 |  | $ 32,121 | $ 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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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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