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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Consolidated Statements of Condition |  |
Held to maturity, Fair value (in dollars) | $ 2,400 | $ 2,400
Available for sale, Amortized cost (in dollars) | $ 3,631,419 | $ 4,196,263
Common shares, par value (in dollars per share) | $ 1.00 | $ 1.00
Common shares, Authorized shares | 275,000,000 | 275,000,000
Common shares, issued shares | 96,083,354 | 96,019,028
Treasury, shares | 29,940,843 | 29,939,545

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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