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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Consolidated Balance Sheets [Abstract] |  |
Securities available for sale, amortized cost | $ 2,261,278 | $ 2,086,745
Securities held to maturity, fair value | 2,569,084 | 2,375,851
Property and equipment, accumulated depreciation | $ 223,046 | $ 209,763
Common stock, par value per share | $ 3.33 | $ 3.33
Common stock, shares authorized | 350,000,000 | 350,000,000
Common stock, shares outstanding | 77,538,260 | 77,496,429
Treasury shares at cost, shares | 9,277,251 | 9,319,082

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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