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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Consolidated Balance Sheets [Abstract] |  |
Securities available for sale, amortized cost | $ 2,116,271 | $ 2,086,745
Securities held to maturity, fair value | 2,566,799 | 2,375,851
Property and equipment, accumulated depreciation | $ 216,418 | $ 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 | 77,507,960 | 77,496,429
Treasury shares at cost, shares | 9,307,551 | 9,319,082

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