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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Amortized cost | $ 1,964,251 | $ 2,078,131
Fair Value, Held-to-maturity | $ 747,589 | $ 819,215
Common stock, par value |  |
Common stock, authorized | 225,000,000 | 225,000,000
Common stock, shares issued | 110,302,468 | 110,184,922
Common stock, shares outstanding | 110,302,468 | 110,184,922

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