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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Amortized cost $ 2,078,131 $ 2,255,874
Fair Value, Held-to-maturity $ 819,215 $ 897,374
Common stock, par value
Common stock, authorized 225,000,000 225,000,000
Common stock, shares issued 110,184,922 108,251,981
Common stock, shares outstanding 110,184,922 108,251,981