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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Amortized cost $ 1,970,076 $ 2,078,131
Fair Value, Held-to-maturity $ 776,130 $ 819,215
Common stock, par value
Common stock, authorized 225,000,000 225,000,000
Common stock, shares issued 110,259,046 110,184,922
Common stock, shares outstanding 110,259,046 110,184,922