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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Amortized cost $ 2,337,715 $ 3,083,582
Fair Value, Held-to-maturity $ 853,039 $ 2,177
Common stock, par value
Common stock, authorized 225,000,000 225,000,000
Common stock, shares issued 106,384,982 105,893,216
Common stock, shares outstanding 106,384,982 105,893,216