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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Amortized cost $ 1,549,406 $ 1,757,666
Fair Value, Held-to-maturity $ 711,891 $ 721,537
Common stock, par value
Common stock, authorized 225,000,000 225,000,000
Common stock, shares issued 140,157,063 140,000,017
Common stock, shares outstanding 140,157,063 140,000,017