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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Face amount per share of no-par value common stock.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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