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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Amortized cost	$ 1,718,357	$ 1,757,666
Fair Value, Held-to-maturity	$ 678,948	$ 721,537
Common stock, par value	$ 0	$ 0
Common stock, authorized	225,000,000	225,000,000
Common stock, shares issued	140,102,480	140,000,017
Common stock, shares outstanding	140,102,480	140,000,017

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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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