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Investments, Debt Securities, Amortized Cost and Fair Value by Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	$ 23,352
Due after one year through five years	109,730
Due after five years through ten years	36,649
Due after ten years	63,825
Amortized cost	233,556	$ 242,242
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	23,288
Due after one year through five years	111,676
Due after five years through ten years	37,289
Due after ten years	64,487
Fair value	$ 236,740	$ 241,010

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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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