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Investments, Debt Securities, Amortized Cost and Fair Value by Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-Sale Debt Securities, Amortized Cost [Abstract]
Due in one year or less	$ 15,308
Due after one year through five years	66,358
Due after five years through ten years	51,976
Due after ten years	131,201
Amortized cost	264,843	$ 237,807
Available-for-Sale Debt Securities, Fair Value [Abstract]
Due in one year or less	15,477
Due after one year through five years	69,524
Due after five years through ten years	53,386
Due after ten years	133,973
Fair value	$ 272,360	$ 240,706

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