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Nature of Operations (Details) $ in Thousands	12 Months Ended
Nature of Operations (Details) $ in Thousands	Dec. 31, 2017 USD ($) segment
Number of Reportable Segments \| segment	1
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets \| $	$ 434

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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