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Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Jan. 01, 2018
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
ROU assets | $ 4,309 | $ 4,500 |
Total lease liabilities | $ 4,092 | 4,300 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings |  | 233 | $ 0
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings |  | $ 233 | $ (59)

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