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Summary of Significant Accounting Policies New Accounting Pronouncement (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 0 |  |
Operating Lease, Right-of-Use Asset | 4,484,000 | $ 4,490,000 | $ 0
Operating Lease, Liability | 4,423,000 | $ 4,428,000 |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ (162,000) |  |

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