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Employee Benefits (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Employer matching contribution percentage | 50.00% |  |
Employee percentage of match | 6.00% |  |
Minimum match | $ 1,500 |  |
Employee benefit expenses | $ 2,688,000 | $ 2,606,000 | $ 2,360,000

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