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Supplemental Executive Retirement Plan (Details Narrative) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) Number | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Number | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2013 USD ($)
Defined benefit plan, net periodic benefit cost | $ 100 | $ 103 | $ 586 | $ 308 |  |
Supplemental Executive Retirement and Death Benefit Agreements [Member] |  |  |  |  |  |
Time period for calculating base salary under SERP agreements |  |  | 5 years |  |  |
Retirement age | Number | 67 |  | 67 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 6 years |  |  |
Retirement plan monthly instalments | Number | 180 |  | 180 |  |  |
Purchased Fixed Annuity for Financing Retirement Benefits [Member] | Supplemental Executive Retirement and Death Benefit Agreements [Member] |  |  |  |  |  |
Other investments |  |  |  |  |  | $ 11,400
Annual fee on annuity contracts | $ 56 |  |  |  |  |
Annuity contracts accrued income | 54 |  |  |  |  |
Purchased Fixed Annuity for Financing Retirement Benefits [Member] | Supplemental Executive Retirement and Death Benefit Agreements [Member] | Other Assets [Member] |  |  |  |  |  |
Cash surrender value of life insurance | $ 12,400 |  | $ 12,400 |  | $ 11,600 |

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