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Supplemental Executive Retirement Plan (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) installment age | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2013 USD ($)
Defined benefit plan, net periodic benefit cost | $ 108 | $ 101 |  |
Supplemental Executive Retirement and Death Benefit Agreements |  |  |  |
Time period for calculating base salary under SERP agreements | 5 years |  |  |
Retirement age | age | 67 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 6 years |  |  |
Retirement plan monthly instalments | installment | 180 |  |  |
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements |  |  |  |
Other investments |  |  | $ 2,600 | $ 11,400
Annuity contracts accrued income | $ 40 | $ 32 |  |
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements | Other Assets |  |  |  |
Cash surrender value of life insurance | $ 14,700 |  |  |

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