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Supplemental Executive Retirement Plan (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) installment age | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) insuranceCarrier | Dec. 31, 2013 USD ($) insuranceCarrier
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, net periodic benefit cost | $ 338 | $ 428 | $ 404 |
Annuity contract financed payments period (in years) | 15 years |  |  |
Supplemental Executive Retirement and Death Benefit Agreements |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Time period for calculating base salary under SERP agreements (in years) | 5 years |  |  |
Retirement age (in years) | age | 67 |  |  |
Award vesting period (in years) | 6 years |  |  |
Retirement plan monthly instalments | installment | 180 |  |  |
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of insurance carriers | insuranceCarrier |  |  | 2 | 4
Other investments |  |  | $ 2,600 | $ 11,400
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements | Other Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cash surrender value of life insurance | $ 14,200 | $ 14,500 |  |

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