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Employee Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) calendar_year | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution percentage | 6.00% |  |
Amortization of unrecognized net actuarial loss | $ (592) | $ (686) | $ (814)
401(k) Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferral rate | 6.00% |  |
Percent of annual salary employees may contribute | 15.00% |  |
Percent matched by company up to 6 percent of employee salary | 100.00% |  |
Matching contributions | $ 4,300 | 4,300 | 4,200
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Final Average Annual Compensation (five highest consecutive calendar year's earnings out of the last ten years of employment) | 0.75% |  |
Number of highest consecutive calendar years of earnings | calendar_year | 5 |  |
Percentage of Final Average Annual Compensation in excess of average social security wage base | 0.65% |  |
Years of service used for Final Average Annual Compensation in excess of average social security wage base calculation | 35 years |  |
Vesting period | 5 years |  |
Accumulated benefit obligation | $ 41,700 | 44,800 | 41,600
Amortization of unrecognized net actuarial loss | $ (577) | (843) |
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of highest consecutive calendar years of earnings | calendar_year | 5 |  |
Accumulated benefit obligation | $ 4,700 | 6,000 | $ 5,600
Amortization of unrecognized net actuarial loss | $ (15) | $ 157 |
Lifetime monthly pension benefits, percent | 3.00% |  |
Maximum percent of final average compensation | 60.00% |  |
Percent of participant's primary social security benefit | 50.00% |  |
Maximum | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Years of service used for Final Average Annual Compensation calculation | 40 years |  |
Maximum | SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum years of service | 20 years |  |

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