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Employee and Retiree Benefit Plans
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Employee and Retiree Benefit Plans Employee and Retiree Benefit Plans
 
THRIFT PLAN – Most full-time employees of the Company may participate in defined contribution savings plans by contributing up to a specified percentage of their base pay.  The Company matches contributions at 100% of each employee’s contribution with a maximum match of 6%.  In addition, the Company makes profit sharing contributions on an annual basis.  Eligible employees receive a stated percentage of their base and incentive pay of 5%, 7%, or 9% determined on a formula that is based on a combination of age and years of service.  The Company’s combined expenses related to this plan were $15.3 million in 2020, $12.9 million in 2019 and $9.7 million in 2018. 

PROFIT SHARING PLAN – Eligible part-time employees may participate in the Company’s noncontributory profit sharing plan.  Each year, the Company may make a discretionary employer contribution in an amount determined and authorized at the discretion of the Board of Directors.  Eligible employees receive an allocation based on their compensation earned for the year the contribution is allocated.  The Company’s expenses related to this plan were $1.8 million in 2020, $1.5 million in 2019 and $(0.8) million in 2018. 
SUPPLEMENTAL EXECUTIVE RETIREMENT – The Company provides a Supplemental Executive Retirement Plan ('SERP'), a nonqualified deferred compensation plan, to eligible executives and certain members of management. The SERP plan is intended to restore qualified defined contribution plan benefits restricted under the Internal Revenue Code of 1986 to certain highly-compensated individuals. The liability balances, net of associated assets, were $3.7 million and $2.1 million, at December 31, 2020 and 2019, respectfully.