Pension and Retirement Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension highest consecutive plan period			5 years	3 years
Defined contribution plan, employer matching contribution, percent				10.00%
Transfers between fair value levels	$ 0	$ 0
Minimum | Domestic Large Cap Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	30.00%
Minimum | Domestic Small/Mid Cap Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	5.00%
Minimum | International Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	0.00%
Minimum | Cash and Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	20.00%
Maximum | Domestic Large Cap Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	60.00%
Maximum | Domestic Small/Mid Cap Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	20.00%
Maximum | International Equities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	20.00%
Maximum | Cash and Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentages	50.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, description			The Company has a noncontributory, defined benefit pension plan (“Pension Plan”) covering substantially all employees hired before May 2, 2011. Employees in positions requiring at least 1,000 hours of service per year were eligible to participate upon the attainment of age 21 and the completion of 12 months of service. Benefits are based primarily on years of service and the employee’s average monthly pay during the five highest consecutive plan years of the employee’s final ten years. On October 23, 2017, the Company announced its decision to freeze the accrual of benefits within the Pension Plan, effective December 31, 2017. The Company also provides supplemental retirement benefits to certain current and former executive officers of the Company under the terms of Supplemental Executive Retirement Agreements (“Supplemental Retirement Plan”).
Minimum number of hours of service per year required for eligibility			1000 hours
Employee eligibility age under the plan			21 years
Minimum number of years of service required for eligibility			12 months
Long-term rate of return on asset assumption	6.50%	6.50%
Contributions to pension plan	$ 0
Supplemental Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension highest consecutive plan period				3 years
Defined contribution plan, employer matching contribution, percent				10.00%
Contributions to pension plan	610,000	$ 538,000
Postretirement Medical Coverage
Defined Benefit Plan Disclosure [Line Items]
Employee eligibility age under the plan			65 years
Contributions to pension plan	$ 35,000	$ 33,000
Profit Sharing Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum employee contribution, percent		100.00%
Defined contribution plan, employer matching contribution, percent		4.00%	3.00%
Defined contribution plan, minimum number of hours of service per year required for eligibility		1000 hours
Defined contribution plan, minimum service period required for eligibility		12 months
Profit Sharing Plan | 401(k)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum employee contribution, percent		100.00%
Profit Sharing Plan | Discretionary Contribution
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, minimum number of hours of service per year required for eligibility		1000 hours
Defined contribution plan, minimum service period required for eligibility		12 months
Normal retirement age of employees		65 years
Profit Sharing Plan | Minimum | 401(k)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent			3.00%
Profit Sharing Plan | Maximum | 401(k)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent		4.00%
Employee Stock Ownership Plan (ESOP)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, minimum number of hours of service per year required for eligibility	1000 hours
Defined contribution plan, minimum service period required for eligibility	12 months
Employee Stock Ownership Plan (ESOP) | Minimum
Defined Benefit Plan Disclosure [Line Items]
Employee eligibility age under the plan	21 years
Profit Sharing and ESOP Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution expense related to plans	$ 2,800,000	$ 2,600,000	$ 1.5
'Defined Contribution SERP Plan (“DC SERP”)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent	10.00%
Contribution expense related to plans	$ 167,000	$ 209,000	$ 126,000