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Employee Benefit Plans - Narrative (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
pensionPlan
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Defined Contribution Plan Disclosure [Line Items]      
Number of non-contributory defined-contribution retirement plans | pensionPlan 2    
Number of shares issued | shares 14,964,389 15,014,499  
Fair value of shares issued $ 1,496,000 $ 1,501,000  
Expenses related to defined-contribution plans 4,400,000 4,000,000.0 $ 3,900,000
Actuarial loss (gain) $ 15,500,000 $ 18,300,000  
Expected long-term rate of return 6.75% 7.00% 7.25%
Compensation expense related to the profit-sharing $ 4,500,000 $ 4,400,000 $ 4,900,000
Maximum match (as a percent) 4.00%    
Expense associated with matching provisions $ 2,900,000 2,900,000 $ 2,600,000
Life insurance assets $ 84,736,000 $ 82,961,000  
DB Pension Plan      
Defined Contribution Plan Disclosure [Line Items]      
Number of shares issued | shares 0 42,192  
Fair value of shares issued   $ 3,800,000  
Accumulated benefit obligation $ 98,000,000.0 90,300,000  
Unfunded status 8,849,000 7,994,000  
Actuarial loss (gain) $ 10,046,000 10,996,000  
DC Retirement Plan      
Defined Contribution Plan Disclosure [Line Items]      
Requisite service period 1 year    
Annual contribution limit (as a percent) 4.00%    
Accumulated benefit obligation $ 10,500,000 9,000,000.0  
Unfunded status 10,508,000 9,022,000  
Actuarial loss (gain) 1,340,000 1,218,000  
SERP Plan      
Defined Contribution Plan Disclosure [Line Items]      
Accumulated benefit obligation 27,400,000 23,200,000  
Unfunded status 36,710,000 32,153,000  
Actuarial loss (gain) 4,070,000 6,128,000  
Split dollar life insurance benefits      
Defined Contribution Plan Disclosure [Line Items]      
Estimated liability 1,700,000 1,600,000  
Compensation expense related to the split dollar life insurance $ 55,122 $ 49,801