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Employee Benefit Plans - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
pension_plan
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Defined Contribution Plan Disclosure [Line Items]      
Number of non-contributory defined-contribution retirement plans | pension_plan 2    
Number of shares issued | shares 15,014,499 15,348,287  
Fair value of shares issued $ 1,501,000 $ 1,535,000  
Expenses related to defined-contribution plans 4,000,000.0 3,900,000 $ 4,100,000
Compensation expense related to the profit-sharing $ 4,400,000 4,900,000 5,800,000
Maximum match (as a percent) 4.00%    
Expense associated with matching provisions $ 2,900,000 2,600,000 $ 2,500,000
Life insurance assets $ 82,961,000 $ 81,928,000  
DB Pension Plans      
Defined Contribution Plan Disclosure [Line Items]      
Number of shares issued | shares 41,292 42,192  
Fair value of shares issued $ 3,800,000 $ 3,200,000  
Accumulated benefit obligation 90,300,000 79,700,000  
Unfunded status 7,994,000 $ 7,215,000  
Increase in service and interest costs 594,000    
Increase in benefit obligation amount 20,000    
Decrease in service and interest costs 526,000    
Decrease in benefit obligation, amount $ 18,000    
Expected long-term rate of return 7.00% 7.25% 7.25%
DB Pension Plans | Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Rate of compensation increase (as a percent) 5.90%    
DB Pension Plans | Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Rate of compensation increase (as a percent) 4.50%    
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 $ 9,000,000.0 $ 7,900,000  
Unfunded status $ 9,022,000 $ 7,857,000  
Rate of compensation increase (as a percent) 4.00% 4.00% 5.00%
SERP Plan      
Defined Contribution Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 32,200,000 $ 23,500,000  
Unfunded status $ 32,153,000 $ 23,539,000  
Rate of compensation increase (as a percent) 5.00% 5.00% 5.00%
Split dollar life insurance benefits      
Defined Contribution Plan Disclosure [Line Items]      
Estimated liability $ 1,600,000 $ 1,500,000  
Compensation expense related to the split dollar life insurance $ 49,801 $ 52,000