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Employee Benefit Plans - Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DB Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 79,689 $ 82,748  
Service cost 0 0 $ 0
Interest cost 2,936 2,508 2,501
Plan participants’ contributions 0 0  
Amendments 0 0  
Actuarial loss (gain) 10,996 (2,324)  
Benefits paid (3,275) (3,243)  
Benefit obligation at end of year 90,346 79,689 82,748
Change in plan assets:      
Fair value of plan assets at beginning of year 72,474 80,154  
Actual return on plan assets 13,153 (4,437)  
Plan participants’ contributions 0 0  
Employer contributions 0 0  
Benefits paid (3,275) (3,243)  
Fair value of plan assets at end of year 82,352 72,474 80,154
Unfunded status (7,994) (7,215)  
Life and Healthcare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 7,857 8,995  
Service cost 159 212 192
Interest cost 289 270 268
Plan participants’ contributions 87 122  
Amendments (203) 0  
Actuarial loss (gain) 1,218 (1,337)  
Benefits paid (385) (405)  
Benefit obligation at end of year 9,022 7,857 8,995
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 87 122  
Employer contributions 298 283  
Benefits paid (385) (405)  
Fair value of plan assets at end of year 0 0 0
Unfunded status (9,022) (7,857)  
SERP Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 23,539 26,142  
Service cost 157 160 166
Interest cost 909 833 852
Plan participants’ contributions 0 0  
Amendments 2,022 0  
Actuarial loss (gain) 6,128 (2,987)  
Benefits paid (602) (609)  
Benefit obligation at end of year 32,153 23,539 26,142
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 0 0  
Employer contributions 602 609  
Benefits paid (602) (609)  
Fair value of plan assets at end of year 0 0 $ 0
Unfunded status $ (32,153) $ (23,539)