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Retirement Plans - Pension Plan Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation:      
Benefit obligation at beginning of year $ 0    
Benefit obligation at end of year $ 0 $ 0  
Non-contributory defined benefit pension plan      
Change in benefit obligation:      
Benefit obligation at beginning of year   28,906 $ 31,500
Service cost   121 77
Interest cost   1,158 1,080
Actuarial (gain) loss   2,471 (2,442)
Expenses   318 121
Plan termination settlements   (31,800)  
Benefit obligation at end of year     28,906
Change in plan assets:      
Fair value of plan assets at beginning of year   30,545 31,387
Actual return on plan assets   2,111 467
Benefits paid   (538) (1,188)
Expenses   318 121
Plan termination settlements   $ (31,800)  
Fair value of plan assets at end of year     30,545
Funded (unfunded) status     $ 1,639