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Employee Benefit Plans - Schedule of Reconciliation of Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation      
Service cost $ 0 $ 0 $ 0
Change in plan assets      
Plan assets at beginning of year 43,824    
Plan assets at end of year 48,167 43,824  
Pension Plan      
Change in benefit obligation      
Benefit obligation at beginning of year 41,592 36,354 38,150
Service cost 0 0 0
Interest cost 1,223 1,482 1,312
Actuarial loss (gain) 3,788 5,492 (1,160)
Benefits paid (1,853) (1,736) (1,948)
Benefit obligation at end of year 44,750 41,592 36,354
Change in plan assets      
Plan assets at beginning of year 43,824 39,170 41,306
Actual return on plan assets 6,196 6,390 (188)
Employer contributions 0 0 0
Benefits paid (1,853) (1,736) (1,948)
Plan assets at end of year 48,167 43,824 39,170
Funded status at end of year 3,417 2,232 2,816
SERP      
Change in benefit obligation      
Benefit obligation at beginning of year 5,638 5,794 5,970
Service cost 0 0 124
Interest cost 158 219 200
Actuarial loss (gain) 517 23 (102)
Benefits paid (331) (398)  
Benefit obligation at end of year 5,982 5,638 5,794
Change in plan assets      
Plan assets at beginning of year 0 0  
Benefits paid (331) (398) (398)
Plan assets at end of year 0 0 0
Funded status at end of year $ (5,982) $ (5,638) $ (5,794)