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Benefit Plans - Defined Benefit Plans - Change in Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Split-Dollar Life Insurance Benefit Plan    
Change in projected benefit obligation:    
Projected benefit obligation at beginning of year $ 8,198 $ 6,903
Interest cost 246 278
Actuarial loss (gain) 1,245 1,017
Projected benefit obligation at end of period 9,689 8,198
Supplemental Retirement Plan    
Change in projected benefit obligation:    
Projected benefit obligation at beginning of year 33,689 26,781
Projected benefit obligation of SERP agreements acquired from Presidio   2,541
Service cost 492 263
Interest cost 935 1,059
Actuarial loss (gain) (3,008) (4,182)
Benefits paid (3,118) (1,137)
Plan amendment 398  
Projected benefit obligation at end of period $ 35,404 $ 33,689