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Benefit Plans - Defined Benefit Plans - Components of Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Supplemental Retirement Plan    
Components of net periodic benefit cost:    
Service cost $ 492 $ 263
Interest cost 935 1,059
Amortization of prior transition obligation 299  
Amortization of net actuarial loss 387 184
Accelerated benefits for Presidio SERP agreements due to change in control   1,465
Net periodic benefit cost 2,113 2,971
Amount recognized in other comprehensive income 1,924 2,847
Split-Dollar Life Insurance Benefit Plan    
Components of net periodic benefit cost:    
Interest cost 246 278
Amortization of prior transition obligation and actuarial losses (60) (96)
Net periodic benefit cost 186 182
Amount recognized in other comprehensive income $ 1,305 $ 1,113