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Benefit Plans - Benefit Obligation and Plan Asset Rollforward (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 33,058 $ 28,878 $ 31,970
Service cost 0 0 0
Interest cost 1,000 1,198 1,094
Actuarial loss 381 63 0
Benefits paid (1,630) (1,493) (1,401)
Change in actuarial assumptions 2,361 4,412 (2,785)
Benefit obligation at end of year 35,170 33,058 28,878
Change in plan assets:      
Fair value of plan assets at beginning of year 49,932 43,449 46,870
Actual return on plan assets 6,315 7,976 (2,020)
Employer contributions 0 0 0
Benefits paid (1,630) (1,493) (1,401)
Fair value of plan assets at end of year 54,617 49,932 43,449
Funded status at end of year 19,447 16,874 14,571
Post-retirement      
Change in benefit obligation:      
Benefit obligation at beginning of year 23,323 20,028 22,757
Service cost 78 80 115
Interest cost 712 837 786
Actuarial loss (169) 0 18
Benefits paid (627) (600) (590)
Change in actuarial assumptions (4,512) 2,978 (3,058)
Benefit obligation at end of year 18,805 23,323 20,028
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0 0
Actual return on plan assets 0 0 0
Employer contributions 627 600 590
Benefits paid (627) (600) (590)
Fair value of plan assets at end of year 0 0 0
Funded status at end of year $ (18,805) $ (23,323) $ (20,028)