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Retirement Plans - Information about Pension Plan (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation:      
Beginning benefit obligation $ 15,570,000 $ 13,338,000  
Service cost     $ 0
Interest cost 484,000 479,000 627,000
Actuarial (gain)/loss 1,898,000 3,546,000  
Benefits paid (1,296,000) (1,793,000)  
Ending benefit obligation 16,656,000 15,570,000 13,338,000
Change in plan assets, at fair value:      
Beginning plan assets 15,183,000 15,572,000  
Actual return 1,370,000 1,404,000  
Employer contribution 0 0  
Benefits paid (1,296,000) (1,793,000)  
Ending plan assets 15,257,000 15,183,000 $ 15,572,000
Funded status at end of year $ (1,399,000) $ (387,000)