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Employee Benefits - Certain Information Regarding Health and Welfare Plan (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in Plan Assets:      
Fair value of assets at end of year $ 261,030    
Post-Retirement Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 11,898 $ 13,583  
Interest cost 327 512 $ 513
Actuarial gain 238 (1,233)  
Premiums and claims paid (614) (964)  
Benefit obligation at end of year 11,849 11,898 $ 13,583
Change in Plan Assets:      
Employer contribution 614 964  
Premiums and claims paid (614) (964)  
Funded status (included in “Other liabilities”) (11,849) (11,898)  
Changes recognized in other comprehensive income for the year ended December 31:      
Amortization of prior service cost 249 249  
Amortization of actuarial gain (25) (124)  
Net actuarial (gain) loss arising during the year 238 (1,234)  
Total recognized in other comprehensive income for the year (pre-tax) 462 (1,109)  
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:      
Prior service cost (287) (536)  
Actuarial loss, net 1,679 1,466  
Total accumulated other comprehensive loss (pre-tax) $ 1,392 $ 930