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Pension and Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in projected benefit obligation:        
Service cost     $ 415  
Interest cost $ 1,303 $ 1,190 1,314  
Change in plan assets:        
Fair value of plan assets at beginning of year 24,197      
Fair value of plan assets at end of year 27,099 24,197    
Other comprehensive income (loss):        
Amount recognized in accumulated other comprehensive income (loss) - Prior service cost $ (6,429) $ (6,245) $ (5,161) $ (5,083)
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:        
Discount rate 4.05% 3.35% 3.85%  
Pension Benefits [Member]        
Change in projected benefit obligation:        
Projected benefit obligation at beginning of year $ 32,998 $ 36,327 $ 35,012  
Service cost     415  
Interest cost 1,303 1,190 1,314  
Actuarial loss (gain) 3,704 (2,629) 1,787  
Administrative expenses     (402)  
Benefits paid (2,020) (1,890) (1,799)  
Projected benefit obligation at end of year 35,985 32,998 36,327  
Change in plan assets:        
Fair value of plan assets at beginning of year 24,197 26,836 24,063  
Actual return (loss) on plan assets 4,431 (1,388) 3,152  
Employer contribution 491 639 1,822  
Administrative expenses     (402)  
Benefits paid (2,020) (1,890) (1,799)  
Fair value of plan assets at end of year 27,099 24,197 26,836  
Unfunded status (8,886) (8,801) (9,491)  
Defined benefit liability included in other liabilities (8,886) (8,801) (9,491)  
Deferred tax benefit associated with accumulated other comprehensive loss 2,183 2,116 3,153  
Accumulated other comprehensive loss, net of tax 6,420 6,224 5,154  
Other comprehensive income (loss):        
Net loss 527 271 358  
Amortization of net actuarial gain (263) (238) (227)  
Total recognized in other comprehensive income (loss) 264 33 131  
Amount recognized in accumulated other comprehensive income (loss) - Prior service cost $ 8,603 $ 8,340 $ 8,307  
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:        
Discount rate 2.95% 4.05% 3.35%