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Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 01, 2000
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Number of highest-paid consecutive years for benefits   5 years  
Percentage of first employee compensation for which company makes matching contribution   1.00%  
Company contribution on employee specific contribution   50.00%  
Number of hours in service required for the contribution to be allocated   1000 hours  
Minimum eligibility for employees under 401(k) Plan, age   19 years  
Number of plan service years after which employer matching contribution vest   2 years  
Expense attributable to the Plan amounted   $ 482,000 $ 451,000
Percentage of vested participants 100.00%    
Participants years of credited service 2 years    
Compensation expense for ESOP   $ 0 $ 0
Shares of the Company held by the ESOP   247,283 208,168
Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of employee for which company makes specified contribution   2.00%  
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of employee for which company makes specified contribution   6.00%  
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Minimum eligibility for full-time employees, age   21 years  
Effective discount rate   25.00%  
Amount contributed to pension plan   $ 0 $ 0
Amount contributed to pension plan, Expected in future   2,100,000  
Amount of accumulated benefit obligation for the defined benefit pension plan   $ 5,800,000 $ 5,600,000
Defined Benefit Pension Plan [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Period of service credit by employee   1 year