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Benefit Plans - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2000
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]        
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   $ 249,000 $ 219,000 $ 200,000
Percentage of vested participants 100.00%      
Participants years of credited service 2 years      
Compensation expense for ESOP   0 0 0
Shares of the Company held by the ESOP   169,882 134,609 65,633
Recorded gain from termination of post retirement benefit liability   543,000    
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 Postretirement Life Insurance [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Related effect on net income recognized expense (benefit)     21,000 104,000
Pension Plans, Defined Benefit [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Minimum eligibility for full-time employees, age   21 years    
Period of service credit by employee   1 year    
Effective discount rate   0.25%    
Amount contributed to pension plan   500,000 306,000 240,000
Amount contributed to pension plan, Expected in future   0    
Amount of accumulated benefit obligation for the defined benefit pension plan   $ 3,800,000 $ 5,100,000 $ 4,200,000
Pension Plans, Defined Benefit [Member] | Fixed Income Funds [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Targeted asset allocation on fixed income   40.00%    
Pension Plans, Defined Benefit [Member] | Equity Funds [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Targeted asset allocation on fixed income   60.00%