Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Status of Supplemental Executive Retirement Plan (Detail)

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Employee Benefit Plans - Status of Supplemental Executive Retirement Plan (Detail) (Supplemental Employee Retirement Plans, Defined Benefit [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Supplemental Employee Retirement Plans, Defined Benefit [Member]
   
Change in projected benefit obligation:    
Obligation at beginning of year $ 4,411 $ 2,392
Service cost 1,967 1,638
Interest cost 169 105
Actuarial loss (gain) (1,191) 276
Benefits paid (93)  
Obligation at end of year 5,263 4,411
Accumulated benefit obligation 4,089 3,420
Change in fair value of plan assets:    
Plan assets at beginning of year      
Employer contributions 93  
Benefits paid (93)  
Plan assets at end of year      
Funded status recognized $ (5,263) $ (4,411)