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Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Executive Retirement Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 135 $ 153 $ 161
Interest cost 246 203 224
Amortization of gains (losses) 49 45  
Amortization of prior service cost 187 134 134
Net periodic cost 617 535 519
Directors Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 26 27 29
Interest cost 41 39 43
Amortization of gains (losses) 1    
Amortization of prior service cost 90 90 90
Net periodic cost $ 158 $ 156 $ 162