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Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]    
Net unrealized gain on investment securities available-for-sale $ 2,810 $ 6,855
Related income taxes (984) (2,331)
Net of income taxes 1,826 4,524
Benefit plan adjustments (3,883) (7,525)
Related income taxes 1,359 2,711
Net of income taxes (2,524) (4,814)
Accumulated other comprehensive loss $ (698) $ (290)