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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Component of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Equity [Abstract]    
Net Unrealized Gains (Losses) on Securities, Beginning Balance $ 1,770 $ 3,166
Net unrealized losses on investment securities (2,693) 327
Reclassification adjustment, Net Unrealized Gains (Losses) on Securities   (1,118)
Net Unrealized Gains (Losses) on Securities, Ending Balance (923) 2,375
Adjustments Related to Pension Benefits, Beginning Balance (2,629) (2,175)
Net unrealized losses on investment securities, Adjustments Related to Pension Benefits      
Reclassification adjustment, Adjustments Related to Pension Benefits     
Adjustments Related to Pension Benefits, Ending Balance (2,629) (2,175)
Accumulated Other Comprehensive Income (Loss), Beginning Balance (859) 991
Net unrealized losses on investment securities, Accumulated Other Comprehensive Income (Loss) (2,693) 327
Reclassification adjustment, Accumulated Other Comprehensive Income (Loss)   (1,118)
Accumulated Other Comprehensive Income (Loss), Ending Balance $ (3,552) $ 200